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• Ubuntu's garbage collection cron job for PHP sessions takes 25 minutes to run, why?

  - by Lamah

  Ubuntu has a cron job set up which looks for and deletes old PHP sessions: # Look for and purge old sessions every 30 minutes 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] \ && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 \ -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir \ fuser -s {} 2> /dev/null \; -delete My problem is that this process is taking a very long time to run, with lots of disk IO. Here's my CPU usage graph: The cleanup running is represented by the teal spikes. At the beginning of the period, PHP's cleanup jobs were scheduled at the default 09 and 39 minutes times. At 15:00 I removed the 39 minute time from cron, so a cleanup job twice the size runs half as often (you can see the peaks get twice as wide and half as frequent). Here are the corresponding graphs for IO time: And disk operations: At the peak where there were about 14,000 sessions active, the cleanup can be seen to run for a full 25 minutes, apparently using 100% of one core of the CPU and what seems to be 100% of the disk IO for the entire period. Why is it so resource intensive? An ls of the session directory /var/lib/php5 takes just a fraction of a second. So why does it take a full 25 minutes to trim old sessions? Is there anything I can do to speed this up? The filesystem for this device is currently ext4, running on Ubuntu Precise 12.04 64-bit. EDIT: I suspect that the load is due to the unusual process "fuser" (since I expect a simple rm to be a damn sight faster than the performance I'm seeing). I'm going to remove the use of fuser and see what happens.

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• Allied Telesis router: IP filtering for the LOCAL interface

  - by syneticon-dj

  Given an Allied Telesis router with an AlliedWare OS (2.9.1) I would like to disable access to all management services of the router except for a number of subnets (or alternatively have what is a "management VLAN" with other manufacturers' switch and router models). What I have tried so far: creating a new VLAN and an appropriate IP interface, setting the LOCAL IP into this subnet, creating an IP filter for the IP interface and specifying my exclusion subnets: it simply does not work as intended as I can access the LOCAL IP set from any of the other VLAN interfaces - the traffic is apparently not going through my defined filter set at all creating a new IP filter set and binding it to the LOCAL IP interface: this seems not to affect any kind of traffic at all, the counters for the filter set remain at zero packets setting the Remote Security Officer Level IP address range: this only restricts the ability for a user with the Security Officer privilege level to log in from any but the specified address ranges / subnets. Unfortunately, it does not prevent service availability (and thus DoS capacity) or the ability to log in as a less privileged user (e.g. a "manager") calling technical support: unfortunately no solution so far What I have not tried: creating a filter set for each and every IP interface defined on the router and excluding access to the router's management IP: I would like to reduce the overhead induced by IP filters as the router already is CPU-constrained at times. Setting up filters for every IP interface would mean that each and every traffic packet would have to pass the filters, thus consuming CPU cycles. If by any means possible, I would like to find a different solution.

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• FDE / SSD - partition and leave some unencrypted?

  - by Web Design Hero

  Just bought a used beast of a desktop pc. The system drive is setup as a Raid 0 SSD (Intel 510 SSD Drives) with 128 each. I will probably not have to many programs beyond office and maybe Adobe CS if I spring for it, I will be keeping big data on a regular hdd. My question is about setting up TrueCrypt with my configuration. I have not previously done full disk encryption, but I feel that its probably a good idea. I have done some speed tests using file containers on the hdd and the sdd with truecrypt. While there is a huge hit with the SSDs and Truecrypt, it still outperforms the hdd on its own by a good margin, so I think i will be okay for my needs with truecrypt. I have seen in a few places that they recommend partitioning the drive and leavign some of the SSD not inside truecrypt, does this really make a difference? If so, how much should I leave? Will there be any issue in the Raid0 configuration? I am not really concerned about all the wear leveling issue, rather loose data and be secure, but since I don't need all that space neccesarily, I would like to optimize my setup for security and speed.

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• Server specification recommendation

  - by foo

  To cut the story short, I can't buy an item (server/cpu/motherboard/ram) that costs more than USD 330. However, I can combine them, meaning, I can buy a CPU that costs USD 330 and motherboard that costs USD 330. With this limitation, I can't buy a powerful 1U server which will definitely costs me more USD 330. With that in mind, I was hoping to build a powerful desktop PC which will be used as a database server. However, through my experience, desktop PC doesn't last very long, usually the motherboard will just die by itself after 1 or 2 years. So, what would you guys recommend me to buy with this kind of budget? Every item must be <= USD 330. Will be used as a MySQL server. RAID would be nice. 1TB is pretty big for my data. I do not need external graphic card (onboard would do just fine), mouse, keyboard, monitor. Linux friendly. One ethernet port is good enough. It's important that those hardware is made of components that will last long (at least 3 years or something). The server will be placed in an air conditioned room, but a good ventilation for the server is always preferred. I won't overclock it. Intel processor is preferred. Thanks in advance.

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• What method of MySQL mirroring should I use for this?

  - by user45745

  I'm running an web application hosting service (basically hosting forums for free), and I have two remote servers at my disposal. The code for the application is stored on both servers and isn't a problem, but I'm wondering how to deal with the databases. When someone goes onto a site *.example-host.com, they are sent to one of the two servers and both must be capable of loading the forums from a database. The database must also have write access, for when new members register or post topics etc. The main requirement is speed, but uptime is also important (if a server goes out, the site should still work). I have a few options, but I'm inexperienced and not sure which to go with: 1) [PHP] Split the forum records 50:50 between the two servers. If a server does not have the record for a forum requested, it can request it from the other by remote MySQL and load it. This idea sounded okay, until I realised that 50% of the time, users would be waiting significantly longer for pages to load. I also realised that if one of the servers went down, half the forums would be inaccessible and registrations would have to be disabled. 2) [MySQL] Dual master replication. This would attempt to mirror the two databases and sounds perfect, but I've heard that it can be very problematic. I don't know how fast this is. 3) [MySQL] Use a standard replication, distribute read only queries on both nodes and read/write queries to the master. This sounds like a good option, but again, I'm not sure on speed. I also don't know what would happen if the master server went down. If you have any other suggestions, please post them :)

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• Eee PC 1015BX ram compatibility?

  - by AdrianaMX

  Asus Eee PC 1015BX Operating System Windows 7 Starter, 32bit CPU AMD Fusion APU C60 1.0GHz (dual core) Processor Graphic AMD Radeon HD 6290 (256 MB Shared) Memory DDR3, 1 x SO-DIMM, 1GB I have upgraded the preloaded "Windows 7 Starter" to "Windows 7 Professional" I want to upgrade the ram, from 1gb (factory) to 4 gb. What should i buy? SODDR3, 4GB, 1066MHZ, PC3-8500, 204PIN? or SODDR3, 4GB, 1333MHZ, PC3-10666, 204PIN? I already know that Windows 7 32-bits can't handle 4gb, only 3gb (but 3gb is better than one stick of 2gb). ASUS send me this link, but i think they are wrong, (or Insufficient Information for me) http://www.kingston.com/us/memory/search/Default.aspx?DeviceType=3&Mfr=ASU&Line=Eee%20PC&Model=71404 Thank you. CPU-Z Chipset Memory Type DDR3 Memory Size 750 MBytes Memory Frequency 532.2 MHz (3:16) CAS# latency (CL) 7.0 RAS# to CAS# delay (tRCD) 7 RAS# Precharge (tRP) 7 Cycle Time (tRAS) 20 Bank Cycle Time (tRC) 27 Memory SPD NO INFO AIDA64 North bridge Properties North bridge AMD K14 IMC Supported Memory Types DDR3-800, DDR3-1066 SDRAM Memory Slots DRAM Slot #1 1 GB (DDR3 SDRAM) Integrated Graphics Controller Graphics Controller Type AMD Radeon HD 6290 (Wrestler) Graphics Controller Status Enabled Graphics Frame Buffer Size 256 MB

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• Mysql InnoDB and quickly applying large updates

  - by Tim

  Basically my problem is that I have a large table of about 17,000,000 products that I need to apply a bunch of updates to really quickly. The table has 30 columns with the id set as int(10) AUTO_INCREMENT. I have another table which all of the updates for this table are stored in, these updates have to be pre-calculated as they take a couple of days to calculate. This table is in the format of [ product_id int(10), update_value int(10) ]. The strategy I'm taking to issue these 17 million updates quickly is to load all of these updates into memory in a ruby script and group them in a hash of arrays so that each update_value is a key and each array is a list of sorted product_id's. { 150: => [1,2,3,4,5,6], 160: => [7,8,9,10] } Updates are then issued in the format of UPDATE product SET update_value = 150 WHERE product_id IN (1,2,3,4,5,6); UPDATE product SET update_value = 160 WHERE product_id IN (7,8,9,10); I'm pretty sure I'm doing this correctly in the sense that issuing the updates on sorted batches of product_id's should be the optimal way to do it with mysql / innodb. I'm hitting a weird issue though where when I was testing with updating ~13 million records, this only took around 45 minutes. Now I'm testing with more data, ~17 million records and the updates are taking closer to 120 minutes. I would have expected some sort of speed decrease here but not to the degree that I'm seeing. Any advice on how I can speed this up or what could be slowing me down with this larger record set? As far as server specs go they're pretty good, heaps of memory / cpu, the whole DB should fit into memory with plenty of room to grow.

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• java memory allocation under linux

  - by pstanton

  I'm running 4 java processes with the following command: java -Xmx256m -jar ... and the system has 8Gb memory under fedora 12. however it is apparently going into swap. how can that be if 4 x 256m = 1Gb ? EDIT: also, how can all 8Gb of memory be used with so little memory allocated to basically the only thing running? is it java not garbage collecting because the OS tells it it doesn't need to or what? TOP: top - 20:13:57 up 3:55, 6 users, load average: 1.99, 2.54, 2.67 Tasks: 251 total, 6 running, 245 sleeping, 0 stopped, 0 zombie Cpu(s): 50.1%us, 2.9%sy, 0.0%ni, 45.1%id, 1.1%wa, 0.0%hi, 0.8%si, 0.0%st Mem: 8252304k total, 8195552k used, 56752k free, 34356k buffers Swap: 10354680k total, 74044k used, 10280636k free, 6624148k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1948 xxxxxxxx 20 0 1624m 240m 4020 S 96.8 3.0 164:33.75 java 1927 xxxxxxxx 20 0 139m 31m 27m R 91.8 0.4 38:34.55 postgres 1929 xxxxxxxx 20 0 1624m 200m 3984 S 86.2 2.5 183:24.88 java 1969 xxxxxxxx 20 0 1624m 292m 3984 S 65.6 3.6 154:06.76 java 1987 xxxxxxxx 20 0 137m 29m 27m R 28.5 0.4 75:49.82 postgres 1581 root 20 0 159m 18m 4712 S 22.5 0.2 52:42.54 Xorg 2411 xxxxxxxx 20 0 309m 9748 4544 S 20.9 0.1 45:05.08 gnome-system-mo 1947 xxxxxxxx 20 0 137m 28m 27m S 13.3 0.4 44:46.04 postgres 1772 xxxxxxxx 20 0 135m 25m 25m S 4.0 0.3 1:09.14 postgres 1966 xxxxxxxx 20 0 137m 29m 27m S 3.0 0.4 64:27.09 postgres 1773 xxxxxxxx 20 0 135m 732 624 S 1.0 0.0 0:24.86 postgres 2464 xxxxxxxx 20 0 15028 1156 744 R 0.7 0.0 0:49.14 top 344 root 15 -5 0 0 0 S 0.3 0.0 0:02.26 kdmflush 1 root 20 0 4124 620 524 S 0.0 0.0 0:00.88 init 2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0 4 root 15 -5 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0

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• Ubuntu 12.04 VirtualBox on powerful W7 quite slow

  - by wnstnsmth

  I own a Thinkpad T420s with 8GB RAM, 160 GB SSD and a quite fast i7 processor. Summa summarum a very fast computer that works perfectly. Now, I am not very impressed by the performance of my Ubuntu 12.04 virtual machine running on VirtualBox 4.1.18. I assume that Virtual Machines are always a bit slower than the guest system, still I think it should be more performant given the hardware settings I give it: 4096 MB RAM 1 CPU without CPU limitation (I would like to give it more but then it does not seem to work - I am not experienced in this maybe somebody could give me advice on this too) Activated PAE/NX, VT-x/AMD-V and Nested Paging 96 MB Graphics Memory (no 2D or 3D acceleration) ~ 14 GB disk space, currently about 7 GB are used Maybe I misconfigured something, could you give me a hint please? Thanks! Edit: What I mean by slow is that for example switching tabs in the browser (whether FF or Chrome) only goes with a 0.5s delay or something, as well as switching application windows and/or double-clicking applications in the dock to get all open windows.. opening Aptana takes about a minute whereas opening something like Photoshop on the guest system takes 5 seconds

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• Burning Linux ISO to DVD and making it bootable.

  - by toc777

  Hi everyone, I just downloaded the Fedora 14 Live-Desktop ISO and used CDBurnerXP to burn the image to a DVD. For some reason the first time I burned the image nothing showed up on the DVD when I accessed it even though CDBurnerXP said it had successfully burned to the disk. I did it again and the ISO shows up on the disk (I don't think this is right, should it be the files inside the image that show up on disk or the image file??). The problem now is my dell PC can't find the ISO when I try to boot from it. I get an error saying it can't boot from the CD. I have verified the ISO image as directed from the Fedora website. My question is how do I make a bootable CD from a Fedora Live-Desktop ISO? How can I verify that the ISO was written to the CD correctly and has anyone had any issues booting from a CD using a Dell desktop (I'm not at home at the moment so I can't check what model it is but its old enough, I've had it for about 5 years). EDIT: All that needed to be done was to burn the image to CD as an image and not a data file. The first three times failed, I'm not sure if this was because of faulty DVD's or if the write speed was too high (16x). I put in a new DVD and changed the write speed to 8x, the image was then properly burned to the disk without any errors. Thanks.

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• Very high Magento/Apache memory usage even without visitors (are we fooled by our hosting company?)

