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• NFSv3 Asynchronous Write Depends on Block Size?

  - by Joe Swanson

  I am trying to figure out if my NFSv3 deployment is performing SAFE asynchronous writes. I suspect that it is doing strictly synchronous writes, as I am getting poor performance in general. I used Wireshark to look at the 'stable' flag in write calls, and look for 'commit' calls. I noticed that, with especially large block sizes, writes to appear to be performed asynchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=2097152 count=512 However, smaller block sizes appear to be performed strictly synchronously: dd if=/dev/zero of=/proj/re3/0/zero bs=8192 count=655360 What gives? How does the client decide whether to tell the server to perform writes synchronously or asynchronously? Is there any way I can get smaller block sizes to be performed asynchronously?

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• Video acceleration problem with Windows 7 games and PPTX files

  - by Jordan 1GT

  I have a Dell xps M1330 which originally ran Vista, but I upgraded to Windows 7. When I try to run a Win 7 game like spider solitaire I receive the following message: The game is running in software rendering mode. Hardware acceleration is either disabled or not supported by your video card driver which could slow down game performance. Make sure you have the latest video card driver installed and that hardware acceleration is turned on. I confirmed that hardware acceleration is turned on. When I go to Dell's site, I'm told there is no later video driver. When I run the game it runs very choppy. I have a .pptx file which is doing strange things in normal view and I suspect it may be related to the same video acceleration problem.

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• How do I know if my SSD Drive supports TRIM?

  - by Omar Shahine

  Windows 7 has support for the TRIM command which should help ensure that the performance of an SSD drive remains good through it's life. How can you tell if a given SSD drive supports TRIM? See here for a description of TRIM. Also the following from a Microsoft presentation: Microsoft implementation of “Trim” feature is supported in Windows 7 NTFS will send down delete notification to the device supporting “trim” File system operations: Format, Delete, Truncate, Compression OS internal processes: e.g., Snapshot, Volume Manager Three optimization opportunities for the device Enhancing device wear leveling by eliminating merge operation for all deleted data blocks Making early garbage collection possible for fast write Keeping device’s unused storage area as much as possible; more room for device wear leveling.

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• Diagnosing high CPU waiting

  - by Will

  I have a monitoring server that is running icinga/collectd/graphite with about 50 hosts. I have noticed high load/slugging performance on the box. If you take a look at top, you'll see: Cpu(s): 0.6%us, 0.2%sy, 0.0%ni, 7.6%id, 23.4%wa, 0.0%hi, 0.2%si, 0.0%st Notice the HUGE %wa value, which as far as I know means a network or disk bottleneck. ifconfig shows no dropping packets and there's not a ton of bandwidth going on, so that leaves disk issues, right? There's not a lot of disk writing going on either...iotop is reporting we're only writing a little over 1 MB per second and the RAID tool reports everything is A-OK and write caching is enabled. How do I go about trying to figure out how to fix this? UPDATE: iostat -x output is: avg-cpu: %user %nice %system %iowait %steal %idle 0.62 0.10 0.31 9.65 0.00 89.31 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.21 33.34 83.55 16.54 1599.94 399.07 19.97 43.21 416.98 3.71 37.13

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• Is there any way to stop or pause Windows fake-raid re-synching?

  - by haimg

  I have two physical disks, each one holds two volumes, they are Windows fake-RAID1. E.g.: Disk A: Partition1 Partition2 Disk B: Partition1-Mirror Partition2-Mirror After an unclean reboot, Windows started resynching these as expected. What was not expected, however, is that it started resynching both volumes at the same time. Both disks seek back and forth like crazy, and synching performance is horrible. Question: Is these any option to stop or pause synching of just one volume? I know I can put one of the disks offline, but that will stop synchronization of all volumes on that disk. Note: I have certain reasons why I need to torture myself with Windows RAID. I'm not interested in alternative RAID solutions right now.

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• Unable to create context rendering error whet run OpenGL application

  - by Rodnower

  Hello, I try to run Mesa gears example and I get following error: freeglut (./gears): Unable to create direct context rendering for window 'Gears' This may hurt performance. though the application runs successfully, but I guess that in future I will have much problems with productivity. I run Linux CentOS 5 on WMvare 7. Mesa's version is 6.5 Relevant output of lspci -v gives: 00:0f.0 VGA compatible controller: VMware SVGA II Adapter (prog-if 00 [VGA controller]) Subsystem: VMware SVGA II Adapter Flags: bus master, medium devsel, latency 64, IRQ 9 I/O ports at 10d0 [size=16] Memory at d0000000 (32-bit, non-prefetchable) [size=128M] Memory at d8000000 (32-bit, non-prefetchable) [size=8M] [virtual] Expansion ROM at 30000000 [disabled] [size=32K] Capabilities: [40] Vendor Specific Information Any one have idea? There is driver of vmvare for CentOS? Thank you for ahead.

