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  • High CPU usage - symptoms moving from server to server after bouncing

    - by grt3kl
    First off, I apologize if I didn't include enough information to properly troubleshoot this issue. This sort of thing isn't my specialty, so it is a learning process. If there's something I need to provide, please let me know and I'll be happy to do what I can. The images associated with my question are at the bottom of this post. We are dealing with a clustered environment of four WebLogic 9.2 Java application servers. The cluster utilizes a round-robin load algorithm. Other details include: Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04) BEA JRockit(R) (build R27.4.0-90_CR352234-91983-1.5.0_12-20071115-1605-linux-x86_64, compiled mode) Basically, I started looking at the servers' performance because our customers are seeing lots of lag at various times of the day. Our servers should easily handle the loads they are given, so it's not clear what's going on. Using HP Performance Manager, I generated some graphs that indicate that the CPU usage is completely out of whack. It seems that, at any given point, one or more of the servers has a CPU utilization of over 50%. I know this isn't particularly high, but I would say it is a red flag based on the CPU utilization of the other servers in the WebLogic cluster. Interesting things to note: The high CPU utilization was occurring only on server02 for several weeks. The server crashed (extremely rare; we are not sure if it's related to this) and upon starting it back up, the CPU utilization was normal on all 4 servers. We restarted all 4 managed servers and the application server (on server01) yesterday, on 2/28. As you can see, server03 and server04 picked up the behavior that was seen on server02 before. The CPU utilization is a Java process owned by the application user (appown). The number of transactions is consistent across all servers. It doesn't seem like any one server is actually handling more than another. If anyone has any ideas or can at least point me in the right direction, that would be great. Again, please let me know if there is any additional information I should post. Thanks!

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  • Is it possible/advisable to run VMware Server ESX/ESXi on a laptop?

    - by cletus
    The idea of having a small footprint hypervisor as the primary OS on a laptop or desktop where every "real" OS is a guest appeals to me. Now I realize this software is more typically used on blades and the other servers but can it be done on a normal PC? Should it be? What requirements are there (eg hardware/BIOS/chipset)? Is there a performance impact for doing so? Is it a good/bad idea?

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  • Connecting to Server 2008 shares fails

    - by Chris J
    I'm having problems getting a reliable share working on an x64 Server 2008 R1 SP1 server. All works well after a reboot, but after some time (within a day) the shares become unavailable to XP and Server 2003 servers. Interestingly, they remain available to other Server 2008 servers. On trying to access \\server\share, Server 2003 returns immediately and simply gives me the message "The specified network name is no longer available", XP takes a minute or two to timeout before giving the same message. There doesn't seem to be anything in the event logs indicating a problem. Doing some googling over the last day or two I've seen the following blamed: Bad network drivers ... I've updated to the latest drivers with no result Symantec anti-virus ... we're not using it (currently no AV on the server) Receive window auto-tuning ... I've disabled with netsh int tcp set global autotuninglevel=disabled and netsh int tcp set global rss=disabled None of these have had an effect. Windows Firewall is currently disabled. As other Server 2008 boxes (both x32 and x64) can connect, I can only assume that there's some new security configuration that's not quite right - or there's an AD issue that I need to trace, but don't know where to start. Even if anyone doesn't know how to resolve, if someone knows what I need to look for with Wireshark this would be a help.

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  • SSD as primary or secondary drive on a small Linux server?

    - by Alex Martelli
    I'm pensioning off my 10-years-old home server and replacing it with an Ubuntu 10.04 box. The two storage devices are a Western Digital Caviar Green 2.0TB HD and an Intel X25-M 34nm Gen 2 80GB SATA II 2.5inch SSD (the box has 8GB RAM and an i5 750, if it matters). I don't care much about boot times (since I don't plan to reboot all that often;-); the main frequent, performance-demanding task will be (re)building large open source C or C++ software packages from sources (as an open source contributor, I do that often). So, I thought I'd keep the SSD as the secondary drive and the HD as the primary one, using the SSD mostly for the files that can otherwise demand a lot of seeking (esp. in a parallel make). However, the friendly vendor (perhaps more experienced in Windows systems than in Linux ones) thinks the "normal" way to configure the machine would be with the SSD as the primary drive. I'm pretty rusty on configuring and tuning systems, so, I thought I'd better double check on SuperUser... thanks in advance for advice about this choice!

