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• How can I simulate a slow machine in a VM?

  - by Nathan Long

  I'm testing an AJAX-heavy web-application. I develop on a new Mac, but I use VmWare Fusion (currently 3.1.2) to test in Windows XP, using IETester to simulate older versions of IE. This lets me see how older IE versions would render the site, but I'd also like to see how the site would perform on an older machine. I see in the VM's settings that I can decrease the RAM; is there a way to also dial down the processor speed? How else might I simulate a slow machine? (I am also going to check out how to simulate a slow internet connection.)

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• Why change net.inet.tcp.tcbhashsize in FreeBSD?

  - by sh-beta

  In virtually every FreeBSD network tuning document I can find: # /boot/loader.conf net.inet.tcp.tcbhashsize=4096 This is usually paired with some unhelpful statement like "TCP control-block hash table tuning" or "Set this to a reasonable value." man 4 tcp isn't much help either: tcbhashsize Size of the TCP control-block hash table (read-only). This may be tuned using the kernel option TCBHASHSIZE or by setting net.inet.tcp.tcbhashsize in the loader(8). The only document I can find that touches on this mysterious thing is the Protocol Control Block Lookup subsection beneath Transport Layer in Optimizing the FreeBSD IP and TCP Stack, but its description is more about potential bottlenecks in using it. It seems tied to matching new TCP segments to their listening sockets, but I'm not sure how. What exactly is the TCP Control Block used for? Why would you want to set its hash size to 4096 or any other particular number?

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• All-on-one-page print view in Plone

  - by Kev

  We have a Plone 4 document that is in a hierarchy. At each node there's either a document, or a folder. Folders then have more documents and folders. We want to be able to print the entire hierarchy, which means rendering the whole thing on one page. I see a number of web sites like this one that seem to have something like this. Is it manually done or is there some add-on I can get to make this feature possible?

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• Email server for huge number of subscriber

  - by bogha

  My question is that my company is thinking of providing a free email account for each of its customers. As a new company we will assume that our corporate email system will be MS Exchange server which will support about 1000 employees. They are asking why not adding the customer list to be a part of Exchange users. My suggestion was to separate the two systems, for the corporate we can use Exchange but for customers (around 30000) we have to use a Linux based system. My only argument was that Linux can be used for enterprise services like this and Microsoft may fail. What do you suggest? And if you are with me on choosing Linux as the server platform, what do you suggest to use as an alternative for Exchange in Linux? Thank you.

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• Where do vendors publish internal transfer rates of HDDs?

  - by red888

  So I've started to dig into storage fundamentals and found that in order to calculate the IOPS of a HDD you need to know the internal transfer rate of the drive (time it takes data to move from the platters to internal disk's cache). I went on newegg and even a few vendor sites and could not find this info published for any HDDs. Is it sometimes called something else? Take this link to a seagate HDD for instance. Nowhere do I see "internal transfer rate", but I do see something called "Sustained Data Rate OD"- is that the same thing? Just so you know where I'm getting this info (Book: "Information Storage and Management Storing, Managing..."): Consider an example with the following specifications provided for a disk: The average seek time is 5 ms in a random I/O environment; therefore, T = 5 ms. Disk rotation speed of 15,000 revolutions per minute or 250 revolutions per second — from which rotational latency (L) can be determined, which is one-half of the time taken for a full rotation or L = (0.5/250 rps expressed in ms). 40 MB/s internal data transfer rate, from which the internal transfer time (X) is derived based on the block size of the I/O — for example, an I/O with a block size of 32 KB; therefore X = 32 KB/40 MB. Consequently, the time taken by the I/O controller to serve an I/O of block size 32 KB is (TS) = 5 ms + (0.5/250) + 32 KB/40 MB = 7.8 ms. Therefore, the maximum number of I/Os serviced per second or IOPS is (1/TS) = 1/(7.8 × 10^-3) = 128 IOPS.