  - by MrDobalina

  I am no server guy and we have issues with our speed so I come here asking for advise. We have a VPS with 2 cores and 2gb of RAM at a Magento specialized hosting company. Over the course of the last weeks our site speed has gotten worse, even though our store is new, has less than 1000 SKUs and not even 100 visitos a day. At magespeedtest.com we only get 1.87 trans/sec @ 2.11 secs each with a mere 5 concurrent users. Our magento log files are clean, we have no huge database tables or anything like that. When we take a look at our server real time stats, we see that the memory usage jumped up from about 34% to 71% and now 82% in just a few days in idle, with no visitors on the site. Our hosting company said that we do not need to worry about that as it`s maybe related to mysql which creates buffers (which are maybe not even actually being used) and what is important is CPU and swap - stats are ok here. They also said that the low benchmark scores are caused by bad extensions or template modifications on our side. We are not sure if we can trust that statement as we only have 4 plugins installed (all from aheadworks and amasty which are known to be one of the best magento extension developers). Our template modifications are purely html and css, no modifications to the php code. Our pagespeed is ranked with 93/100 in firebug and Magento is properly configured, so the problem really just gets obvious when there are a handful of users on the site at the same time. Can anyone confirm our hosting`s statement about memory usage and where can I start looking for a solution?

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• Display on secondary video card (Nvidia 8400 GS): horrible refresh, bogs system

  - by minameismud

  This is my work computer, but it's a small shop. We do business software development. The most hardcore thing we create is some web animations with html5 and fancy javascript/css. The base machine is a Dell Precision T3500 - Xeon W3550 (3.07GHz quad), 6GB ram, pair of 500GB harddrives, and Win 7 x64 Enterprise SP1. My primary video card is an ATI FirePro V4800 1GB in a PCIe slot of some speed driving a pair of 23s at 1920x1080 through DisplayPort-HDMI adapters. The secondary card is an NVidia GeForce 8400GS in a PCI slot driving a single 17" at 1280x1024 through DVI. On either of the 23" monitors, windows move smoothly, scroll quickly, and are generally very responsive. On the 17", it's slow, chunky, and when I'm trying to scroll a ton of content, Windows will occasionally suggest I drop to the Windows Basic theme. I've updated drivers for both cards, and I've gotten every Windows update relating to video. Specifically: ATI FirePro Provider: Advanced Micro Devices, Inc Date: 6/22/2014 Version: 13.352.1014.0 NVidia 8400 GS Provider: NVIDIA Date: 7/2/2014 Version: 9.18.13.4052 Unfortunately, new hardware isn't really an option. Is there anything I can do software-wise to speed up the NVidia-driven monitor?

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• How many VPS do I need for my website? [duplicate]

  - by michael

  This question already has an answer here: How do you do load testing and capacity planning for web sites? 3 answers I made a website which aims at simulating a trading market. There are a list of prices and corresponding volumes that people want to purchase. Users can purchase at any price any time. My website retrieves the prices and volumes from my database every 2 seconds (I have to update the user's browser frequently to allow them to see the current market). Users' database INSERT query can be sent any time if they purchase. I used ajax to post or get data from my database (sometimes nested ajax calls). So, every 2 seconds, each user will send or retrieve data by using more than 20 database queries (in order to show a users the current prices and volumes). Also, I may have 200 users at a time. I was not using VPS before, and I got banned because of using too much CPU resources on my host. Now, I've purchased VPS*2 from a hosting servers. I have: CPU Speed: 2000 Mhz Memory: 2048 MB Disk Space: 20000 MB Bandwidth: 2000 GB Connection: 40 Mb/s Dedicated IP's 2 IP's Is this enough for my 200 users? Also, which VPS OS is suitable for me? Thank you.

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• What is the fastest cyclic synchronization in Java (ExecutorService vs. CyclicBarrier vs. X)?

  - by Alex Dunlop

  Which Java synchronization construct is likely to provide the best performance for a concurrent, iterative processing scenario with a fixed number of threads like the one outlined below? After experimenting on my own for a while (using ExecutorService and CyclicBarrier) and being somewhat surprised by the results, I would be grateful for some expert advice and maybe some new ideas. Existing questions here do not seem to focus primarily on performance, hence this new one. Thanks in advance! The core of the app is a simple iterative data processing algorithm, parallelized to the spread the computational load across 8 cores on a Mac Pro, running OS X 10.6 and Java 1.6.0_07. The data to be processed is split into 8 blocks and each block is fed to a Runnable to be executed by one of a fixed number of threads. Parallelizing the algorithm was fairly straightforward, and it functionally works as desired, but its performance is not yet what I think it could be. The app seems to spend a lot of time in system calls synchronizing, so after some profiling I wonder whether I selected the most appropriate synchronization mechanism(s). A key requirement of the algorithm is that it needs to proceed in stages, so the threads need to sync up at the end of each stage. The main thread prepares the work (very low overhead), passes it to the threads, lets them work on it, then proceeds when all threads are done, rearranges the work (again very low overhead) and repeats the cycle. The machine is dedicated to this task, Garbage Collection is minimized by using per-thread pools of pre-allocated items, and the number of threads can be fixed (no incoming requests or the like, just one thread per CPU core). V1 - ExecutorService My first implementation used an ExecutorService with 8 worker threads. The program creates 8 tasks holding the work and then lets them work on it, roughly like this: // create one thread per CPU executorService = Executors.newFixedThreadPool( 8 ); ... // now process data in cycles while( ...) { // package data into 8 work items ... // create one Callable task per work item ... // submit the Callables to the worker threads executorService.invokeAll( taskList ); } This works well functionally (it does what it should), and for very large work items indeed all 8 CPUs become highly loaded, as much as the processing algorithm would be expected to allow (some work items will finish faster than others, then idle). However, as the work items become smaller (and this is not really under the program's control), the user CPU load shrinks dramatically: blocksize | system | user | cycles/sec 256k 1.8% 85% 1.30 64k 2.5% 77% 5.6 16k 4% 64% 22.5 4096 8% 56% 86 1024 13% 38% 227 256 17% 19% 420 64 19% 17% 948 16 19% 13% 1626 Legend: - block size = size of the work item (= computational steps) - system = system load, as shown in OS X Activity Monitor (red bar) - user = user load, as shown in OS X Activity Monitor (green bar) - cycles/sec = iterations through the main while loop, more is better The primary area of concern here is the high percentage of time spent in the system, which appears to be driven by thread synchronization calls. As expected, for smaller work items, ExecutorService.invokeAll() will require relatively more effort to sync up the threads versus the amount of work being performed in each thread. But since ExecutorService is more generic than it would need to be for this use case (it can queue tasks for threads if there are more tasks than cores), I though maybe there would be a leaner synchronization construct. V2 - CyclicBarrier The next implementation used a CyclicBarrier to sync up the threads before receiving work and after completing it, roughly as follows: main() { // create the barrier barrier = new CyclicBarrier( 8 + 1 ); // create Runable for thread, tell it about the barrier Runnable task = new WorkerThreadRunnable( barrier ); // start the threads for( int i = 0; i < 8; i++ ) { // create one thread per core new Thread( task ).start(); } while( ... ) { // tell threads about the work ... // N threads + this will call await(), then system proceeds barrier.await(); // ... now worker threads work on the work... // wait for worker threads to finish barrier.await(); } } class WorkerThreadRunnable implements Runnable { CyclicBarrier barrier; WorkerThreadRunnable( CyclicBarrier barrier ) { this.barrier = barrier; } public void run() { while( true ) { // wait for work barrier.await(); // do the work ... // wait for everyone else to finish barrier.await(); } } } Again, this works well functionally (it does what it should), and for very large work items indeed all 8 CPUs become highly loaded, as before. However, as the work items become smaller, the load still shrinks dramatically: blocksize | system | user | cycles/sec 256k 1.9% 85% 1.30 64k 2.7% 78% 6.1 16k 5.5% 52% 25 4096 9% 29% 64 1024 11% 15% 117 256 12% 8% 169 64 12% 6.5% 285 16 12% 6% 377 For large work items, synchronization is negligible and the performance is identical to V1. But unexpectedly, the results of the (highly specialized) CyclicBarrier seem MUCH WORSE than those for the (generic) ExecutorService: throughput (cycles/sec) is only about 1/4th of V1. A preliminary conclusion would be that even though this seems to be the advertised ideal use case for CyclicBarrier, it performs much worse than the generic ExecutorService. V3 - Wait/Notify + CyclicBarrier It seemed worth a try to replace the first cyclic barrier await() with a simple wait/notify mechanism: main() { // create the barrier // create Runable for thread, tell it about the barrier // start the threads while( ... ) { // tell threads about the work // for each: workerThreadRunnable.setWorkItem( ... ); // ... now worker threads work on the work... // wait for worker threads to finish barrier.await(); } } class WorkerThreadRunnable implements Runnable { CyclicBarrier barrier; @NotNull volatile private Callable<Integer> workItem; WorkerThreadRunnable( CyclicBarrier barrier ) { this.barrier = barrier; this.workItem = NO_WORK; } final protected void setWorkItem( @NotNull final Callable<Integer> callable ) { synchronized( this ) { workItem = callable; notify(); } } public void run() { while( true ) { // wait for work while( true ) { synchronized( this ) { if( workItem != NO_WORK ) break; try { wait(); } catch( InterruptedException e ) { e.printStackTrace(); } } } // do the work ... // wait for everyone else to finish barrier.await(); } } } Again, this works well functionally (it does what it should). blocksize | system | user | cycles/sec 256k 1.9% 85% 1.30 64k 2.4% 80% 6.3 16k 4.6% 60% 30.1 4096 8.6% 41% 98.5 1024 12% 23% 202 256 14% 11.6% 299 64 14% 10.0% 518 16 14.8% 8.7% 679 The throughput for small work items is still much worse than that of the ExecutorService, but about 2x that of the CyclicBarrier. Eliminating one CyclicBarrier eliminates half of the gap. V4 - Busy wait instead of wait/notify Since this app is the primary one running on the system and the cores idle anyway if they're not busy with a work item, why not try a busy wait for work items in each thread, even if that spins the CPU needlessly. The worker thread code changes as follows: class WorkerThreadRunnable implements Runnable { // as before final protected void setWorkItem( @NotNull final Callable<Integer> callable ) { workItem = callable; } public void run() { while( true ) { // busy-wait for work while( true ) { if( workItem != NO_WORK ) break; } // do the work ... // wait for everyone else to finish barrier.await(); } } } Also works well functionally (it does what it should). blocksize | system | user | cycles/sec 256k 1.9% 85% 1.30 64k 2.2% 81% 6.3 16k 4.2% 62% 33 4096 7.5% 40% 107 1024 10.4% 23% 210 256 12.0% 12.0% 310 64 11.9% 10.2% 550 16 12.2% 8.6% 741 For small work items, this increases throughput by a further 10% over the CyclicBarrier + wait/notify variant, which is not insignificant. But it is still much lower-throughput than V1 with the ExecutorService. V5 - ? So what is the best synchronization mechanism for such a (presumably not uncommon) problem? I am weary of writing my own sync mechanism to completely replace ExecutorService (assuming that it is too generic and there has to be something that can still be taken out to make it more efficient). It is not my area of expertise and I'm concerned that I'd spend a lot of time debugging it (since I'm not even sure my wait/notify and busy wait variants are correct) for uncertain gain. Any advice would be greatly appreciated.

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• rotating bitmaps. In code.