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• What's the downsides of Running Ubuntu 9.10 32bit on AMD64 Processor

  - by Omar Dolaimy

  Hi, I was thinking about installing Ubuntu 9.10 32bit on a DELL Inspiron 1501 with 64bit processor Laptop. Since It's was real pain to me to run Java Browser plugin, Flash Plugin, J2ME Toolkit, and many other tools. But It was 90% OK with me. This was Ubuntu 8.10 (a year ago), And now the Ubuntu 9.10 came and I'm thinking about installing the 32 bit on it and get rid of the pain. Is there a downside for that?? considering that the display card is not supported now so exclude this from your calculation, I will never play REAL games on it and I'm not a big fan of Compiz effects. I'm not here to ask about the performance (which is about 15%+ for the 64bit only), I just want compatibility!

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• windows server 2008 vs ubuntu 11 [closed]

  - by user472875

  I am working on implementing a custom server application that should be capable of handling a very large volume of traffic. I am aware that this type of question has been asked a lot, but I haven't been able to find a good answer. What I'm really looking for is for a server with given specs which OS will be able to handle a larger traffic faster and more reliably. I do not care about rights management or any other features. I am fairly good with both platforms, and so I would like to pick the OS with better performance on a clean install, and with nothing else running. Thanks in advance.

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• Drive configuration for 5 large databases

  - by Mr. Flibble

  I've got 5 databases, each 300GB, currently on a RAID 5 array consisting of 5 drives. All the databases are used heavily, at the same time, so drive speed is an issue. Would I see better performance if I got rid of the RAID 5 configuration and just put each database on a separate drive? The redundancy provided by RAID 5 is not necessary due to mirroring elsewhere. Will the server then be able to perform reads / writes to different databases drives in parallel? More so at least than when it's in RAID? This is all on Windows 2003 / SQL 2008.

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• How to benchmark apache/nginx setup

  - by Saif Bechan

  I am planning to setup nginx as reverse proxy. I will have apache to deliver my dynamic content, and nginx will deliver the static content. My configuration i have now is just Apache with fastCGI. This gives me no configuration problems and runs great. After I have set up nginx I want to run some benchmarks to see if I really got some performance increases, else i will switch back. Does anyone know how I can benchmark this type of setup? Or maybe someone did this already and have some canned results, I will be glad to hear them.

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• .NET Framework 4.0 installation is very slow

  - by Dimitri C.

  On my Windows Vista, it takes a full 12 minutes to install the .NET Framework 4.0. a) Is this normal? b) If not, can something be done about it? The reason I'm concerned about the speed is because it slows down the testing of our product installer considerably. Testing an installer is time consuming already, but this new .NET Framework installer makes it almost undoable. Detail: I did the test on a clean Vista inside a VirtualBox virtual machine. This setup does not show any performance issues in other situations. I tried both dotNetFx40_Full_x86_x64.exe and dotNetFx40_Client_x86_x64.exe. They both take approximately the same time to install.

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• How to Shrink large Hyper-V VM

  - by autrevo

  Using Disk2VHD utility I converted my bare-metal OS into Hyper-V VHD - http://technet.microsoft.com/en-us/sysinternals/ee656415.aspx And I could obtain a huge 190GB VHD file. Apart from performance issues, this VHD worked fine as guest when hosted on Windows Server 200 R2, Hyper-V. Having realized need to keeping only system files and application installations on VHD. I have deleted most of the junk data from this VHD and now it contains only 20-25 GB. But I am not able to shrink the VHD VM. Having done some research, I came to know, this as a limitation of .VHD files. Subsequently I followed these two step using Edit Virtual Hard Wizard on Windows 2012 Box. Convert from VHD to VHDX (took close to 3 hrs.) Compact (Another 4 hrs.) This did not ever shrink the VHDX either. Does Hyper-V does not provide proper support to handle large VHDs or VHDXs whose size are the range of 200GB.

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• Do parent website application pools serve child application pools as well?