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• Firefox takes a really long time to load some sites on Ubuntu

  - by Dave

  Hello guys, I have an issue here. Some sites - just a few - takes a really long time to load on Firefox. One example is A List Apart (http://www.alistapart.com/) which takes more than 30 minutes (yes, minutes, not seconds). On Opera, ou even through a telnet session, the problematic sites run without problem, fast as expected. I am using Linux 8.04, running Firefox 3.6.3 downloaded from mozilla site, with a 10M ADSL connection. I tried many tweaks I found googling, like disable IPv6, and change http pipelining settings on FF's about:config. None worked. I also used Firebug to find what phase during negotiation is the bottleneck. Findings are in the screenshot. Well guys, any idea what is the issue? And how to solve it? I repeat, this only happens with firefox (3.6.3 and prior versions), for a few sites only (even sites with much more requests, images, javascripts, stylesheets work fine), and http pipelines and IPv6 tweaks on about:config didn't work. Thanks

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• windows 2000 freezing during large disk write

  - by robert

  We have a windows 2000 sp4 server which freezes up for about 1 minutes while its web-app does a ~500mb write operation. I can see the webapp start to do I/O activity (through process explorer) then the RDP session becomes unresponsive, you can click on windows and buttons but nothing happens. When the disk write finally finishes the session 'catches up' on all the mouse clicks you did during the freeze in a mad flurry of window activity and the server returns to normal. During the freeze the web-app stops as well. The same behaviour happens on the console of the server. (so I know its not a network thing) Nothing appears in the Event logs. Its like nothing happened. I have upgraded all the HP hardware drivers to the latest proliant support pack. And also run a HP hardware diagnostics which found nothing wrong. What would cause a disk write to lock the rest of the OS?

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• On wordpress.com how to set a category as front page?

  - by Shashank Sawant

  I first referred to a link explaining how to set a page as your front page. What I want is to set a category of my blogs as my front page display. Hoping for an answer, I went to the following link: http://en.forums.wordpress.com/topic/1-category-as-front-page?replies=4 It effectively redirects me to my first link. Though I can make a page on wordpress.com and set it as my front page, I still haven't understood how to set one of my blog categories as my front display.

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• Should I use "Raid 5 + spare" or "Raid 6"?

  - by Trevor Boyd Smith

  What is "Raid 5 + Spare" (excerpt from User Manual, Sect 4.17.2, P.54): RAID5+Spare: RAID 5+Spare is a RAID 5 array in which one disk is used as spare to rebuild the system as soon as a disk fails (Fig. 79). At least four disks are required. If one physical disk fails, the data remains available because it is read from the parity blocks. Data from a failed disk is rebuilt onto the hot spare disk. When a failed disk is replaced, the replacement becomes the new hot spare. No data is lost in the case of a single disk failure, but if a second disk fails before the system can rebuild data to the hot spare, all data in the array will be lost. What is "Raid 6" (excerpt from User Manual, Sect 4.17.2, P.54): RAID6: In RAID 6, data is striped across all disks (minimum of four) and a two parity blocks for each data block (p and q in Fig. 80) is written on the same stripe. If one physical disk fails, the data from the failed disk can be rebuilt onto a replacement disk. This Raid mode can support up to two disk failures with no data loss. RAID 6 provides for faster rebuilding of data from a failed disk. Both "Raid 5 + spare" and "Raid 6" are SO similar ... I can't tell the difference. When would "Raid 5 + Spare" be optimal? And when would "Raid 6" be optimal"? The manual dumbs down the different raid with 5 star ratings. "Raid 5 + Spare" only gets 4 stars but "Raid 6" gets 5 stars. If I were to blindly trust the manual I would conclude that "Raid 6" is always better. Is "Raid 6" always better?

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• Why does the number and the paragraph split up at the top a page in MS Word?

  - by Geoffrey van Wyk

  This happens when I insert a page break at the end of a page 1, say. The number of the first paragraph on the next page, page 2, appears next to the Page Break line at the bottom of page 1. This happens in both Word 2003 and 2007.

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• How to configure an ASUS motherboard.

  - by Absolute0

  I have an ASUS P7P55-M motherboard running with an Intel Core i5-750 processor and 4 GB RAM with 1600 MT/s speed. For some reason the default settings of the motherboard make all the components run at half their optimums. I have switched to the "D.O.C.P." profile and supposedly everything is as it's supposed to be (verified with CPU-Z). There is also an "X.M.P." profile and a manual one. Are either of the DOCP or XMP safe to go with? I wouldn't use the manual mode as I would likely mess something up real bad. XMP seems to be more memory oriented.