  - by Marco van de Voort

  Is there a faster way to rotate a large bitmap by 90 or 270 degrees than simply doing a nested loop with inverted coordinates? The bitmaps are 8bpp and typically 2048*2400*8bpp Currently I do this by simply copying with argument inversion, roughly (pseudo code: for x = 0 to 2048-1 for y = 0 to 2048-1 dest[x][y]=src[y][x]; (In reality I do it with pointers, for a bit more speed, but that is roughly the same magnitude) GDI is quite slow with large images, and GPU load/store times for textures (GF7 cards) are in the same magnitude as the current CPU time. Any tips, pointers? An in-place algorithm would even be better, but speed is more important than being in-place. Target is Delphi, but it is more an algorithmic question. SSE(2) vectorization no problem, it is a big enough problem for me to code it in assembler Duplicates How do you rotate a two dimensional array?. Follow up to Nils' answer Image 2048x2700 - 2700x2048 Compiler Turbo Explorer 2006 with optimization on. Windows: Power scheme set to "Always on". (important!!!!) Machine: Core2 6600 (2.4 GHz) time with old routine: 32ms (step 1) time with stepsize 8 : 12ms time with stepsize 16 : 10ms time with stepsize 32+ : 9ms Meanwhile I also tested on a Athlon 64 X2 (5200+ iirc), and the speed up there was slightly more than a factor four (80 to 19 ms). The speed up is well worth it, thanks. Maybe that during the summer months I'll torture myself with a SSE(2) version. However I already thought about how to tackle that, and I think I'll run out of SSE2 registers for an straight implementation: for n:=0 to 7 do begin load r0, <source+n*rowsize> shift byte from r0 into r1 shift byte from r0 into r2 .. shift byte from r0 into r8 end; store r1, <target> store r2, <target+1*<rowsize> .. store r8, <target+7*<rowsize> So 8x8 needs 9 registers, but 32-bits SSE only has 8. Anyway that is something for the summer months :-) Note that the pointer thing is something that I do out of instinct, but it could be there is actually something to it, if your dimensions are not hardcoded, the compiler can't turn the mul into a shift. While muls an sich are cheap nowadays, they also generate more register pressure afaik. The code (validated by subtracting result from the "naieve" rotate1 implementation): const stepsize = 32; procedure rotatealign(Source: tbw8image; Target:tbw8image); var stepsx,stepsy,restx,resty : Integer; RowPitchSource, RowPitchTarget : Integer; pSource, pTarget,ps1,ps2 : pchar; x,y,i,j: integer; rpstep : integer; begin RowPitchSource := source.RowPitch; // bytes to jump to next line. Can be negative (includes alignment) RowPitchTarget := target.RowPitch; rpstep:=RowPitchTarget*stepsize; stepsx:=source.ImageWidth div stepsize; stepsy:=source.ImageHeight div stepsize; // check if mod 16=0 here for both dimensions, if so -> SSE2. for y := 0 to stepsy - 1 do begin psource:=source.GetImagePointer(0,y*stepsize); // gets pointer to pixel x,y ptarget:=Target.GetImagePointer(target.imagewidth-(y+1)*stepsize,0); for x := 0 to stepsx - 1 do begin for i := 0 to stepsize - 1 do begin ps1:=@psource[rowpitchsource*i]; // ( 0,i) ps2:=@ptarget[stepsize-1-i]; // (maxx-i,0); for j := 0 to stepsize - 1 do begin ps2[0]:=ps1[j]; inc(ps2,RowPitchTarget); end; end; inc(psource,stepsize); inc(ptarget,rpstep); end; end; // 3 more areas to do, with dimensions // - stepsy*stepsize * restx // right most column of restx width // - stepsx*stepsize * resty // bottom row with resty height // - restx*resty // bottom-right rectangle. restx:=source.ImageWidth mod stepsize; // typically zero because width is // typically 1024 or 2048 resty:=source.Imageheight mod stepsize; if restx>0 then begin // one loop less, since we know this fits in one line of "blocks" psource:=source.GetImagePointer(source.ImageWidth-restx,0); // gets pointer to pixel x,y ptarget:=Target.GetImagePointer(Target.imagewidth-stepsize,Target.imageheight-restx); for y := 0 to stepsy - 1 do begin for i := 0 to stepsize - 1 do begin ps1:=@psource[rowpitchsource*i]; // ( 0,i) ps2:=@ptarget[stepsize-1-i]; // (maxx-i,0); for j := 0 to restx - 1 do begin ps2[0]:=ps1[j]; inc(ps2,RowPitchTarget); end; end; inc(psource,stepsize*RowPitchSource); dec(ptarget,stepsize); end; end; if resty>0 then begin // one loop less, since we know this fits in one line of "blocks" psource:=source.GetImagePointer(0,source.ImageHeight-resty); // gets pointer to pixel x,y ptarget:=Target.GetImagePointer(0,0); for x := 0 to stepsx - 1 do begin for i := 0 to resty- 1 do begin ps1:=@psource[rowpitchsource*i]; // ( 0,i) ps2:=@ptarget[resty-1-i]; // (maxx-i,0); for j := 0 to stepsize - 1 do begin ps2[0]:=ps1[j]; inc(ps2,RowPitchTarget); end; end; inc(psource,stepsize); inc(ptarget,rpstep); end; end; if (resty>0) and (restx>0) then begin // another loop less, since only one block psource:=source.GetImagePointer(source.ImageWidth-restx,source.ImageHeight-resty); // gets pointer to pixel x,y ptarget:=Target.GetImagePointer(0,target.ImageHeight-restx); for i := 0 to resty- 1 do begin ps1:=@psource[rowpitchsource*i]; // ( 0,i) ps2:=@ptarget[resty-1-i]; // (maxx-i,0); for j := 0 to restx - 1 do begin ps2[0]:=ps1[j]; inc(ps2,RowPitchTarget); end; end; end; end;

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• Help modify a javascript code to perform a div scroll

  - by Jamex

  Hi, The code below uses javascript to smoothly scroll content in a div. I don't need the smooth scrolling action, and only need the onclick action for the buttons. I would like to use this code so that if a scroll up/down button is pressed, the scroll would instantaneously jump up/down to a position, just like if you were to press the reset button (see demo link). If the down button is pressed, it would jump down the position of the content div (say 300px) and show the text instantaneously without showing how the scrolling text. I am not familiar with JS, so it you know a shorter way, please suggest. TIA the demo link is HERE The code is > this.easyscroll = function(){ // id of the container element var > id = "myContent"; // navigation > buttons text var nav = ["Scroll Up", > "Scroll Down", "Reset"]; // id for > each navigation button (OPTIONAL) var > navId = ["btnUp", "btnDown", > "btnReset"]; > > // movement speed var speed = 5; > // desired height of the container > element (in pixels) var height = 200; > // // END CONFIG // do not edit > below this line (unless you want to of > course :) ) // > > var obj = > document.getElementById(id); obj.up > = false; obj.down = false; obj.fast = false; > > var container = > document.createElement("div"); var > parent = obj.parentNode; > container.id="easyscroll"; > parent.insertBefore(container,obj); > parent.removeChild(obj); > container.style.position = > "relative"; container.style.height = > height + "px"; > container.style.overflow = "hidden"; > obj.style.position = "absolute"; > obj.style.top = "0"; obj.style.left > = "0"; container.appendChild(obj); var btns = new Array(); var ul = > document.createElement("ul"); > ul.id="easyscrollnav"; for (var > i=0;i<nav.length;i++){ var li = > document.createElement("li"); > li.innerHTML = nav[i]; li.id = > navId[i]; btns.push(li); > ul.appendChild(li); }; > parent.insertBefore(ul,container); > btns[0].onmouseover = function(){ > obj.up = true; this.className = > "over"; }; btns[0].onmouseout = > function(){ obj.up = false; > this.className = ""; }; > btns[1].onmouseover = function(){ > obj.down = true; this.className = > "over"; }; btns[1].onmouseout = > function(){ obj.down = false; > this.className = ""; }; > btns[0].onmousedown = > btns[1].onmousedown = function(){ > obj.fast = true; }; > btns[0].onmouseup = btns[1].onmouseup > = function(){ obj.fast = false; }; btns[2].onmouseover = > function(){ this.className = > "over"; }; btns[2].onmouseout = > function(){ this.className = ""; > }; btns[2].onclick = function(){ > obj.style.top = "0px"; }; > this.start = function(){ var newTop; var objHeight = > obj.offsetHeight; var top = > obj.offsetTop; var fast = (obj.fast) > ? 2 : 1; if(obj.down){ newTop > = ((objHeight+top) > height) ? top-(speed*fast) : top; > obj.style.top = newTop + "px"; > }; if(obj.up){ newTop = > (top < 0) ? top+(speed*fast) : top; > obj.style.top = newTop + "px"; }; > }; obj.interval = > setInterval("start()",50); }; > > > this.addEvent = function(obj,type,fn){ > if(obj.attachEvent){ > obj['e'+type+fn] = fn; > obj[type+fn] = > function(){obj['e'+type+fn](window.event > );} obj.attachEvent('on'+type, > obj[type+fn]); } else { > obj.addEventListener(type,fn,false); > }; }; > addEvent(window,"load",easyscroll);

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• Did I lose my RAID again?