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  • Unable to set initcwnd on a Hetzner server

    - by Sergi
    We just ordered a bunch of Hetzner EX40SSD servers with the minimal Debian install image that they provide and everything is just fine except that looking at tcpdumps for fine tuning the network from various locations the initcwnd param seems to be stuck at 6 no matter how we change it. By default Debian 3.2 kernels should have that setting to 10 so it's pretty strange. Is it possible that the NIC driver or a custom setting in the Hetzner Debian image is limiting this param? Even if we set it to 4, like the old kernel default, it doesn't work. Any ideas would be much appreciated! Does anyone know if the NIC drivers provided by default by Debian have some kind on limitation. In a long thread in http://www.webhostingtalk.com/showthread.php?t=1200617&highlight=hetzner they talk about a page http://wiki.hetzner.de/index.php/Installation_des_r8168-Treibers/en where Hetzner states that the included Realtek r8168 driver is not working properly, but nowhere do they say that the initcwnd could be affected. Tomorrow i will try to install a CentOs image and see if Debian is the problem...Last resort would be to install a custom debian image, but that is a pain in the ass! Thanks!

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  • Apache configuration FollowSymlinks- Apply to php scripts?

    - by Josh
    I have Options set to none for my webroot directory. I also have a symmlink /var/coderoot - /var/webroot/coderoot In the php script I can do include("/var/coderoot/file"); and it works fine. Regardless of the option (yes I save and restart apache.) Does follow symlinks only apply to symlinks used in a certain way? Is there a performance loss using the include with a symmlink?

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  • How to tune system settings for mongoDB on Linux?

    - by jsh
    Trying to squeeze a lot out of one question here -- please bear with me. Although the MongoDB man pages make several useful recommendations about system settings like ulimit (http://docs.mongodb.org/manual/reference/ulimit/), and other production factors (http://docs.mongodb.org/manual/administration/production-notes/) they seem mysteriously silent on things like virtual memory and swap settings. The closest we get to a hint is that "...the operating system’s virtual memory subsystem manages MongoDB’s memory..." (http://docs.mongodb.org/manual/faq/fundamentals/#does-mongodb-require-a-lot-of-ram). Running the same job - high writes and high reads on about 10,000,000 records in a single collection -- on my 4-processor, 4GB RAM macbook and an 8-core ubuntu box with 64GB RAM I saw dramatically WORSE read performance on the linux box with factory settings, and could hear the disk constantly spinning, indicating high I/O and presumably swapping. Yes, other things were happening on the box, but there was plenty of free RAM, disk space, etc.; furthermore, I did not see evidence that Mongo was expanding to take advantage of all that free RAM as it is touted to do. Linux box default settings were as follows: vm.swappiness =60 vm.dirty_background_ratio = 10 vm.dirty_ratio = 20 vm.dirty_expire_centisecs =3000 vm.dirty_writeback_centisecs=500 I hazarded some guesses looking at docs and blogs for other types of databases (Oracle, MYSQL, etc.), experimented, and adjusted as below. vm.swappiness=10 vm.dirty_background_ratio=5 vm.dirty_ratio=5 vm.dirty_writeback_centisecs=250 vm.dirty_expire_centisecs=500 I saw some immediate apparent improvements in read time. However, when I ran my test jobs again, read performance continued to be painfully sluggish during heavy writes. Then, I REBUILT the collection from an available data source - and suddenly I can read at 1ms or less per record WHILE doing the write job! So the question is really two-fold: 1) What are appropriate VM settings for MongoDB on Linux? 2) (bonus) Does Mongo do some checking or optimization with the OS while data is being built? In other words, if I have built a large data set with suboptimal VM or I/O settings, does Mongo make assumptions during the memory-mapping process that will fail to take advantage of optimizations down the road? Obviously I don't fully grok memory mapping under the hood (I was hoping I wouldn't have to). Any help appreciated...thanks! -j

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  • My way of Comparing CPUs

    - by abbasi
    There are many types of CPUs, like Pentiume, Atom, core 2 duo, core iX (X = 3,5, ....), But I always don't look at them this way! I always look at their speed which in GHZ unit and then compare them with each other. For example when some CPU is in type of 'X' with 2 GHZ of speed and another one is in type of 'Y' with 2.2 GHZ of speed, I say the second one ('Y') has better speed and also better performance. Is it a correct way? Thanks

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  • BitTorrent Myth

    - by Moon .
    In BitTorent Statistics there is a field "Total Ratio" that is the ratio between total downloads and uploads. i have heard that this ratio affects BitTorrent'ss performance. If the ratio is better then BitTorrent Network provides you services on priority. And If the ratio is down (less uploads) then the BitTorrent provides you services on average or below average priorities. Is there something like that.....