  - by Mike G

  I am running a .NET web application in its own application pool on IIS7. The parent website is set to run in its own application pool. Today we noticed a huge number of connections going to IIS. I tried to browse a plain ol' .html page in the directory of the web application and it hangs. I then try to browse another plain .html file in the root of the parent website, and it too hangs. In performance monitor, i see there are some 8k connections to the default website and climbing. I cant seem to understand if my application was the problem, or IIS itself. If it was my application, wouldnt the html page in the root of the parent website still be able to be served? edit: Also, if i shut down the app pool to my application, the html page on the root of the parent website is still not able to be displayed.

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• Apache - Difference between ScriptAlias and WSGIScriptAlias

  - by Jiri Kadlec

  I'm using apache on RHEL Linux server In my /etc/httpd/conf.d/httpd.conf there are two directives: WSGIScriptAlias /apps /var/www/apps <Directory /var/www/apps > Options MultiViews ExecCGI MultiviewsMatch Handlers SetHandler wsgi-script Order allow, deny allow from all </Directory> ScriptAlias /scripts /var/www/scripts <Directory /var/www/scripts > Options MultiViews ExecCGI MultiviewsMatch Handlers SetHandler wsgi-script Order allow, deny allow from all </Directory> What is the difference? I understand that WSGIScriptAlias is restricted for running Python scripts and ScriptAlias also allows running perl scripts. Can I always use ScriptAlias instead of WSGIScriptAlias? Are there any performance advantages of using WSGIScriptAlias instead of ScriptAlias?

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• Mac Book Pro SSD

  - by LiamB

  I have a Mac Book Pro (I7 and 8 Gig Ram). I'm a developer - do a fair amount of .net via VMware but lots of Ruby and NodeJs on the Mac. I'm looking to extract some more performance and i think a SSD might be a good option. So I have 2 questions, Can I straight up replace the drive thats in there with a SSD or will this cause me problems? I have files on there as well as apps. What are my options in terms of available hardware.

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• Using a Raspberry Pi as a VPN?

  - by sudo rm -rf

  So I'm sure many of you have heard of the new Raspberry Pi project. I was looking at messing around with Model B, which has the following relevant specs: Broadcom BCM2835 700MHz ARM1176JZFS processor with FPU and Videocore 4 GPU 256MB RAM Boots from SD card, running the Fedora version of Linux (ARM Version) 10/100 BaseT Ethernet socket USB 2.0 socket So I was curious if it would be possible to create a simple VPN out of this little machine. I do realize that since it's an ARM processor that might mess up quite a few things. Any ideas if this is possible? Just for what it's worth, this would be a personal project so I'm not worried about performance.

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• Trying to determine the correct number of XFS allocation groups for postgresql server on Linux

  - by HBlend

  I am running a postgres 8.4.5 server on the linux 2.6.33.7 kernel on an 8 disk raid array with an LSI controller. Most of the tables are around 1GB or less. I know that XFS uses allocation groups (AG) to achieve I/O parallelism. My first question is, does this mean that if two tables are in the same AG, all I/O requests are queued to both of them if either is being read from/written to? If so, I assume I would want to spread my tables across as my allocation groups as possible, correct? Wouldn't this ensure that multiple users querying different tables would get the best performance?

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• Concurrent backups in SQL Server?

  - by Mikey Cee

  We currently have our backups managed by a third party company. There are a bunch of agent jobs created that take full backups (4 times a day) and transaction log backups (4 times an hour). We now want to manage our backups in house, but don't want to disable the third party's jobs until we are sure that we have everything configured correctly internally So I am proposing to have a short period (say, a couple of days) where backups are being taken both by the old and the new system. I am wondering what the ramifications of having these two different systems both manage backups, and the potential pitfalls of having backups taken simultaneously. Is this even supported? If so, and bearing in mind that the system can cope with one backup without any noticeable performance degradation, is it fairly logical to assume that it should be able to cope with two simultaneous backups? Currently the load on the server is fairly light and it rarely struggles. Any advice is appreciated

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• Moving VMWare Fusion image to Boot Camp

  - by Kristopher Johnson

  I have Windows 7 64-bit running in VMWare Fusion on my MacBook, but am disappointed with the performance, and so I want to try Boot Camp. However, I'd like to avoid reinstalling Windows and all my applications; I just want to somehow copy my VMWare Fusion "disk image" to a Boot Camp partition. My initial thoughts are that I should be able to run a Windows backup program in VMWare Fusion to back up the entire virtual disk, then set up Boot Camp and restore from that backup. However, Googling finds a few posts by people who have tried that and have encountered problems. So, is there a "known good" procedure for doing this?