  - by BarsMonster

  Hi! A little history: 2 years ago I was really excited to find out that mdadm is so powerful that it even can reshape arrays, so you can start with a smaller array and then grow it as you need. I've bought 3x1Tb drives and made a RAID-5. It was fine for a year. Then I bought 2x more, and tried to reshape to RAID-6 out of 5 drives, and due to some mess with superblock versions, lost all content. Had to rebuild it from scratch, but 2Tb of data were gone. Yesterday I bought 2 more drives, and this time I had everything: properly built array, UPS. I've disabled write intent map, added 2 new drives as spares and run a command to grow array to 7-disks. It started working, but speed was ridiculously slow, ~100kb/sec. After processing first 37Mb at such an amazing speed, one of old HDDs fails. I properly shutdown the PC and disconnected the failed drive. After bootup it appeared that it recreated the intent map as it was still in mdadm config, so I removed it from config and rebooted again. Now all I see is that all mdadm processes deadlock, and don't do anything. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1937 root 20 0 12992 608 444 D 0 0.1 0:00.00 mdadm 2283 root 20 0 12992 852 704 D 0 0.1 0:00.01 mdadm 2287 root 20 0 0 0 0 D 0 0.0 0:00.01 md0_reshape 2288 root 18 -2 12992 820 676 D 0 0.1 0:00.01 mdadm And all I see in mdstat is: $ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid6 sdb1[1] sdg1[4] sdf1[7] sde1[6] sdd1[0] sdc1[5] 2929683456 blocks super 1.2 level 6, 1024k chunk, algorithm 2 [7/6] [UU_UUUU] [>....................] reshape = 0.0% (37888/976561152) finish=567604147.2min speed=0K/sec I've already tried mdadm 2.6.7, 3.1.4 and 3.2 - nothing helps. Did I lose my data again? Any suggestions on how can I make this work? OS is Ubuntu Server 10.04.2. PS. Needless to say, the data is inaccessible - I cannot mount /dev/md0 to save the most valuable data. You can see my disappointment - the very specific thing I was excited about failed twice taking 5Tb of my data with it. Update: It appears there is some nice info in kern.log: 21:38:48 ...: [ 166.522055] raid5: reshape will continue 21:38:48 ...: [ 166.522085] raid5: device sdb1 operational as raid disk 1 21:38:48 ...: [ 166.522091] raid5: device sdg1 operational as raid disk 4 21:38:48 ...: [ 166.522097] raid5: device sdf1 operational as raid disk 5 21:38:48 ...: [ 166.522102] raid5: device sde1 operational as raid disk 6 21:38:48 ...: [ 166.522107] raid5: device sdd1 operational as raid disk 0 21:38:48 ...: [ 166.522111] raid5: device sdc1 operational as raid disk 3 21:38:48 ...: [ 166.523942] raid5: allocated 7438kB for md0 21:38:48 ...: [ 166.524041] 1: w=1 pa=2 pr=5 m=2 a=2 r=7 op1=0 op2=0 21:38:48 ...: [ 166.524050] 4: w=2 pa=2 pr=5 m=2 a=2 r=7 op1=0 op2=0 21:38:48 ...: [ 166.524056] 5: w=3 pa=2 pr=5 m=2 a=2 r=7 op1=0 op2=0 21:38:48 ...: [ 166.524062] 6: w=4 pa=2 pr=5 m=2 a=2 r=7 op1=0 op2=0 21:38:48 ...: [ 166.524068] 0: w=5 pa=2 pr=5 m=2 a=2 r=7 op1=0 op2=0 21:38:48 ...: [ 166.524073] 3: w=6 pa=2 pr=5 m=2 a=2 r=7 op1=0 op2=0 21:38:48 ...: [ 166.524079] raid5: raid level 6 set md0 active with 6 out of 7 devices, algorithm 2 21:38:48 ...: [ 166.524519] RAID5 conf printout: 21:38:48 ...: [ 166.524523] --- rd:7 wd:6 21:38:48 ...: [ 166.524528] disk 0, o:1, dev:sdd1 21:38:48 ...: [ 166.524532] disk 1, o:1, dev:sdb1 21:38:48 ...: [ 166.524537] disk 3, o:1, dev:sdc1 21:38:48 ...: [ 166.524541] disk 4, o:1, dev:sdg1 21:38:48 ...: [ 166.524545] disk 5, o:1, dev:sdf1 21:38:48 ...: [ 166.524550] disk 6, o:1, dev:sde1 21:38:48 ...: [ 166.524553] ...ok start reshape thread 21:38:48 ...: [ 166.524727] md0: detected capacity change from 0 to 2999995858944 21:38:48 ...: [ 166.524735] md: reshape of RAID array md0 21:38:48 ...: [ 166.524740] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. 21:38:48 ...: [ 166.524745] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reshape. 21:38:48 ...: [ 166.524756] md: using 128k window, over a total of 976561152 blocks. 21:39:05 ...: [ 166.525013] md0: 21:42:04 ...: [ 362.520063] INFO: task mdadm:1937 blocked for more than 120 seconds. 21:42:04 ...: [ 362.520068] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:42:04 ...: [ 362.520073] mdadm D 00000000ffffffff 0 1937 1 0x00000000 21:42:04 ...: [ 362.520083] ffff88002ef4f5d8 0000000000000082 0000000000015bc0 0000000000015bc0 21:42:04 ...: [ 362.520092] ffff88002eb5b198 ffff88002ef4ffd8 0000000000015bc0 ffff88002eb5ade0 21:42:04 ...: [ 362.520100] 0000000000015bc0 ffff88002ef4ffd8 0000000000015bc0 ffff88002eb5b198 21:42:04 ...: [ 362.520107] Call Trace: 21:42:04 ...: [ 362.520133] [<ffffffffa0224892>] get_active_stripe+0x312/0x3f0 [raid456] 21:42:04 ...: [ 362.520148] [<ffffffff81059ae0>] ? default_wake_function+0x0/0x20 21:42:04 ...: [ 362.520159] [<ffffffffa0228413>] make_request+0x243/0x4b0 [raid456] 21:42:04 ...: [ 362.520169] [<ffffffffa0221a90>] ? release_stripe+0x50/0x70 [raid456] 21:42:04 ...: [ 362.520179] [<ffffffff81084790>] ? autoremove_wake_function+0x0/0x40 21:42:04 ...: [ 362.520188] [<ffffffff81414df0>] md_make_request+0xc0/0x130 21:42:04 ...: [ 362.520194] [<ffffffff81414df0>] ? md_make_request+0xc0/0x130 21:42:04 ...: [ 362.520205] [<ffffffff8129f8c1>] generic_make_request+0x1b1/0x4f0 21:42:04 ...: [ 362.520214] [<ffffffff810f6515>] ? mempool_alloc_slab+0x15/0x20 21:42:04 ...: [ 362.520222] [<ffffffff8116c2ec>] ? alloc_buffer_head+0x1c/0x60 21:42:04 ...: [ 362.520230] [<ffffffff8129fc80>] submit_bio+0x80/0x110 21:42:04 ...: [ 362.520236] [<ffffffff8116c849>] submit_bh+0xf9/0x140 21:42:04 ...: [ 362.520244] [<ffffffff8116f124>] block_read_full_page+0x274/0x3b0 21:42:04 ...: [ 362.520251] [<ffffffff81172c90>] ? blkdev_get_block+0x0/0x70 21:42:04 ...: [ 362.520258] [<ffffffff8110d875>] ? __inc_zone_page_state+0x35/0x40 21:42:04 ...: [ 362.520265] [<ffffffff810f46d8>] ? add_to_page_cache_locked+0xe8/0x160 21:42:04 ...: [ 362.520272] [<ffffffff81173d78>] blkdev_readpage+0x18/0x20 21:42:04 ...: [ 362.520279] [<ffffffff810f484b>] __read_cache_page+0x7b/0xe0 21:42:04 ...: [ 362.520285] [<ffffffff81173d60>] ? blkdev_readpage+0x0/0x20 21:42:04 ...: [ 362.520290] [<ffffffff81173d60>] ? blkdev_readpage+0x0/0x20 21:42:04 ...: [ 362.520297] [<ffffffff810f57dc>] do_read_cache_page+0x3c/0x120 21:42:04 ...: [ 362.520304] [<ffffffff810f5909>] read_cache_page_async+0x19/0x20 21:42:04 ...: [ 362.520310] [<ffffffff810f591e>] read_cache_page+0xe/0x20 21:42:04 ...: [ 362.520317] [<ffffffff811a6cb0>] read_dev_sector+0x30/0xa0 21:42:04 ...: [ 362.520324] [<ffffffff811a7fcd>] amiga_partition+0x6d/0x460 21:42:04 ...: [ 362.520331] [<ffffffff811a7938>] check_partition+0x138/0x190 21:42:04 ...: [ 362.520338] [<ffffffff811a7a7a>] rescan_partitions+0xea/0x2f0 21:42:04 ...: [ 362.520344] [<ffffffff811744c7>] __blkdev_get+0x267/0x3d0 21:42:04 ...: [ 362.520350] [<ffffffff81174650>] ? blkdev_open+0x0/0xc0 21:42:04 ...: [ 362.520356] [<ffffffff81174640>] blkdev_get+0x10/0x20 21:42:04 ...: [ 362.520362] [<ffffffff811746c1>] blkdev_open+0x71/0xc0 21:42:04 ...: [ 362.520369] [<ffffffff811419f3>] __dentry_open+0x113/0x370 21:42:04 ...: [ 362.520377] [<ffffffff81253f8f>] ? security_inode_permission+0x1f/0x30 21:42:04 ...: [ 362.520385] [<ffffffff8114de3f>] ? inode_permission+0xaf/0xd0 21:42:04 ...: [ 362.520391] [<ffffffff81141d67>] nameidata_to_filp+0x57/0x70 21:42:04 ...: [ 362.520398] [<ffffffff8115207a>] do_filp_open+0x2da/0xba0 21:42:04 ...: [ 362.520406] [<ffffffff811134a8>] ? unmap_vmas+0x178/0x310 21:42:04 ...: [ 362.520414] [<ffffffff8115dbfa>] ? alloc_fd+0x10a/0x150 21:42:04 ...: [ 362.520421] [<ffffffff81141769>] do_sys_open+0x69/0x170 21:42:04 ...: [ 362.520428] [<ffffffff811418b0>] sys_open+0x20/0x30 21:42:04 ...: [ 362.520437] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b 21:42:04 ...: [ 362.520446] INFO: task mdadm:2283 blocked for more than 120 seconds. 21:42:04 ...: [ 362.520450] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:42:04 ...: [ 362.520454] mdadm D 0000000000000000 0 2283 2212 0x00000000 21:42:04 ...: [ 362.520462] ffff88002cca7d98 0000000000000086 0000000000015bc0 0000000000015bc0 21:42:04 ...: [ 362.520470] ffff88002ededf78 ffff88002cca7fd8 0000000000015bc0 ffff88002ededbc0 21:42:04 ...: [ 362.520478] 0000000000015bc0 ffff88002cca7fd8 0000000000015bc0 ffff88002ededf78 21:42:04 ...: [ 362.520485] Call Trace: 21:42:04 ...: [ 362.520495] [<ffffffff81543a97>] __mutex_lock_slowpath+0xf7/0x180 21:42:04 ...: [ 362.520502] [<ffffffff8154397b>] mutex_lock+0x2b/0x50 21:42:04 ...: [ 362.520508] [<ffffffff8117404d>] __blkdev_put+0x3d/0x190 21:42:04 ...: [ 362.520514] [<ffffffff811741b0>] blkdev_put+0x10/0x20 21:42:04 ...: [ 362.520520] [<ffffffff811741f3>] blkdev_close+0x33/0x60 21:42:04 ...: [ 362.520527] [<ffffffff81145375>] __fput+0xf5/0x210 21:42:04 ...: [ 362.520534] [<ffffffff811454b5>] fput+0x25/0x30 21:42:04 ...: [ 362.520540] [<ffffffff811415ad>] filp_close+0x5d/0x90 21:42:04 ...: [ 362.520546] [<ffffffff81141697>] sys_close+0xb7/0x120 21:42:04 ...: [ 362.520553] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b 21:42:04 ...: [ 362.520559] INFO: task md0_reshape:2287 blocked for more than 120 seconds. 21:42:04 ...: [ 362.520563] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:42:04 ...: [ 362.520567] md0_reshape D ffff88003aee96f0 0 2287 2 0x00000000 21:42:04 ...: [ 362.520575] ffff88003cf05a70 0000000000000046 0000000000015bc0 0000000000015bc0 21:42:04 ...: [ 362.520582] ffff88003aee9aa8 ffff88003cf05fd8 0000000000015bc0 ffff88003aee96f0 21:42:04 ...: [ 362.520590] 0000000000015bc0 ffff88003cf05fd8 0000000000015bc0 ffff88003aee9aa8 21:42:04 ...: [ 362.520597] Call Trace: 21:42:04 ...: [ 362.520608] [<ffffffffa0224892>] get_active_stripe+0x312/0x3f0 [raid456] 21:42:04 ...: [ 362.520616] [<ffffffff81059ae0>] ? default_wake_function+0x0/0x20 21:42:04 ...: [ 362.520626] [<ffffffffa0226f80>] reshape_request+0x4c0/0x9a0 [raid456] 21:42:04 ...: [ 362.520634] [<ffffffff81084790>] ? autoremove_wake_function+0x0/0x40 21:42:04 ...: [ 362.520644] [<ffffffffa022777a>] sync_request+0x31a/0x3a0 [raid456] 21:42:04 ...: [ 362.520651] [<ffffffff81052713>] ? __wake_up+0x53/0x70 21:42:04 ...: [ 362.520658] [<ffffffff814156b1>] md_do_sync+0x621/0xbb0 21:42:04 ...: [ 362.520668] [<ffffffff810387b9>] ? default_spin_lock_flags+0x9/0x10 21:42:04 ...: [ 362.520675] [<ffffffff8141640c>] md_thread+0x5c/0x130 21:42:04 ...: [ 362.520681] [<ffffffff81084790>] ? autoremove_wake_function+0x0/0x40 21:42:04 ...: [ 362.520688] [<ffffffff814163b0>] ? md_thread+0x0/0x130 21:42:04 ...: [ 362.520694] [<ffffffff81084416>] kthread+0x96/0xa0 21:42:04 ...: [ 362.520701] [<ffffffff810131ea>] child_rip+0xa/0x20 21:42:04 ...: [ 362.520707] [<ffffffff81084380>] ? kthread+0x0/0xa0 21:42:04 ...: [ 362.520713] [<ffffffff810131e0>] ? child_rip+0x0/0x20 21:42:04 ...: [ 362.520718] INFO: task mdadm:2288 blocked for more than 120 seconds. 21:42:04 ...: [ 362.520721] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:42:04 ...: [ 362.520725] mdadm D 0000000000000000 0 2288 1 0x00000000 21:42:04 ...: [ 362.520733] ffff88002cca9c18 0000000000000086 0000000000015bc0 0000000000015bc0 21:42:04 ...: [ 362.520741] ffff88003aee83b8 ffff88002cca9fd8 0000000000015bc0 ffff88003aee8000 21:42:04 ...: [ 362.520748] 0000000000015bc0 ffff88002cca9fd8 0000000000015bc0 ffff88003aee83b8 21:42:04 ...: [ 362.520755] Call Trace: 21:42:04 ...: [ 362.520763] [<ffffffff81543a97>] __mutex_lock_slowpath+0xf7/0x180 21:42:04 ...: [ 362.520771] [<ffffffff812a6d50>] ? exact_match+0x0/0x10 21:42:04 ...: [ 362.520777] [<ffffffff8154397b>] mutex_lock+0x2b/0x50 21:42:04 ...: [ 362.520783] [<ffffffff811742c8>] __blkdev_get+0x68/0x3d0 21:42:04 ...: [ 362.520790] [<ffffffff81174650>] ? blkdev_open+0x0/0xc0 21:42:04 ...: [ 362.520795] [<ffffffff81174640>] blkdev_get+0x10/0x20 21:42:04 ...: [ 362.520801] [<ffffffff811746c1>] blkdev_open+0x71/0xc0 21:42:04 ...: [ 362.520808] [<ffffffff811419f3>] __dentry_open+0x113/0x370 21:42:04 ...: [ 362.520815] [<ffffffff81253f8f>] ? security_inode_permission+0x1f/0x30 21:42:04 ...: [ 362.520821] [<ffffffff8114de3f>] ? inode_permission+0xaf/0xd0 21:42:04 ...: [ 362.520828] [<ffffffff81141d67>] nameidata_to_filp+0x57/0x70 21:42:04 ...: [ 362.520834] [<ffffffff8115207a>] do_filp_open+0x2da/0xba0 21:42:04 ...: [ 362.520841] [<ffffffff810ff0e1>] ? lru_cache_add_lru+0x21/0x40 21:42:04 ...: [ 362.520848] [<ffffffff8111109c>] ? do_anonymous_page+0x11c/0x330 21:42:04 ...: [ 362.520855] [<ffffffff81115d5f>] ? handle_mm_fault+0x31f/0x3c0 21:42:04 ...: [ 362.520862] [<ffffffff8115dbfa>] ? alloc_fd+0x10a/0x150 21:42:04 ...: [ 362.520868] [<ffffffff81141769>] do_sys_open+0x69/0x170 21:42:04 ...: [ 362.520874] [<ffffffff811418b0>] sys_open+0x20/0x30 21:42:04 ...: [ 362.520882] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b 21:44:04 ...: [ 482.520065] INFO: task mdadm:1937 blocked for more than 120 seconds. 