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• Apache worker is crashing after 3.000 users

  - by user1618606

  I activated Apache Worker on my VPS and I'm having problems, 'cause the website is crashing when 3000 users are accessing the website. I'm using http://whos.amung.us/stats/2jzwlvbhvpft/ as counter. My Apache Worker configuration: KeepAlive On MaxKeepAliveRequests 0 KeepAliveTimeout 1 <IfModule mpm_worker_module> ServerLimit 20000 StartServer 8000 MinSpareThreads 10400 MaxSpareThreads 14200 ThreadLimit 5 ThreadsPerChild 5 MaxClients 20000 MaxRequestsPerChild 0 </IfModule> The VPS have the SO: Debian 64 LAMP, memory: 14gb and CPU: 24ghz What I could to do to give a best performance?

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• Is it wise to use SSHDs (Solid state hybrid drives) on a server?

  - by Seb

  I have a bunch of servers with very heavy I/O that currently use SATA3/SAS drives, but do suffer from I/O wait on the SATA drives, and I have just been alerted to the existence of SSHDs which cost the same for 1TB as the 1TB SATA drives that we currently use. However, previously (until Seagate shipped their first 3.5" SSHD in March) they seemed to be exclusively for Netbooks/Notebooks, which leads me to suspect they're not exactly built for the heavy I/O they'd be in for with my servers. So, would an SSHD give me a performance boost over my SATA3 drives in a heavy I/O environment (such as multiple very large high speed file transfers) or is it best to stick with SATA3 with I/O wait??

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• How do I find the source of soft page faults?

  - by David Robison

  I have Windows 7 x64 computer that according to Performance Monitor has 70,000 page faults / second when idling. That's seems like a lot to me (every other computer I check has basically 0 page faults / second when idling). If I use Resource Monitor or Process Explorer to check hard faults, I see that they are basically 0. So all the page faults are soft. Normally, soft page faults are not a problem, but I suspect they might be causing issues for this computer given there are so many. I would like to identify what programs are causing the soft faults. Are there any tools that exist the display the number of soft page faults for each process?

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• critical swap nagios

  - by Toby Joiner

  I installed nagios a very long time ago, and have started trying to use it now. I am getting this error: Current Status: CRITICAL (for 231d 16h 52m 49s) Status Information: SWAP CRITICAL - 100% free (0 MB out of 0 MB) Performance Data: swap=0MB;0;0;0;0 Current Attempt: 4/4 (HARD state) Last Check Time: 01-09-2011 13:26:34 Check Type: ACTIVE Check Latency / Duration: 0.125 / 0.004 seconds Next Scheduled Check: 01-09-2011 13:31:34 Last State Change: 05-22-2010 21:36:47 Last Notification: 01-09-2011 13:01:42 (notification 5521) Is This Service Flapping? NO (0.00% state change) In Scheduled Downtime? NO Last Update: 01-09-2011 13:29:32 ( 0d 0h 0m 4s ago) Is this normal? Should I be concerned? If more info is needed please let me know.

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• Apache CPU usage stays at 100% even when there are no requests

  - by Leirith

  Hi, I've been running the Apache HTTP server benchmarking tool (ab) on my new Apache server to test performance. I noticed that with a command like the following: ab -n 100000 -c 1000 http://www.mysite.com/ The CPU is used 100% by the apache2 processes during the testing. When the test concludes, usually with the following error just before the last requests are made: apr_poll: The timeout specified has expired (70007) Total of 99960 requests completed the CPU usage remains at 100%, and it's all being consumed by apache. I am using the worker MPM with and running PHP with mod_fcgid. Any advice as to why this is or what can be done to stop it would be appreciated.

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• What are my X client options for MS Windows?

  - by Nick Bolton

  I need to connect to a headless X Windows server (running on Ubuntu) from my MS Windows 7 computer over a 100 Mbit network. I could use VNC (or any other remote viewer) but the 3D graphics performance would be lousy I imagine. I used to have it hooked up to a monitor, but that's broken now and I can't afford a new one. A friend advised that I could try and use an X client, and that the 3D graphics wont suffer too much over 100 Mbit. Cygwin seems to be an option, but I was wondering if there were any more lightweight options.