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• Weblogic Threads Usage

  - by Hila

  I have an application deployed on WebLogic 10.3, which exhibits a strange behavior. I am running a constant (not too high) load on my application (20 concurrent users, running a light activity). The response time is reasonable (well below 100ms after the application stabilizes) Memory consumption seems fine (My application creates a lot of short-living objects, but they are garbaged collected so the overall memory consumption stays under 500 mb). Threads stats seem healthy as well: And yet, after I leave my test running for a while, more and more execute threads ("[ACTIVE] ExecuteThread: '3' for queue: 'weblogic.kernel.Default (self-tuning)'") are created, until eventually the application crashes: This test hasn't been running for a long time (All the new threads that you don't see in the first screenshot were created while I was writing this question), and I've seen much more threads being created. Any idea why these threads are being created?

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• MySQL Locking Up

  - by Ian

  I've got a innodb table that gets a lot of reads and almost no writes (like, 1 write for every 400,000 reads approx). I'm running into a pretty big problem though when I do INSERT into the table. MySQL completely locks up. It uses 100% cpu, and every single other table (in other databases even) have their statuses set to "Locked" until the INSERT is done. This is a big problem because MySQL stays locked up for up to 4 minutes. I'm using version 5.1.47 (rpm from mysql.com). Any ideas?

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• Run serveral daemon using python

  - by ylc

  I noticed that serveral daemon invoked python seperately. For example, I have both wicd and ibus daemon running on my machine. Instead of launching a single instance of python, the daemons run with two python instance at the same time in htop: /usr/bin/python2 -O /usr/share/wicd/daemon/monitor.py python2 /usr/share/ibus/ui/gtk/main.py Is it a waste of doing that? If yes, how can I improve this? If no, why avoid putting all daemons run on a single python instance?

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• Flash stream makes my internet slow and cpu rush

  - by user1225840

  When I try to watch a live Flash stream, my CPU usage goes up to 75% and my Internet speed goes down. If I run a test before the video-stream, my speed is ~40/10Mbps and during the stream it drops to 0.1-0.5Mbps. The stream is laggy and I can only watch one to two seconds at a time, start/stop/start/stop. I have cleared my history, cache, cookies, temp files, and so on. I have searched for malware and took care of that. I have updated my drivers, reinstalled Flash and everything else I can think of, but it remains slow. I had this problem before and it just started working normally from one day to another. Could it be a hardware problem?

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• Identify Long Running or Slow PHP Scripts

  - by Kirk

  I have web server that is getting around 25K visits a day up at yougetsignal.com. Sometimes the site feels a bit sluggish. I am hosting it on nginx with php5-fpm. Is there a way for me to see a list of all of the long running requests that are coming to the site? I'd love to have a real-time list of all of the active requests that PHP is handling and how long they have been running. Kind of like top, but just for the web server. This would let me know how long requests are taking and which script is the culprit. Anyone have any ideas on how I can do this?

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• Brand new Seagate HDD has high raw read error rate

  - by kpax

  I've just purchased a brand new Seagate ST31000524AS 1TB HDD. Manufacture date shows as January 2012 (yes that's as new as new can get), so must be one of the new batches from the post-flood Thailand. Anyway, I downloaded a copy of Active Hard Disk Monitor tool to check the S.M.A.R.T. parameters and I find the parameter Raw Read Error Rate is very low. Should I be worried? Will this rectify over time? This hdd is just 7 hours old; what gives? Edit: I meant high raw read error rate - Title updated accordingly

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• Monitoring User Login time

  - by beakersoft

  Hi, i have recently been given the task of trying to work out why the login time (not machine boot time) for some of our users seems slow. The vast majority of clients (95%) are running on XP sp3, Windows 2003 domain controlers. Most users have the same model of machine. I would like to be able to see how long each of the polices are taking to load (if possable split user and computer) and any other info that might help (services starting etc) I changed the userenvdebuglevel reg option to generate the userenv.log file but it did'nt contain very much info Thanks Luke

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• Is there a way to have a working search bar in Explorer with Windows Search Service disabled?

  - by Desmond Hume

  I had to disable Windows Search Service (turn it off in Windows Features) for the reason that it was constantly using the hard drive in an excessive way (maybe because I've got very large quantities of files on my PC), noticeably slowing down my computer, and the Windows.edb database file grew way too large, about 2.5 GB in size. But the side-effect of it is that now the search bar is gone from any Explorer window and I miss this useful feature. So my question is, is there a way to stop Windows Search Service torturing my hard drive and still being able to search for files and folders directly from Explorer, perhaps using some third-party software?

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• MySQL maintenance - how to clear the buffer?

  - by Dougal

  We have a server running our web app (PHP / MySQL) which is SLOW. My predecessor says that: "We use to do database maintenance, which use to clear the buffer, cached and unwanted variables." And I wonder what on earth he means with that statement? Does he mean a simple optimize of the tables? Or the query cache? I understand MySQL but don't really know what he is describing. I would appreciate any pointers. Thanks.