21:44:04 ...: [ 482.520071] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:44:04 ...: [ 482.520077] mdadm D 00000000ffffffff 0 1937 1 0x00000000 21:44:04 ...: [ 482.520087] ffff88002ef4f5d8 0000000000000082 0000000000015bc0 0000000000015bc0 21:44:04 ...: [ 482.520096] ffff88002eb5b198 ffff88002ef4ffd8 0000000000015bc0 ffff88002eb5ade0 21:44:04 ...: [ 482.520104] 0000000000015bc0 ffff88002ef4ffd8 0000000000015bc0 ffff88002eb5b198 21:44:04 ...: [ 482.520112] Call Trace: 21:44:04 ...: [ 482.520139] [<ffffffffa0224892>] get_active_stripe+0x312/0x3f0 [raid456] 21:44:04 ...: [ 482.520154] [<ffffffff81059ae0>] ? default_wake_function+0x0/0x20 21:44:04 ...: [ 482.520165] [<ffffffffa0228413>] make_request+0x243/0x4b0 [raid456] 21:44:04 ...: [ 482.520175] [<ffffffffa0221a90>] ? release_stripe+0x50/0x70 [raid456] 21:44:04 ...: [ 482.520185] [<ffffffff81084790>] ? autoremove_wake_function+0x0/0x40 21:44:04 ...: [ 482.520194] [<ffffffff81414df0>] md_make_request+0xc0/0x130 21:44:04 ...: [ 482.520201] [<ffffffff81414df0>] ? md_make_request+0xc0/0x130 21:44:04 ...: [ 482.520212] [<ffffffff8129f8c1>] generic_make_request+0x1b1/0x4f0 21:44:04 ...: [ 482.520221] [<ffffffff810f6515>] ? mempool_alloc_slab+0x15/0x20 21:44:04 ...: [ 482.520229] [<ffffffff8116c2ec>] ? alloc_buffer_head+0x1c/0x60 21:44:04 ...: [ 482.520237] [<ffffffff8129fc80>] submit_bio+0x80/0x110 21:44:04 ...: [ 482.520244] [<ffffffff8116c849>] submit_bh+0xf9/0x140 21:44:04 ...: [ 482.520252] [<ffffffff8116f124>] block_read_full_page+0x274/0x3b0 21:44:04 ...: [ 482.520258] [<ffffffff81172c90>] ? blkdev_get_block+0x0/0x70 21:44:04 ...: [ 482.520266] [<ffffffff8110d875>] ? __inc_zone_page_state+0x35/0x40 21:44:04 ...: [ 482.520273] [<ffffffff810f46d8>] ? add_to_page_cache_locked+0xe8/0x160 21:44:04 ...: [ 482.520280] [<ffffffff81173d78>] blkdev_readpage+0x18/0x20 21:44:04 ...: [ 482.520286] [<ffffffff810f484b>] __read_cache_page+0x7b/0xe0 21:44:04 ...: [ 482.520293] [<ffffffff81173d60>] ? blkdev_readpage+0x0/0x20 21:44:04 ...: [ 482.520299] [<ffffffff81173d60>] ? blkdev_readpage+0x0/0x20 21:44:04 ...: [ 482.520306] [<ffffffff810f57dc>] do_read_cache_page+0x3c/0x120 21:44:04 ...: [ 482.520313] [<ffffffff810f5909>] read_cache_page_async+0x19/0x20 21:44:04 ...: [ 482.520319] [<ffffffff810f591e>] read_cache_page+0xe/0x20 21:44:04 ...: [ 482.520327] [<ffffffff811a6cb0>] read_dev_sector+0x30/0xa0 21:44:04 ...: [ 482.520334] [<ffffffff811a7fcd>] amiga_partition+0x6d/0x460 21:44:04 ...: [ 482.520341] [<ffffffff811a7938>] check_partition+0x138/0x190 21:44:04 ...: [ 482.520348] [<ffffffff811a7a7a>] rescan_partitions+0xea/0x2f0 21:44:04 ...: [ 482.520355] [<ffffffff811744c7>] __blkdev_get+0x267/0x3d0 21:44:04 ...: [ 482.520361] [<ffffffff81174650>] ? blkdev_open+0x0/0xc0 21:44:04 ...: [ 482.520367] [<ffffffff81174640>] blkdev_get+0x10/0x20 21:44:04 ...: [ 482.520373] [<ffffffff811746c1>] blkdev_open+0x71/0xc0 21:44:04 ...: [ 482.520380] [<ffffffff811419f3>] __dentry_open+0x113/0x370 21:44:04 ...: [ 482.520388] [<ffffffff81253f8f>] ? security_inode_permission+0x1f/0x30 21:44:04 ...: [ 482.520396] [<ffffffff8114de3f>] ? inode_permission+0xaf/0xd0 21:44:04 ...: [ 482.520403] [<ffffffff81141d67>] nameidata_to_filp+0x57/0x70 21:44:04 ...: [ 482.520410] [<ffffffff8115207a>] do_filp_open+0x2da/0xba0 21:44:04 ...: [ 482.520417] [<ffffffff811134a8>] ? unmap_vmas+0x178/0x310 21:44:04 ...: [ 482.520426] [<ffffffff8115dbfa>] ? alloc_fd+0x10a/0x150 21:44:04 ...: [ 482.520432] [<ffffffff81141769>] do_sys_open+0x69/0x170 21:44:04 ...: [ 482.520438] [<ffffffff811418b0>] sys_open+0x20/0x30 21:44:04 ...: [ 482.520447] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b 21:44:04 ...: [ 482.520458] INFO: task mdadm:2283 blocked for more than 120 seconds. 21:44:04 ...: [ 482.520462] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:44:04 ...: [ 482.520467] mdadm D 0000000000000000 0 2283 2212 0x00000000 21:44:04 ...: [ 482.520475] ffff88002cca7d98 0000000000000086 0000000000015bc0 0000000000015bc0 21:44:04 ...: [ 482.520483] ffff88002ededf78 ffff88002cca7fd8 0000000000015bc0 ffff88002ededbc0 21:44:04 ...: [ 482.520490] 0000000000015bc0 ffff88002cca7fd8 0000000000015bc0 ffff88002ededf78 21:44:04 ...: [ 482.520498] Call Trace: 21:44:04 ...: [ 482.520508] [<ffffffff81543a97>] __mutex_lock_slowpath+0xf7/0x180 21:44:04 ...: [ 482.520515] [<ffffffff8154397b>] mutex_lock+0x2b/0x50 21:44:04 ...: [ 482.520521] [<ffffffff8117404d>] __blkdev_put+0x3d/0x190 21:44:04 ...: [ 482.520527] [<ffffffff811741b0>] blkdev_put+0x10/0x20 21:44:04 ...: [ 482.520533] [<ffffffff811741f3>] blkdev_close+0x33/0x60 21:44:04 ...: [ 482.520541] [<ffffffff81145375>] __fput+0xf5/0x210 21:44:04 ...: [ 482.520547] [<ffffffff811454b5>] fput+0x25/0x30 21:44:04 ...: [ 482.520554] [<ffffffff811415ad>] filp_close+0x5d/0x90 21:44:04 ...: [ 482.520560] [<ffffffff81141697>] sys_close+0xb7/0x120 21:44:04 ...: [ 482.520568] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b 21:44:04 ...: [ 482.520574] INFO: task md0_reshape:2287 blocked for more than 120 seconds. 21:44:04 ...: [ 482.520578] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:44:04 ...: [ 482.520582] md0_reshape D ffff88003aee96f0 0 2287 2 0x00000000 21:44:04 ...: [ 482.520590] ffff88003cf05a70 0000000000000046 0000000000015bc0 0000000000015bc0 21:44:04 ...: [ 482.520597] ffff88003aee9aa8 ffff88003cf05fd8 0000000000015bc0 ffff88003aee96f0 21:44:04 ...: [ 482.520605] 0000000000015bc0 ffff88003cf05fd8 0000000000015bc0 ffff88003aee9aa8 21:44:04 ...: [ 482.520612] Call Trace: 21:44:04 ...: [ 482.520623] [<ffffffffa0224892>] get_active_stripe+0x312/0x3f0 [raid456] 21:44:04 ...: [ 482.520633] [<ffffffff81059ae0>] ? default_wake_function+0x0/0x20 21:44:04 ...: [ 482.520643] [<ffffffffa0226f80>] reshape_request+0x4c0/0x9a0 [raid456] 21:44:04 ...: [ 482.520651] [<ffffffff81084790>] ? autoremove_wake_function+0x0/0x40 21:44:04 ...: [ 482.520661] [<ffffffffa022777a>] sync_request+0x31a/0x3a0 [raid456] 21:44:04 ...: [ 482.520668] [<ffffffff81052713>] ? __wake_up+0x53/0x70 21:44:04 ...: [ 482.520675] [<ffffffff814156b1>] md_do_sync+0x621/0xbb0 21:44:04 ...: [ 482.520685] [<ffffffff810387b9>] ? default_spin_lock_flags+0x9/0x10 21:44:04 ...: [ 482.520692] [<ffffffff8141640c>] md_thread+0x5c/0x130 21:44:04 ...: [ 482.520699] [<ffffffff81084790>] ? autoremove_wake_function+0x0/0x40 21:44:04 ...: [ 482.520705] [<ffffffff814163b0>] ? md_thread+0x0/0x130 21:44:04 ...: [ 482.520711] [<ffffffff81084416>] kthread+0x96/0xa0 21:44:04 ...: [ 482.520718] [<ffffffff810131ea>] child_rip+0xa/0x20 21:44:04 ...: [ 482.520725] [<ffffffff81084380>] ? kthread+0x0/0xa0 21:44:04 ...: [ 482.520730] [<ffffffff810131e0>] ? child_rip+0x0/0x20 21:44:04 ...: [ 482.520735] INFO: task mdadm:2288 blocked for more than 120 seconds. 21:44:04 ...: [ 482.520739] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:44:04 ...: [ 482.520743] mdadm D 0000000000000000 0 2288 1 0x00000000 21:44:04 ...: [ 482.520751] ffff88002cca9c18 0000000000000086 0000000000015bc0 0000000000015bc0 21:44:04 ...: [ 482.520759] ffff88003aee83b8 ffff88002cca9fd8 0000000000015bc0 ffff88003aee8000 21:44:04 ...: [ 482.520767] 0000000000015bc0 ffff88002cca9fd8 0000000000015bc0 ffff88003aee83b8 21:44:04 ...: [ 482.520774] Call Trace: 21:44:04 ...: [ 482.520782] [<ffffffff81543a97>] __mutex_lock_slowpath+0xf7/0x180 21:44:04 ...: [ 482.520790] [<ffffffff812a6d50>] ? exact_match+0x0/0x10 21:44:04 ...: [ 482.520797] [<ffffffff8154397b>] mutex_lock+0x2b/0x50 21:44:04 ...: [ 482.520804] [<ffffffff811742c8>] __blkdev_get+0x68/0x3d0 21:44:04 ...: [ 482.520810] [<ffffffff81174650>] ? blkdev_open+0x0/0xc0 21:44:04 ...: [ 482.520816] [<ffffffff81174640>] blkdev_get+0x10/0x20 21:44:04 ...: [ 482.520822] [<ffffffff811746c1>] blkdev_open+0x71/0xc0 21:44:04 ...: [ 482.520829] [<ffffffff811419f3>] __dentry_open+0x113/0x370 21:44:04 ...: [ 482.520837] [<ffffffff81253f8f>] ? security_inode_permission+0x1f/0x30 21:44:04 ...: [ 482.520843] [<ffffffff8114de3f>] ? inode_permission+0xaf/0xd0 21:44:04 ...: [ 482.520850] [<ffffffff81141d67>] nameidata_to_filp+0x57/0x70 21:44:04 ...: [ 482.520857] [<ffffffff8115207a>] do_filp_open+0x2da/0xba0 21:44:04 ...: [ 482.520864] [<ffffffff810ff0e1>] ? lru_cache_add_lru+0x21/0x40 21:44:04 ...: [ 482.520871] [<ffffffff8111109c>] ? do_anonymous_page+0x11c/0x330 21:44:04 ...: [ 482.520878] [<ffffffff81115d5f>] ? handle_mm_fault+0x31f/0x3c0 21:44:04 ...: [ 482.520885] [<ffffffff8115dbfa>] ? alloc_fd+0x10a/0x150 21:44:04 ...: [ 482.520891] [<ffffffff81141769>] do_sys_open+0x69/0x170 21:44:04 ...: [ 482.520897] [<ffffffff811418b0>] sys_open+0x20/0x30 21:44:04 ...: [ 482.520905] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b 21:46:04 ...: [ 602.520053] INFO: task mdadm:1937 blocked for more than 120 seconds. 21:46:04 ...: [ 602.520059] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:46:04 ...: [ 602.520065] mdadm D 00000000ffffffff 0 1937 1 0x00000000 21:46:04 ...: [ 602.520075] ffff88002ef4f5d8 0000000000000082 0000000000015bc0 0000000000015bc0 21:46:04 ...: [ 602.520084] ffff88002eb5b198 ffff88002ef4ffd8 0000000000015bc0 ffff88002eb5ade0 21:46:04 ...: [ 602.520091] 0000000000015bc0 ffff88002ef4ffd8 0000000000015bc0 ffff88002eb5b198 21:46:04 ...: [ 602.520099] Call Trace: 21:46:04 ...: [ 602.520127] [<ffffffffa0224892>] get_active_stripe+0x312/0x3f0 [raid456] 21:46:04 ...: [ 602.520142] [<ffffffff81059ae0>] ? default_wake_function+0x0/0x20 21:46:04 ...: [ 602.520153] [<ffffffffa0228413>] make_request+0x243/0x4b0 [raid456] 21:46:04 ...: [ 602.520162] [<ffffffffa0221a90>] ? release_stripe+0x50/0x70 [raid456] 21:46:04 ...: [ 602.520171] [<ffffffff81084790>] ? autoremove_wake_function+0x0/0x40 21:46:04 ...: [ 602.520180] [<ffffffff81414df0>] md_make_request+0xc0/0x130 21:46:04 ...: [ 602.520187] [<ffffffff81414df0>] ? md_make_request+0xc0/0x130 21:46:04 ...: [ 602.520197] [<ffffffff8129f8c1>] generic_make_request+0x1b1/0x4f0 21:46:04 ...: [ 602.520206] [<ffffffff810f6515>] ? mempool_alloc_slab+0x15/0x20 21:46:04 ...: [ 602.520215] [<ffffffff8116c2ec>] ? alloc_buffer_head+0x1c/0x60 21:46:04 ...: [ 602.520222] [<ffffffff8129fc80>] submit_bio+0x80/0x110 21:46:04 ...: [ 602.520229] [<ffffffff8116c849>] submit_bh+0xf9/0x140 21:46:04 ...: [ 602.520237] [<ffffffff8116f124>] block_read_full_page+0x274/0x3b0 21:46:04 ...: [ 602.520244] [<ffffffff81172c90>] ? blkdev_get_block+0x0/0x70 21:46:04 ...: [ 602.520252] [<ffffffff8110d875>] ? __inc_zone_page_state+0x35/0x40 21:46:04 ...: [ 602.520259] [<ffffffff810f46d8>] ? add_to_page_cache_locked+0xe8/0x160 21:46:04 ...: [ 602.520266] [<ffffffff81173d78>] blkdev_readpage+0x18/0x20 21:46:04 ...: [ 602.520273] [<ffffffff810f484b>] __read_cache_page+0x7b/0xe0 21:46:04 ...: [ 602.520279] [<ffffffff81173d60>] ? blkdev_readpage+0x0/0x20 21:46:04 ...: [ 602.520285] [<ffffffff81173d60>] ? blkdev_readpage+0x0/0x20 21:46:04 ...: [ 602.520292] [<ffffffff810f57dc>] do_read_cache_page+0x3c/0x120 21:46:04 ...: [ 602.520300] [<ffffffff810f5909>] read_cache_page_async+0x19/0x20 21:46:04 ...: [ 602.520306] [<ffffffff810f591e>] read_cache_page+0xe/0x20 21:46:04 ...: [ 602.520314] [<ffffffff811a6cb0>] read_dev_sector+0x30/0xa0 21:46:04 ...: [ 602.520321] [<ffffffff811a7fcd>] amiga_partition+0x6d/0x460 21:46:04 ...: [ 602.520328] [<ffffffff811a7938>] check_partition+0x138/0x190 21:46:04 ...: [ 602.520335] [<ffffffff811a7a7a>] rescan_partitions+0xea/0x2f0 21:46:04 ...: [ 602.520342] [<ffffffff811744c7>] __blkdev_get+0x267/0x3d0 21:46:04 ...: [ 602.520348] [<ffffffff81174650>] ? blkdev_open+0x0/0xc0 21:46:04 ...: [ 602.520354] [<ffffffff81174640>] blkdev_get+0x10/0x20 21:46:04 ...: [ 602.520359] [<ffffffff811746c1>] blkdev_open+0x71/0xc0 21:46:04 ...: [ 602.520367] [<ffffffff811419f3>] __dentry_open+0x113/0x370 21:46:04 ...: [ 602.520375] [<ffffffff81253f8f>] ? security_inode_permission+0x1f/0x30 21:46:04 ...: [ 602.520383] [<ffffffff8114de3f>] ? inode_permission+0xaf/0xd0 21:46:04 ...: [ 602.520390] [<ffffffff81141d67>] nameidata_to_filp+0x57/0x70 21:46:04 ...: [ 602.520397] [<ffffffff8115207a>] do_filp_open+0x2da/0xba0 21:46:04 ...: [ 602.520404] [<ffffffff811134a8>] ? unmap_vmas+0x178/0x310 21:46:04 ...: [ 602.520413] [<ffffffff8115dbfa>] ? alloc_fd+0x10a/0x150 21:46:04 ...: [ 602.520419] [<ffffffff81141769>] do_sys_open+0x69/0x170 21:46:04 ...: [ 602.520425] [<ffffffff811418b0>] sys_open+0x20/0x30 21:46:04 ...: [ 602.520434] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b 21:46:04 ...: [ 602.520443] INFO: task mdadm:2283 blocked for more than 120 seconds. 21:46:04 ...: [ 602.520447] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 21:46:04 ...: [ 602.520451] mdadm D 0000000000000000 0 2283 2212 0x00000000 21:46:04 ...: [ 602.520460] ffff88002cca7d98 0000000000000086 0000000000015bc0 0000000000015bc0 21:46:04 ...: [ 602.520468] ffff88002ededf78 ffff88002cca7fd8 0000000000015bc0 ffff88002ededbc0 21:46:04 ...: [ 602.520475] 0000000000015bc0 ffff88002cca7fd8 0000000000015bc0 ffff88002ededf78 21:46:04 ...: [ 602.520483] Call Trace: 21:46:04 ...: [ 602.520492] [<ffffffff81543a97>] __mutex_lock_slowpath+0xf7/0x180 21:46:04 ...: [ 602.520500] [<ffffffff8154397b>] mutex_lock+0x2b/0x50 21:46:04 ...: [ 602.520506] [<ffffffff8117404d>] __blkdev_put+0x3d/0x190 21:46:04 ...: [ 602.520512] [<ffffffff811741b0>] blkdev_put+0x10/0x20 21:46:04 ...: [ 602.520518] [<ffffffff811741f3>] blkdev_close+0x33/0x60 21:46:04 ...: [ 602.520526] [<ffffffff81145375>] __fput+0xf5/0x210 21:46:04 ...: [ 602.520533] [<ffffffff811454b5>] fput+0x25/0x30 21:46:04 ...: [ 602.520539] [<ffffffff811415ad>] filp_close+0x5d/0x90 21:46:04 ...: [ 602.520545] [<ffffffff81141697>] sys_close+0xb7/0x120 21:46:04 ...: [ 602.520552] [<ffffffff810121b2>] system_call_fastpath+0x16/0x1b