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• Server 2008 Hard Faults

  - by claw

  Hey all, plase bear with me as I haven't looked at a server in a very long time. The problem I am having is with a Windows 2008 Standard FE Service Pack 2 Intel Xeon X3430 @ 2.40 2.39 GHZ 4 GB Memory 64 Bit There seems to be no problems other than the physical memory peaking at 91%, always with over 100 Hard Faults Per Second. To my understanding hard faults should be fairly rare on a machine with. Are there any logs I can show you? Or investigate myself. The general performance of the machine is ok, i can access SBS2008 and change settings fairly smoothly without hangs etc. However, we connect to the server and do quite a bit of SQL via an application. For a record to retrieve say 20 rows, it can take 20+ seconds. Thanks in advance, Jamie EDIT: What the server is used for: IIS ASP Web Service SQL 2008 List item Exchange unable to upload screenshots due to low reputation - why doesnt my SO work here :)

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• Unable to Get IIS Response Times with Hyperic Monitoring Tool

  - by jwmajors81

  We have a very large .NET application (vendor) that I am trying to gather performance metrics for using Hyperic. In general I wanted to be able to report response times for each of the components within the application, which include: Web Services ASP.NET Pages MSMQ I am currently unable to successfully monitor the response times for IIS on my windows machines. I have successfully auto-discovered them and I am getting diagnostic information, but am not getting back the response times. After looking online at what other people are seeing, I found that I am missing a tab for the response times which is usually next to the metrics tab. Also, when I look at the configuration screen for IIS I do not see a field which enables me to specify where the log files are located at. Please note that my logs are located at e:\LogFiles\ instead of the usual location because our IT staff doesn't allocate much space for the C: drive. Please note that I have the MSMQ monitors up and running great. Any assistance would be greatly appreciated. Thanks, Jeremy

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• What does the "Maximum Frequency" number mean in the Windows Resource Monitor?

  - by nhinkle

  In the Windows Resource Monitor's CPU tab, there is a status box and graph for the "Maximum Frequency", right next to the "CPU Usage" values. What does this mean? The value is sometimes over 100% on my system... what could that imply? By looking at CPU-z's real-time report of the processor's clock speed, it seems to be loosely related to what frequency the CPU is running at, which would imply that it means "percent of maximum possible frequency the CPU is running at"; this would be of relevance on systems with SpeedStep and/or TurboBoost technology (or similar). Furthermore, setting the system to "power saving mode" lowers the "maximum frequency" value to around 60%, while setting it to "high performance" mode sets it to around 110%. However, the percentage does not seem to exactly correlate to the CPU speed being shown. What value is this actually representing then?

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• Turning off Chrome's visual effects

  - by Wesley

  Is there any way to turn off the visual effects used by Google Chrome? For example, the tabs slide around smoothly, the scrolling is really smooth, and there is a huge arrow that fades in and out during download. Reason why I'd like to know is primarily because I want to maximize battery life on my netbook by using less visual effects and, secondly, because I use Chrome on slower systems and would like to maximize the performance and efficiency of Chrome. This applies mainly to Windows XP, but also Vista, 7 and even (X)Ubuntu 9.10. EDIT1: Oh yes... disabling the attaching/detaching of tabs and turning them into translucent in the process. That's a bit stressful on my slower machines.

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• External hard drive encryption

  - by Kragen

  I've got a complete backup of my main PC on 1.5 TB external hard drive that I carry around with my laptop so I can have access to all of my files while I'm on the move, however it has just dawned on me that if someone nicks my external hard drive they now have access to everything! Hence I'm looking for a way to encrypt my external hard drive. I'm after something that is: Secure (if I need to carry around a USB dongle to keep the key on so be it) Fast (the performance of the drive should still be reasonable) Cross-platform (I regularly use other peoples computers - Sometimes they are not windows based and might not even have internet access, however I still want to be able to access my files) Cheap (preferably free / open source!)

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• video streaming infrastructure advice

  - by Alchemical

  We would like to set-up a live video-chat web site and are looking for basic recomendations for software and hardware set-up. Most streams will be broadcast live from a single person with a web cam, etc., and viewed by typically 1-10 people, although there could be up to 100+ viewers on the high side. Audio and video do not have to be super-high quality, but do need to be "good enough". The main point is to convey the basic info in the video (and audio). If occasionally the frame-rate drops low and then goes back to normal fairly soon, we could live with that. Budget is an issue, so we are in general looking for a lower cost solution that will give us most of what we need in temers of performance and quality. We are looking at Peer1 for co-lo. The rest of our web site will be .Net / Windows platform. We are open to looking at any platform for the best streaming solution, although our technical expertise is currently more on the Windows side.

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