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  • How to get the MongoDB' current working set size

    - by Howard
    From the doc , it said "For best performance, the majority of your active set should fit in RAM." So for example, my db.stats() give me { "db" : "mydb", "collections" : 16, "objects" : 21452, "avgObjSize" : 768.0516501957859, "dataSize" : 16476244, "storageSize" : 25385984, "numExtents" : 43, "indexes" : 70, "indexSize" : 15450112, "fileSize" : 469762048, "ok" : 1 } Which value is the working set size?

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  • Bypass network stack. Which options do we have? Pros and cons of each option [on hold]

    - by javapowered
    I'm writing trading application. I want to bypass network stack in Linux but I don't know how this can be done. I'm looking for complete list of options with pros and cons of each of them. The only option I know - is to buy solarflare network card which supports OpenOnLoad. What other options should I consider and what is pros and cons of each of them? Well the question is pretty simple - what is the best way to bypass network stack? upd: OpenOnload It achieves performance improvements in part by performing network processing at user-level, bypassing the OS kernel entirely on the data path. Intel DDIO to allow Intel® Ethernet Controllers and adapters to talk directly with the processor cache of the Intel® Xeon® processor E5. What's key difference between these techologies? Do they do roughly the same things? I much better like Intel DDIO because it's much easy to use, but OpenOnload required a lot of installation and tuning. If good OpenOnload application is much faster than good Intel DDIO application?

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  • Stop windows 7 disk thrashing when idle

    - by Konrads
    Hello, I installed Windows 7 on VMWare and it works just fine! However, when I leave the machine idling and work on my host OS, Windows 7 decides that it is a good idea to thrash disk and kill performance. How do I disable these background processes? Is it just indexer?

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  • Get statistics on how ReadyBoost is being used by Windows

    - by TomA
    I have experimentally started using a flash drive for ReadyBoost. There's no blinking light on it so I don't even know if it's being accessed at all. Is there some way to get statistics on how often or how well Windows actually uses the drive to improve performance? Something like numbers of cache hits/misses or something...

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  • Redis connection issue

    - by mre
    We are currently experiencing a lot of Redis errors with the message Unable to connect: read error on connection, trying next server We run Redis on FreeBSD using PHP Redis and we have a hard time reproducing the error on Ubuntu so this might be a hint. There's a long-running issue on that topic on github. Basically we get a socket from the operating system with a call to connect(host, port, timeout) in phpredis, but when we do a select(db_index) afterwards, we get an exception. Could there be an issue with persistance? I assume that connect does nothing in the background and select tries to access the connection, which is actually closed. We don't run into a timeout. We tried tuning TIME_WAIT without success. Any other ideas on where the problem might come from? What is the best way to track the issue down? dtrace maybe? Update We are currently looking into our BGSAVE settings. Interestingly it takes half a second and more to create a fork for the process which regularly writes the data to disk (persistence) and maybe redis can't respond to connect() requests during that timespan.

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  • Western Digital External 1TB HDD, possible to mount internally?

    - by JL
    I have an external WD MyBook. it has USB, Firewire and e-sata connectors, but I would like to mount it internally in my desktop system instead for extra performance, and I'm also considered about how long it will last externally. Does anyone know if this is possible? Has anyone done this with success? I would have to remove it from the existing external chasis, but before I mess around with this, I would like to know if its even possible. Thanks in advance

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  • Ubuntu 64-bit vs 32-bit

    - by tukushan
    Is it worth installing the Ubuntu 9.10 64-bit version over the 32-bit x86 version? I will get the ability to address more than 4 GB of memory, but other than that, how does the 64-bit version fare in terms of performance and stability?

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  • Is 768Mb RAM @ 333Mhz faster or slower than 512Mb RAM @ 400Mhz?

    - by Peter
    I have a simple question, but am not a hardware specialist. I have a small low-budget server with 512 Mb SD RAM, 400 Mhz. I have an extra 256 lying around, but it's 333 Mhz. I know I can add it to the system, and that it would automatically adjust the 400Mhz to 333Mhz. But my question is, which is faster/better for performance: 512 at 400Mhz, or 768 at 333Mhz?

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  • Top - what does Virtual memory size mean? ...linux/ubuntu

    - by user42159
    I am running Top to monitor my server performance and 2 of my java processes show virtual memory of upto 800MB-1GB. Is that a bad thing? What does virtual memory mean? And oh btw, I have swap of 1GB and it shoes 0% used. So I am confused. Java process = 1 Tomcat server + my own java deamon Server = Ubuntu 9.10 (karmic)

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