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• Apache load balancer limits with Tomcat over AJP

  - by PAS

  Hi All, I have Apache acting as a load balancer in front of 3 Tomcat servers. Occasionally, Apache returns 503 responses, which I would like to remove completely. All 4 servers are not under significant load in terms of CPU, memory, or disk, so I am a little unsure what is reaching it's limits or why. 503s are returned when all workers are in error state - whatever that means. Here are the details: Apache config: <IfModule mpm_prefork_module> StartServers 30 MinSpareServers 30 MaxSpareServers 60 MaxClients 200 MaxRequestsPerChild 1000 </IfModule> ... <Proxy *> AddDefaultCharset Off Order deny,allow Allow from all </Proxy> # Tomcat HA cluster <Proxy balancer://mycluster> BalancerMember ajp://10.176.201.9:8009 keepalive=On retry=1 timeout=1 ping=1 BalancerMember ajp://10.176.201.10:8009 keepalive=On retry=1 timeout=1 ping=1 BalancerMember ajp://10.176.219.168:8009 keepalive=On retry=1 timeout=1 ping=1 </Proxy> # Passes thru track. or api. ProxyPreserveHost On ProxyStatus On # Original tracker ProxyPass /m balancer://mycluster/m ProxyPassReverse /m balancer://mycluster/m Tomcat config: <Server port="8005" shutdown="SHUTDOWN"> <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" /> <Listener className="org.apache.catalina.core.JasperListener" /> <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" /> <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" /> <Service name="Catalina"> <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> <Engine name="Catalina" defaultHost="localhost"> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> </Engine> </Service> </Server> Apache error log: [Mon Mar 22 18:39:47 2010] [error] (70007)The timeout specified has expired: proxy: AJP: attempt to connect to 10.176.201.10:8009 (10.176.201.10) failed [Mon Mar 22 18:39:47 2010] [error] ap_proxy_connect_backend disabling worker for (10.176.201.10) [Mon Mar 22 18:39:47 2010] [error] proxy: AJP: failed to make connection to backend: 10.176.201.10 [Mon Mar 22 18:39:47 2010] [error] (70007)The timeout specified has expired: proxy: AJP: attempt to connect to 10.176.201.9:8009 (10.176.201.9) failed [Mon Mar 22 18:39:47 2010] [error] ap_proxy_connect_backend disabling worker for (10.176.201.9) [Mon Mar 22 18:39:47 2010] [error] proxy: AJP: failed to make connection to backend: 10.176.201.9 [Mon Mar 22 18:39:47 2010] [error] (70007)The timeout specified has expired: proxy: AJP: attempt to connect to 10.176.219.168:8009 (10.176.219.168) failed [Mon Mar 22 18:39:47 2010] [error] ap_proxy_connect_backend disabling worker for (10.176.219.168) [Mon Mar 22 18:39:47 2010] [error] proxy: AJP: failed to make connection to backend: 10.176.219.168 [Mon Mar 22 18:39:47 2010] [error] proxy: BALANCER: (balancer://mycluster). All workers are in error state [Mon Mar 22 18:39:47 2010] [error] proxy: BALANCER: (balancer://mycluster). All workers are in error state [Mon Mar 22 18:39:47 2010] [error] proxy: BALANCER: (balancer://mycluster). All workers are in error state [Mon Mar 22 18:39:47 2010] [error] proxy: BALANCER: (balancer://mycluster). All workers are in error state [Mon Mar 22 18:39:47 2010] [error] proxy: BALANCER: (balancer://mycluster). All workers are in error state [Mon Mar 22 18:39:47 2010] [error] proxy: BALANCER: (balancer://mycluster). All workers are in error state Load balancer top info: top - 23:44:11 up 210 days, 4:32, 1 user, load average: 0.10, 0.11, 0.09 Tasks: 135 total, 2 running, 133 sleeping, 0 stopped, 0 zombie Cpu(s): 0.1%us, 0.2%sy, 0.0%ni, 99.2%id, 0.1%wa, 0.0%hi, 0.1%si, 0.3%st Mem: 524508k total, 517132k used, 7376k free, 9124k buffers Swap: 1048568k total, 352k used, 1048216k free, 334720k cached Tomcat top info: top - 23:47:12 up 210 days, 3:07, 1 user, load average: 0.02, 0.04, 0.00 Tasks: 63 total, 1 running, 62 sleeping, 0 stopped, 0 zombie Cpu(s): 0.2%us, 0.0%sy, 0.0%ni, 99.8%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 2097372k total, 2080888k used, 16484k free, 21464k buffers Swap: 4194296k total, 380k used, 4193916k free, 1520912k cached Catalina.out does not have any error messages in it. According to Apache's server status, it seems to be maxing out at 143 requests/sec. I believe the servers can handle substantially more load than they are, so any hints about low default limits or other reasons why this setup would be maxing out would be greatly appreciated.

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• Optimizing apache server load

  - by Jevgeni Smirnov

  We have an issue with a dedicated server load. We have 16 processors with 4 core @ 2.40GHz, if I understood correctly cat /proc/cpuinfo output. Unfortunately, I don't have access to free -m or vmstat. But from top I got that we have 24 GB. And snapshot from top about processes: As far as I see, memory is not used at all. But the cpu is used heavily. Apache consumes most of CPU. Another useful piece of information: Every 1.0s: ps u -C httpd,mysqld,php Tue Mar 27 10:48:19 2012 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 7476 0.0 0.1 446808 37880 ? SNs Mar06 0:43 /opt/zone/sbin/httpd -D SSL -D SLOT_ID0 -f /etc/opt/zone/apache/ssl_httpd.conf mysql 36061 41.6 2.1 1113672 529876 ? SNl Feb20 21503:48 /opt/zone/sbin/mysqld --basedir=/opt/zone --datadir=/srvdata/mysql --user=mysql --log-error=/srvdata/mysql/dn79.err --pid-file=/srvdata/mysql/mysqld.pid --socket=/tmp/mysql.sock --port=3306 root 37257 0.0 0.0 424056 16840 ? SNs Mar22 1:03 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 52743 0.0 0.1 447100 30360 ? SN 10:40 0:00 /opt/zone/sbin/httpd -D SSL -D SLOT_ID0 -f /etc/opt/zone/apache/ssl_httpd.conf http 52744 0.0 0.1 447100 30360 ? SN 10:40 0:00 /opt/zone/sbin/httpd -D SSL -D SLOT_ID0 -f /etc/opt/zone/apache/ssl_httpd.conf http 52745 0.0 0.1 447100 30360 ? SN 10:40 0:00 /opt/zone/sbin/httpd -D SSL -D SLOT_ID0 -f /etc/opt/zone/apache/ssl_httpd.conf http 52746 0.0 0.1 447100 30360 ? SN 10:40 0:00 /opt/zone/sbin/httpd -D SSL -D SLOT_ID0 -f /etc/opt/zone/apache/ssl_httpd.conf http 52747 0.0 0.1 446956 30324 ? SN 10:40 0:00 /opt/zone/sbin/httpd -D SSL -D SLOT_ID0 -f /etc/opt/zone/apache/ssl_httpd.conf http 52980 69.1 1.8 852468 458088 ? RN 10:41 5:02 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 53483 47.0 0.8 615088 221040 ? RN 10:43 2:05 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 53641 1.8 0.2 446580 54632 ? SN 10:45 0:03 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54384 81.2 0.9 625828 229972 ? RN 10:45 2:14 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54411 47.7 0.5 535992 142416 ? RN 10:45 1:09 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54470 41.7 0.4 512528 120012 ? RN 10:46 0:54 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54475 0.1 0.1 437016 41528 ? SN 10:46 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54486 1.5 0.2 445636 53916 ? SN 10:46 0:02 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54531 2.5 0.2 445424 53012 ? SN 10:46 0:02 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54549 0.0 0.0 424188 9188 ? SN 10:46 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54642 0.0 0.0 424188 9200 ? SN 10:47 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54651 0.0 0.0 424188 9188 ? SN 10:47 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54661 0.0 0.0 424188 9208 ? SN 10:47 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54663 6.9 0.2 449936 58560 ? SN 10:47 0:03 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54666 6.0 0.2 453356 61124 ? SN 10:47 0:02 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54667 2.8 0.1 437608 42088 ? SN 10:47 0:01 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54670 1.5 0.1 437540 42172 ? SN 10:47 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54672 2.1 0.1 439076 43648 ? SN 10:47 0:01 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54709 0.0 0.0 424188 9192 ? SN 10:47 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54711 1.0 0.1 437284 41780 ? SN 10:47 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54712 11.8 0.2 448172 54700 ? SN 10:47 0:02 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54720 0.0 0.0 424188 9192 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54721 0.0 0.0 424188 9188 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54747 9.1 0.2 443568 51848 ? SN 10:48 0:01 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54782 1.8 0.1 438708 37896 ? RN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54784 0.0 0.0 424188 9180 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54785 0.0 0.0 424188 9188 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54789 0.0 0.0 424188 9188 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54790 0.0 0.0 424188 9188 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54791 0.0 0.0 424188 9188 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 http 54792 0.0 0.0 424056 8352 ? SN 10:48 0:00 /opt/zone/sbin/httpd -f /etc/opt/zone/apache/httpd.conf -D SLOT_ID0 Webalizer shows following: What can be done in the following situation? The application is Magento.

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• Small performance test on a web service

  - by vtortola

  Hi, I'm trying to develop a small application that test how many requests per second can my service support but I think I'm doing something wrong. The service is in an early development stage, but I'd like to have this test handy in order to check in time to time I'm not doing something that decrease the performance. The problem is that I cannot get the web server or the database server go to the 100% of CPU. I'm using three different computers, in one is the web server (WinSrv Standard 2008 x64 IIS7), in other the database (Win 2K - SQL Server 2005) and the last is my computer (Win7 x64 ultimate), where I'll run the test. The computers are connected through a 100 ethernet switch. The request POST is 9 bytes and the response will be 842 bytes. The test launches several threads, and each thread has a "while" loop, in each loop it creates a WebRequest object, performs a call, increment a common counter and waits between 1 and 5 millisencods, then it do it again: static Int32 counter = 0; static void Main(string[] args) { ServicePointManager.DefaultConnectionLimit = 250; Console.WriteLine("Ready. Press any key..."); Console.ReadKey(); Console.WriteLine("Running..."); String localhost = "localhost"; String linuxmono = "192.168.1.74"; String server= "192.168.1.5:8080"; DateTime start = DateTime.Now; Random r = new Random(DateTime.Now.Millisecond); for (int i = 0; i < 50; i++) { new Thread(new ParameterizedThreadStart(Test)).Start(server); Thread.Sleep(r.Next(1, 3)); } Thread.Sleep(2000); while (true) { Console.WriteLine("Request per second :" + counter/DateTime.Now.Subtract(start).TotalSeconds ); Thread.Sleep(3000); } } public static void Test(Object ip) { Guid guid = Guid.NewGuid(); Random r = new Random(DateTime.Now.Millisecond); while (true) { String test = "<lalala/>"; WebRequest req = WebRequest.Create("http://" + (String)ip + "/WebApp/"+guid.ToString()+"/Data/Tables=whatever"); req.Method = "POST"; req.ContentType = "application/xml"; req.Credentials = new NetworkCredential("aaa", "aaa","domain"); Byte[] array = Encoding.UTF8.GetBytes(test); req.ContentLength = array.Length; using (Stream reqStream = req.GetRequestStream()) { reqStream.Write(array, 0, array.Length); reqStream.Close(); } using (Stream responseStream = req.GetResponse().GetResponseStream()) { String response = new StreamReader(responseStream).ReadToEnd(); if (response.Length != 842) Console.Write(" EEEE "); } Interlocked.Increment(ref counter); Thread.Sleep(r.Next(1,5)); } } If I run the test neither of the computers do an excesive CPU usage. Let's say I get a X requests per second, if I run the console application two times at the same moment, I get X/2 request per second in each one... but still the web server is on 30% of CPU, the database server on 25%... I've tried to remove the thread.sleep in the loop, but it doesn't make a big difference. I'd like to put the machines to the maximun, to check how may requests per second they can provide. I guessed that I could do it in this way... but apparently I'm missing something here... What is the problem? Kind regards.