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• What's throttling the database?

  - by Troels Arvin

  Hardware: Intel x86_64 with 192GB of RAM. OS: CentOS 5.4 x86_64. DBMS: DB2 v. 9.7.1 64 bit. During certain special workloads (e.g. parallel REORGs/RUNSTATs), I've seen the server transporting 450MB/s with 25000IO/s (yes, there is probably some storage system caching happening here) while all CPU cores were happily working in an even mix of usermode/wait. And disk benchmark tools can also bring some very satisfying bandwith and IO/s numbers to the table. On the other hand, we also have another scenario: A single rather complex query with at least one large table scan. db2's "list applications" reports that the query is Executing (not locked). IO: At most 10MB/s, 500 IO/s; CPU: two cores in 99.9% wait state, all other cores 100% idle. The tables which the query reads from have been altered to have LOCKSIZE=TABLE, so I would think that lock list work is zero. What's going on in such a situation? What tools/snapshots/... can I use to gain better insight in such a case?

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• how to rewrite or redirect old or missing or invalid url to 404 page

  - by kath

  I recently upgraded a site and almost all URLs have changed. I have redirected all of them (or so I hope) but it may be possible that some of them have slipped by me. Is there a way to somehow catch all invalid URLs and send the user to a certain page I am using PHP Thanks so much! error file is already in .htaccess but seems nothing going to change you can see the error file as below AddHandler application/x-httpd-php5s .php ErrorDocument 404 /content/404.php <IfModule mod_rewrite.c> RewriteEngine on RewriteBase / here are 2 different url one the first one is old one which i edited and the secound one is edited one #1 old one (which is no longer on the server) http://adsbuz.com/vehicles-cars/toyoya/2009-toyota-land-cruiser-gxr-4686.htm #2 the editet one which is on the server http://adsbuz.com/vehicles-cars-for-sale/toyoya/2009-toyota-land-cruiser-gxr-4686.htm i need only the secound one with the vehicles-cars-for-sale because the other directory is already modified and its not on the server but as you can see after the (adsbuz) site name vehicles-cars and vehicles-cars-for-sale both are opening for same location I hope I made myself clear

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• Chipset GPU causes a massive slowdown

  - by zyboxenterprises

  My AMD Radeon HD 7700 recently broke (fan stopped working and GPU overheated), and now I'm running on internal chipset graphics, and it causes a massive slowdown of the whole PC. I've changed the graphics memory from 32MB (minimum) to 256MB (highest), and it hasn't made any difference whatsoever. I'm using Windows Aero, and disabling it should have made a small difference, but it didn't; the whole PC is still slow. I know that it's not the computer build, because I built it myself, and it was a lot faster when it had the AMD Radeon HD 7700 in it, which is the reason why I believe it's the internal chipset graphics that are causing the problem. Is this behavior normal? I don't have the cash right now to go out and buy a new dedicated GPU. I'm using an ASRock N68C-GS FX motherboard with an AMD FX 4100 (overclocked to 4.3GHZ), with 4GB RAM. The overclock was an attempt to resolve this issue, and it isn't related to this issue that the integrated graphics is causing a slowdown.

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• Reporting memory usage per process/program

  - by Nick Retallack

  How can I get the current memory usage (preferably in bytes so they can be added up accurately) for all running processes individually? Can I roll up the summaries for child processes into the process that spawned them? (e.g all apache threads together). Sometimes, my server runs out of memory and becomes unresponsive. I want to discover what is using up all the memory. Unfortunately, it's likely to not be a single process. Some programs spawn hundreds of processes, each using very little memory, but it adds up. On a side note, is it normal for apache to spawn 200+ processes?

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• linux: accessing thousands of files in hash of directories

  - by 130490868091234

  I would like to know what is the most efficient way of concurrently accessing thousands of files of a similar size in a modern Linux cluster of computers. I am carrying an indexing operation in each of these files, so the 4 index files, about 5-10x smaller than the data file, are produced next to the file to index. Right now I am using a hierarchy of directories from ./00/00/00 to ./99/99/99 and I place 1 file at the end of each directory, like ./00/00/00/file000000.ext to ./00/00/00/file999999.ext. It seems to work better than having thousands of files in the same directory but I would like to know if there is a better way of laying out the files to improve access.

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