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• How to fix "ruby installation is missing psych (for YAML output)." on CentOS?

  - by ohho

  After rvm installation on CentOS 5.8: [rails@localhost ~]$ rvm -v rvm 1.16.17 [rails@localhost ~]$ which ruby ~/.rvm/rubies/ruby-1.9.3-p286/bin/ruby [rails@localhost ~]$ ruby -v ruby 1.9.3p286 (2012-10-12 revision 37165) [i686-linux] [rails@localhost ~]$ which gem ~/.rvm/rubies/ruby-1.9.3-p286/bin/gem there is a warning: $ gem -v /home/rails/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby. 1.8.24 I followed some advice: $ rvm pkg install libyaml Fetching yaml-0.1.4.tar.gz to /home/rails/.rvm/archives Extracting yaml-0.1.4.tar.gz to /home/rails/.rvm/src Prepare yaml in /home/rails/.rvm/src/yaml-0.1.4. Configuring yaml in /home/rails/.rvm/src/yaml-0.1.4. Compiling yaml in /home/rails/.rvm/src/yaml-0.1.4. Installing yaml to /home/rails/.rvm/usr Please note that it's required to reinstall all rubies: rvm reinstall all --force and then: $ rvm reinstall all --force Removing /home/rails/.rvm/src/ruby-1.8.7-p371... Removing /home/rails/.rvm/rubies/ruby-1.8.7-p371... No binary rubies available for: centos/5.8/i386/ruby-1.8.7-p371. Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies. Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.8.7-p371, this may take a while depending on your cpu(s)... ruby-1.8.7-p371 - #downloading ruby-1.8.7-p371, this may take a while depending on your connection... ruby-1.8.7-p371 - #extracting ruby-1.8.7-p371 to /home/rails/.rvm/src/ruby-1.8.7-p371 ruby-1.8.7-p371 - #extracted to /home/rails/.rvm/src/ruby-1.8.7-p371 Applying patch /home/rails/.rvm/patches/ruby/1.8.7/stdout-rouge-fix.patch Applying patch /home/rails/.rvm/patches/ruby/1.8.7/no_sslv2.diff ruby-1.8.7-p371 - #configuring ruby-1.8.7-p371 - #compiling ruby-1.8.7-p371 - #installing Removing old Rubygems files... Installing rubygems-1.8.24 for ruby-1.8.7-p371 ... Installation of rubygems completed successfully. Saving wrappers to '/home/rails/.rvm/bin'. ruby-1.8.7-p371 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake). ruby-1.8.7-p371 - #importing default gemsets (/home/rails/.rvm/gemsets/) Install of ruby-1.8.7-p371 - #complete Please be aware that you just installed a ruby that requires 2 patches just to be compiled on up to date linux system. This may have known and unaccounted for security vulnerabilities. Please consider upgrading to Ruby 1.9.3-286 which will have all of the latest security patches. Making gemset ruby-1.8.7-p371 pristine. Making gemset ruby-1.8.7-p371@global pristine. Removing /home/rails/.rvm/src/ruby-1.9.3-p286... Removing /home/rails/.rvm/rubies/ruby-1.9.3-p286... No binary rubies available for: centos/5.8/i386/ruby-1.9.3-p286. Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies. Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.9.3-p286, this may take a while depending on your cpu(s)... ruby-1.9.3-p286 - #downloading ruby-1.9.3-p286, this may take a while depending on your connection... ruby-1.9.3-p286 - #extracting ruby-1.9.3-p286 to /home/rails/.rvm/src/ruby-1.9.3-p286 ruby-1.9.3-p286 - #extracted to /home/rails/.rvm/src/ruby-1.9.3-p286 ruby-1.9.3-p286 - #configuring ruby-1.9.3-p286 - #compiling ruby-1.9.3-p286 - #installing Removing old Rubygems files... Installing rubygems-1.8.24 for ruby-1.9.3-p286 ... Installation of rubygems completed successfully. Saving wrappers to '/home/rails/.rvm/bin'. ruby-1.9.3-p286 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake). ruby-1.9.3-p286 - #importing default gemsets (/home/rails/.rvm/gemsets/) Install of ruby-1.9.3-p286 - #complete Making gemset ruby-1.9.3-p286 pristine. Making gemset ruby-1.9.3-p286@global pristine. Too bad, the warning is still there: $ gem -v /home/rails/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/yaml.rb:56:in `<top (required)>': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby. 1.8.24 How can I get rid of the warning? UPDATE: (applying rvm reinstall 1.9.3 --movable) $ rvm reinstall 1.9.3 --movable Removing /home/rails/.rvm/src/ruby-1.9.3-p286... Removing /home/rails/.rvm/rubies/ruby-1.9.3-p286... Fetching yaml-0.1.4.tar.gz to /home/rails/.rvm/archives Extracting yaml-0.1.4.tar.gz to /home/rails/.rvm/src Prepare yaml in /home/rails/.rvm/src/yaml-0.1.4. Configuring yaml in /home/rails/.rvm/src/yaml-0.1.4. Compiling yaml in /home/rails/.rvm/src/yaml-0.1.4. Installing yaml to /home/rails/.rvm/rubies/ruby-1.9.3-p286 Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.9.3-p286, this may take a while depending on your cpu(s)... ruby-1.9.3-p286 - #downloading ruby-1.9.3-p286, this may take a while depending on your connection... ruby-1.9.3-p286 - #extracting ruby-1.9.3-p286 to /home/rails/.rvm/src/ruby-1.9.3-p286 ruby-1.9.3-p286 - #extracted to /home/rails/.rvm/src/ruby-1.9.3-p286 Applying patch /home/rails/.rvm/patches/ruby/1.9.3/ruby-multilib.patch Error running 'patch -F 25 -p1 -N -f -i /home/rails/.rvm/patches/ruby/1.9.3/ruby-multilib.patch', please read /home/rails/.rvm/log/ruby-1.9.3-p286/patch.apply.ruby-multilib.log There has been an error applying the specified patches. Halting the installation. Making gemset ruby-1.9.3-p286 pristine. Making gemset ruby-1.9.3-p286@global pristine.

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• OS X 10.9 Mavericks Kernel Panics out of the box

  - by Kevin

  OS X Kernel panics after a fresh install of OS X 10.9 on a 17" Macbook Pro. Anonymous UUID: D002464D-24B7-C2B5-3D83-1C0B02873B29 Wed Oct 30 11:08:17 2013 panic(cpu 1 caller 0xffffff8006edc19e): Kernel trap at 0xffffff7f88e0a96c, type 14=page fault, registers: CR0: 0x000000008001003b, CR2: 0xffffef7f88e309b8, CR3: 0x0000000009c2d000, CR4: 0x0000000000000660 RAX: 0x0fffffd0c7b30000, RBX: 0xffffef7f88e309b0, RCX: 0x0000000000000001, RDX: 0x000002f384d06471 RSP: 0xffffff80eff03d80, RBP: 0xffffff80eff03e70, RSI: 0x0000031384cfb168, RDI: 0xffffff80e8f05148 R8: 0xffffff801b0f8670, R9: 0x0000000000000005, R10: 0x0000000000004a24, R11: 0x0000000000000202 R12: 0xffffff801938b800, R13: 0x0000000000000005, R14: 0xffffff80e8f05148, R15: 0xffffff7f88e2ee20 RFL: 0x0000000000010006, RIP: 0xffffff7f88e0a96c, CS: 0x0000000000000008, SS: 0x0000000000000010 Fault CR2: 0xffffef7f88e309b8, Error code: 0x0000000000000002, Fault CPU: 0x1 Backtrace (CPU 1), Frame : Return Address 0xffffff80eff03a10 : 0xffffff8006e22f69 0xffffff80eff03a90 : 0xffffff8006edc19e 0xffffff80eff03c60 : 0xffffff8006ef3606 0xffffff80eff03c80 : 0xffffff7f88e0a96c 0xffffff80eff03e70 : 0xffffff7f88e09b89 0xffffff80eff03f30 : 0xffffff8006edda5c 0xffffff80eff03f50 : 0xffffff8006e3757a 0xffffff80eff03f90 : 0xffffff8006e378c8 0xffffff80eff03fb0 : 0xffffff8006ed6aa7 Kernel Extensions in backtrace: com.apple.driver.AppleIntelCPUPowerManagement(216.0)[A6EE4D7B-228E-3A3C-95BA-10ED6F331236]@0xffffff7f88e07000->0xffffff7f88e31fff BSD process name corresponding to current thread: kernel_task Mac OS version: 13A603 Kernel version: Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64 Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393 Kernel slide: 0x0000000006c00000 Kernel text base: 0xffffff8006e00000 System model name: MacBookPro5,2 (Mac-F2268EC8) System uptime in nanoseconds: 4634353513870 last loaded kext at 39203945245: com.viscosityvpn.Viscosity.tun 1.0 (addr 0xffffff7f89200000, size 32768) last unloaded kext at 147930318702: com.apple.driver.AppleFileSystemDriver 3.0.1 (addr 0xffffff7f89110000, size 8192) loaded kexts: com.viscosityvpn.Viscosity.tun 1.0 com.viscosityvpn.Viscosity.tap 1.0 com.apple.driver.AudioAUUC 1.60 com.apple.driver.AppleHWSensor 1.9.5d0 com.apple.filesystems.autofs 3.0 com.apple.iokit.IOBluetoothSerialManager 4.2.0f6 com.apple.driver.AGPM 100.14.11 com.apple.driver.AppleMikeyHIDDriver 124 com.apple.driver.AppleHDA 2.5.2fc2 com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.0f6 com.apple.GeForceTesla 8.1.8 com.apple.driver.AppleMikeyDriver 2.5.2fc2 com.apple.iokit.IOUserEthernet 1.0.0d1 com.apple.driver.AppleUpstreamUserClient 3.5.13 com.apple.driver.AppleMuxControl 3.4.12 com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0 com.apple.driver.AppleSMCLMU 2.0.4d1 com.apple.Dont_Steal_Mac_OS_X 7.0.0 com.apple.driver.AppleHWAccess 1 com.apple.driver.AppleMCCSControl 1.1.12 com.apple.driver.AppleLPC 1.7.0 com.apple.driver.SMCMotionSensor 3.0.4d1 com.apple.driver.AppleUSBTCButtons 240.2 com.apple.driver.AppleUSBTCKeyboard 240.2 com.apple.driver.AppleIRController 325.7 com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1 com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1 com.apple.BootCache 35 com.apple.iokit.SCSITaskUserClient 3.6.0 com.apple.driver.XsanFilter 404 com.apple.iokit.IOAHCIBlockStorage 2.4.0 com.apple.driver.AppleUSBHub 650.4.4 com.apple.driver.AppleUSBEHCI 650.4.1 com.apple.driver.AppleFWOHCI 4.9.9 com.apple.driver.AirPort.Brcm4331 700.20.22 com.apple.driver.AppleAHCIPort 2.9.5 com.apple.nvenet 2.0.21 com.apple.driver.AppleUSBOHCI 650.4.1 com.apple.driver.AppleSmartBatteryManager 161.0.0 com.apple.driver.AppleRTC 2.0 com.apple.driver.AppleHPET 1.8 com.apple.driver.AppleACPIButtons 2.0 com.apple.driver.AppleSMBIOS 2.0 com.apple.driver.AppleACPIEC 2.0 com.apple.driver.AppleAPIC 1.7 com.apple.driver.AppleIntelCPUPowerManagementClient 216.0.0 com.apple.nke.applicationfirewall 153 com.apple.security.quarantine 3 com.apple.driver.AppleIntelCPUPowerManagement 216.0.0 com.apple.kext.triggers 1.0 com.apple.iokit.IOSerialFamily 10.0.7 com.apple.AppleGraphicsDeviceControl 3.4.12 com.apple.driver.DspFuncLib 2.5.2fc2 com.apple.vecLib.kext 1.0.0 com.apple.iokit.IOAudioFamily 1.9.4fc11 com.apple.kext.OSvKernDSPLib 1.14 com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.0f6 com.apple.iokit.IOSurface 91 com.apple.iokit.IOBluetoothFamily 4.2.0f6 com.apple.nvidia.classic.NVDANV50HalTesla 8.1.8 com.apple.driver.AppleSMBusPCI 1.0.12d1 com.apple.driver.AppleGraphicsControl 3.4.12 com.apple.driver.IOPlatformPluginLegacy 1.0.0 com.apple.driver.AppleBacklightExpert 1.0.4 com.apple.iokit.IOFireWireIP 2.2.5 com.apple.driver.AppleHDAController 2.5.2fc2 com.apple.iokit.IOHDAFamily 2.5.2fc2 com.apple.driver.AppleSMBusController 1.0.11d1 com.apple.nvidia.classic.NVDAResmanTesla 8.1.8 com.apple.driver.IOPlatformPluginFamily 5.5.1d27 com.apple.iokit.IONDRVSupport 2.3.6 com.apple.iokit.IOGraphicsFamily 2.3.6 com.apple.driver.AppleSMC 3.1.6d1 com.apple.driver.AppleUSBMultitouch 240.6 com.apple.iokit.IOUSBHIDDriver 650.4.4 com.apple.driver.AppleUSBMergeNub 650.4.0 com.apple.driver.AppleUSBComposite 650.4.0 com.apple.driver.CoreStorage 380 com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.6.0 com.apple.iokit.IOBDStorageFamily 1.7 com.apple.iokit.IODVDStorageFamily 1.7.1 com.apple.iokit.IOCDStorageFamily 1.7.1 com.apple.iokit.IOAHCISerialATAPI 2.6.0 com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.0 com.apple.iokit.IOUSBUserClient 650.4.4 com.apple.iokit.IOFireWireFamily 4.5.5 com.apple.iokit.IO80211Family 600.34 com.apple.iokit.IOAHCIFamily 2.6.0 com.apple.iokit.IONetworkingFamily 3.2 com.apple.iokit.IOUSBFamily 650.4.4 com.apple.driver.NVSMU 2.2.9 com.apple.driver.AppleEFINVRAM 2.0 com.apple.driver.AppleEFIRuntime 2.0 com.apple.iokit.IOHIDFamily 2.0.0 com.apple.iokit.IOSMBusFamily 1.1 com.apple.security.sandbox 278.10 com.apple.kext.AppleMatch 1.0.0d1 com.apple.security.TMSafetyNet 7 com.apple.driver.AppleKeyStore 2 com.apple.driver.DiskImages 371.1 com.apple.iokit.IOStorageFamily 1.9 com.apple.iokit.IOReportFamily 21 com.apple.driver.AppleFDEKeyStore 28.30 com.apple.driver.AppleACPIPlatform 2.0 com.apple.iokit.IOPCIFamily 2.8 com.apple.iokit.IOACPIFamily 1.4 com.apple.kec.pthread 1 com.apple.kec.corecrypto 1.0 System Profile: Model: MacBookPro5,2, BootROM MBP52.008E.B05, 2 processors, Intel Core 2 Duo, 2.8 GHz, 8 GB, SMC 1.42f4 Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB Graphics: NVIDIA GeForce 9600M GT, NVIDIA GeForce 9600M GT, PCIe, 512 MB Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x04CD, 0x46332D3130363636434C392D344742535100 Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x04CD, 0x46332D3130363636434C392D344742535100 AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.106.98.100.22) Bluetooth: Version 4.2.0f6 12982, 3 services, 15 devices, 1 incoming serial ports Network Service: Wi-Fi, AirPort, en1 Serial ATA Device: Samsung SSD 840 Series, 120.03 GB Serial ATA Device: MATSHITADVD-R UJ-868 USB Device: Built-in iSight USB Device: BRCM2046 Hub USB Device: Bluetooth USB Host Controller USB Device: Apple Internal Keyboard / Trackpad USB Device: IR Receiver Thunderbolt Bus:

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• Need help diagnosing network performance issues

  - by tokes

  I am currently working in a developing country as a system analyst for a government department. My area of expertise is software projects, but I've come across a few issues with the network setup in my office. (Unfortunately, being a developing country, there's not a lot of professional help available for this sort of thing.) Most recently, I am trying to diagnose a problem with slowness on the network. Our office is connected to the internet via an ADSL wireless modem/router (called Router). The modem is connected via ethernet to a switch (called Switch). The modem also acts as a wireless access point (called Wireless1), though because it is in a room at the end of the floor, it's range is limited. There are ethernet ports installed around the office. The cables of these all lead back to the same switch. In closer vicinity to the bulk of the client computers, there is another wireless router that acts as an access point for those clients (called Wireless2). That router is connected via ethernet to a wall port, and therefore to Switch. There is also a Windows server which acts as a DNS server (called DNSBox) which is located in the same room and is connected directly to Switch. ---Internet----------| Router/Wireless1 192.168.10.1 ---------------| |----|=========| DNSBox | |-------------------- 192.168.10.4 --------------------| Switch |---Other clients---- | |-------------------- |----|=========| Wireless2 ------------------| 192.168.10.198 One final thing to mention about the network setup. All clients are configured with manual IP addresses. Their router/gateway is set to the IP address of Router, and their DNS server is set to the IP address of DNSBox (with a secondary IP set to an external IP - that of our ISP's DNS server). Here are the symptoms we are experiencing: Clients connected to Wireless2 AP experience slow and unstable connections to the internet. (Slow here is defined as speeds of ~1KB/s, though ping response times seem to be as normal.) Clients connected via ethernet to Switch also experience the same slowness. Clients connected to Wireless1 AP (i.e. connecting via wireless directly to the ADSL modem) experience normal connections to the internet. Clients connected via ethernet to Router (i.e. connecting via ethernet directly to the ADSL modem) also experience normal connections to the internet. I also tried to gauge the connection performance between two machines on the network via ethernet: A file transfer between two clients who were both directly connected to Switch was the fastest; A file transfer between one client directly connected to Switch, and one client directly connected to Router (which is directly connected to Switch) performed much slower; A file transfer between two clients directly connected to Router also performed slowly. Things I have attempted to diagnose the problem: Restarted Switch -- no change. We tried unplugging ethernet jacks from Switch 4 at a time and testing the internet connection. The thought here was that perhaps a client on the network has contracted a virus, and is possibly spamming the network with traffic? (Not very technical, I know.) Unfortunately we couldn't get any significant increases in performance using this method. There were a couple of times when it seemed to be better, but then the connection speed quickly dropped back to slow/dead pace. I didn't want to unplug all jacks from Switch because I was concerned that users might be affected or that I would re-plug in the jacks incorrectly (should I even be worried about that? a port is a port on a switch, right?) I tried swapping the ethernet cable used to connect Router to Switch -- no change in performance. I tried swapping the port used on Switch for Router -- no change in performance. Anyone got any ideas on what this could be? Should I be mentioning specific brand names/models of the hardware used? Virii outbreaks are common in this country/office -- what could I be doing to figure out if a virus is at fault? If it is a virus, it doesn't seem to be generating a lot of traffic to/from the internet, because a) I can still get a good speed if I am directly connected to Router / Wireless1 and b) our ISP data usage has not risen suspiciously. Thanks for your help! Update #1 Here are the specs of some of the hardware: Switch is an Edimax ES3132RL 32-Port 10/100 Rackmount Switch Router is a D-Link DSL-G604T Update #2 I just tried unplugging everything except a laptop and Router from Switch. Speeds are still slow. I guess that means that Router / Switch are not being flooded? It seems more and more likely that the cause is something to do with the interaction between Router and Switch. However, I still can't find any useful resources on setting the LAN speed for either (and I'm not well-versed in these advanced networking configurations).

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• MySQL is hogging my server resources

  - by Reacen

  Does anyone have any idea of what can cause this weird behaviour and how I go about fixing it? This is all coming from MySQL only (both RAM and CPU usage), for about 10 minutes after I reboot my Java game server (that has a pool of 256 connections). There are not that many queries and I think it may be more of a MySQL misconfiguration problem. My server: 3.20 GHz * 6 core / 24 GB RAM / 64 bit Windows Server 2003. My game server: Java server, with 256 MySQL connections pool (MyISAM engine), about 500,000 accounts, and 9 million rows of game items in database and about 3,000 players are connected. After about 15 minutes of the game server reboot, the server resumes its stability and CPU usage drop down to 1% ~ 5% and memory to 6 GB. Here is a copy of my MySQL configuration. Also, any advice about my MySQL configuration will be appreciated. I really set it up almost at random. # Example MySQL config file for very large systems. # # This is for a large system with memory of 1G-2G where the system runs mainly # MySQL. # # You can copy this file to # /etc/my.cnf to set global options, # mysql-data-dir/my.cnf to set server-specific options (in this # installation this directory is C:\mysql\data) or # ~/.my.cnf to set user-specific options. # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the "--help" option. # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /tmp/mysql.sock # Here follows entries for some specific programs # The MySQL server [mysqld] #log=c:\mysql.log port = 3306 socket = /tmp/mysql.sock skip-locking key_buffer_size = 2572M max_allowed_packet = 64M table_open_cache = 512 sort_buffer_size = 128M read_buffer_size = 128M read_rnd_buffer_size = 128M myisam_sort_buffer_size = 500M thread_cache_size = 32 query_cache_size = 1948M # Try number of CPU's*2 for thread_concurrency thread_concurrency = 12 max_connections = 5000 # Don't listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host. # All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows # (via the "enable-named-pipe" option) will render mysqld useless! # #skip-networking # Replication Master Server (default) # binary logging is required for replication log-bin=mysql-bin # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function as a master if omitted server-id = 1 # Replication Slave (comment out master section to use this) # # To configure this host as a replication slave, you can choose between # two methods : # # 1) Use the CHANGE MASTER TO command (fully described in our manual) - # the syntax is: # # CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>, # MASTER_USER=<user>, MASTER_PASSWORD=<password> ; # # where you replace <host>, <user>, <password> by quoted strings and # <port> by the master's port number (3306 by default). # # Example: # # CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, # MASTER_USER='joe', MASTER_PASSWORD='secret'; # # OR # # 2) Set the variables below. However, in case you choose this method, then # start replication for the first time (even unsuccessfully, for example # if you mistyped the password in master-password and the slave fails to # connect), the slave will create a master.info file, and any later # change in this file to the variables' values below will be ignored and # overridden by the content of the master.info file, unless you shutdown # the slave server, delete master.info and restart the slaver server. # For that reason, you may want to leave the lines below untouched # (commented) and instead use CHANGE MASTER TO (see above) # # required unique id between 2 and 2^32 - 1 # (and different from the master) # defaults to 2 if master-host is set # but will not function as a slave if omitted #server-id = 2 # # The replication master for this slave - required #master-host = <hostname> # # The username the slave will use for authentication when connecting # to the master - required #master-user = <username> # # The password the slave will authenticate with when connecting to # the master - required #master-password = <password> # # The port the master is listening on. # optional - defaults to 3306 #master-port = <port> # # binary logging - not required for slaves, but recommended #log-bin=mysql-bin # # binary logging format - mixed recommended #binlog_format=mixed # Point the following paths to different dedicated disks #tmpdir = /tmp/ #log-update = /path-to-dedicated-directory/hostname # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = C:\mysql\data/ #innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend #innodb_log_group_home_dir = C:\mysql\data/ # You can set .._buffer_pool_size up to 50 - 80 % # of RAM but beware of setting memory usage too high #innodb_buffer_pool_size = 384M #innodb_additional_mem_pool_size = 20M # Set .._log_file_size to 25 % of buffer pool size #innodb_log_file_size = 100M #innodb_log_buffer_size = 8M #innodb_flush_log_at_trx_commit = 1 #innodb_lock_wait_timeout = 50 [mysqldump] quick max_allowed_packet = 64M [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL #safe-updates [myisamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 8M write_buffer = 8M [mysqlhotcopy] interactive-timeout

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• java.lang.RuntimeException: Unable to start activity ComponentInfo cannot be cast to android.widget.ZoomControls

  - by Hwl

  I'm new to android development, hope you all can help me. I got this androidVNC viewer source code from internet. When i'm running the androidVNC application in the emulator, it will exit automatically then i get following errors in LogCat. Can anyone one help me? Thanks. FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{android.androidVNC/android.androidVNC.VncCanvasActivity}: java.lang.ClassCastException: com.antlersoft.android.zoomer.ZoomControls cannot be cast to android.widget.ZoomControls at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) at android.app.ActivityThread.access$600(ActivityThread.java:122) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4340) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassCastException: com.antlersoft.android.zoomer.ZoomControls cannot be cast to android.widget.ZoomControls at android.androidVNC.VncCanvasActivity.onCreate(VncCanvasActivity.java:585) at android.app.Activity.performCreate(Activity.java:4465) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) ... 11 more This is the ZoomControls java file: package com.antlersoft.android.zoomer; import android.content.Context; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.animation.AlphaAnimation; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.ZoomButton; public class ZoomControls extends LinearLayout { private final ZoomButton mZoomIn; private final ZoomButton mZoomOut; private final ImageButton mZoomKeyboard; public ZoomControls(Context context) { this(context, null); } public ZoomControls(Context context, AttributeSet attrs) { super(context, attrs); setFocusable(false); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); inflater.inflate(R.layout.zoom_controls, this, // we are the parent true); mZoomIn = (ZoomButton) findViewById(R.id.zoomIn); mZoomOut = (ZoomButton) findViewById(R.id.zoomOut); mZoomKeyboard = (ImageButton) findViewById(R.id.zoomKeys); } public void setOnZoomInClickListener(OnClickListener listener) { mZoomIn.setOnClickListener(listener); } public void setOnZoomOutClickListener(OnClickListener listener) { mZoomOut.setOnClickListener(listener); } public void setOnZoomKeyboardClickListener(OnClickListener listener) { mZoomKeyboard.setOnClickListener(listener); } /* * Sets how fast you get zoom events when the user holds down the * zoom in/out buttons. */ public void setZoomSpeed(long speed) { mZoomIn.setZoomSpeed(speed); mZoomOut.setZoomSpeed(speed); } @Override public boolean onTouchEvent(MotionEvent event) { /* Consume all touch events so they don't get dispatched to the view * beneath this view. */ return true; } public void show() { fade(View.VISIBLE, 0.0f, 1.0f); } public void hide() { fade(View.GONE, 1.0f, 0.0f); } private void fade(int visibility, float startAlpha, float endAlpha) { AlphaAnimation anim = new AlphaAnimation(startAlpha, endAlpha); anim.setDuration(500); startAnimation(anim); setVisibility(visibility); } public void setIsZoomInEnabled(boolean isEnabled) { mZoomIn.setEnabled(isEnabled); } public void setIsZoomOutEnabled(boolean isEnabled) { mZoomOut.setEnabled(isEnabled); } @Override public boolean hasFocus() { return mZoomIn.hasFocus() || mZoomOut.hasFocus(); } } This is the zoom_controls XML file: <merge xmlns:android="http://schemas.android.com/apk/res/android"> <ZoomButton android:id="@+id/zoomOut" android:background="@drawable/btn_zoom_down" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <ImageButton android:id="@+id/zoomKeys" android:background="@android:drawable/ic_dialog_dialer" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <ZoomButton android:id="@+id/zoomIn" android:background="@drawable/btn_zoom_up" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </merge>

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