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• Installing VirtIO drivers in Windows Server 2008

  - by Stefan K.

  We are running a Windows Server 2008 system as a "guest" on a Linux-KVM virtual server (SLES11, with VirtIO support). We have trouble with the system performance and this is possibly due to not using the VirtIO drivers. I don't have much experience with neither KVM not VirtIO. Just heard it this could be the reason for our problem. Questions: The install examples I just found are describing how to install the drivers during Windows setup. Is it possible to install the VirtIO drivers later? We have running software on that system and would like to avoid reinstalling/setup of all these. I already found a page describing how to sign the drivers, which seems to be needed. A good tutorial page (step by step instructions) would be nice. Is there anything like that out there?

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• Bigger ProjectServer farm is performing worse

  - by MSPS DBA

  I am using Project Server 2007 sp3 with SharePoint 2007 sp3 and SQL Server 2008 r2. I have recently moved my farm from 2 servers (1 DB and 1 App/Web) to a very big farm having Many Servers, Clustered Database, Load Balancer, Powerful processors and Large RAM. This Farm has more than one Web Servers, Project App Servers, SharePoint App Servers and a separate Index Server. But the performance of Project Server in the new Farm has been downgraded. Views are taking even more time to load data and Project publishing time has also been increased. I am also facing deadlock problems which are causing the project server queue jobs to fail. Could anyone inform me that what would be the reason of this problem and what should be the starting point to look into the issue? Is it mainly because now the application server needs to communicate with other application servers which were not needed in the previous farm? Thanks!

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• Why are there so few Wireless N Dual Band adapter PCI cards, only USB adapters instead?

  - by daiphoenix

  There has been several Wireless N Dual Band routers/APs out in the market for quite some time now, and there are several Wireless N Dual Band USB adapters out there. But as for PCI/PCI-X card adapters, there seems to be only one (the Linksys WMP600N). Why is that? I find it very strange. Is it because the USB adapters are easier to install, and can be used on multiple computers? But if so, why isn't it the same case with single band (2.4 Ghz) wireless N adapters? Because for these ones there as many PCI card adapters as there are USB adapters. Also, can the USB adapters, despite the lack of external antenna, offer the same level of performance as a card with external antennas?

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• Video problem with Windows 7 Games

  - 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 wouldn't care, but I loaded a .pptx file which is doing strange things in normal view and I suspect may be related to the same video problem. Any ideas?

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• recommendations for a lightweight linux distribution for a test server

  - by Jack

  I'm planning on setting up a test server to experiment with some application servers (tomcat/jboss/...) and with some portals. Now the machine I've set aside for this is lightweight CPU/GPU wise(Atom D510, 4 gigabyte ram, 500 GiB hdd, onboard GPU). But it should suffice for most things, I'm more interested in the stability of JBoss/Tomcat for my purposes than the stability. However I'm having a bit of trouble picking an appropriate distribution size/performance/setup time wise/security wise since it seems I can't sneeze without another distribution popping up. I've been thinking about going for Fedora since I've read that that distribution has been optimized for Atom, but I'm not really familiar with it. My experience with Linux has mostly been limited to Ubuntu and some tinkering with puppylinux. I'm not afraid to get my hands dirty using the command line. I'm not planning on starting a discussion per se, mostly the pros/cons that people have encountered with some distributions

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• Windows script to create directories of 3,000 files

  - by uhpl1

  We have some email archiving that is dumping all the emails into a directory. Because of some performance reasons with the server, I want to setup an automated task that will run a script once a day and if there is more than 3,000 (or whatever number) of files in the main directory, create a new directory with the date and move all the main directory files into it. I'm sure someone has already written something similar, so if anyone could point me at it that would be great. Batch file or Powershell would both be fine.

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• C drive should only contain OS. Myth or fact?

  - by Fasih Khatib

  So, I have a 500GB HDD @7200RPM. It is split as: C: 97GB D: 179GB E: 188GB My belief is to keep OS ONLY in C:\ and any adamant programs that won't go anywhere apart from C:\ [because this speeds up the PC during startup process] and install programs in D:\ so that in case I have to reinstall the OS, I will have the programs readily available after reinstall. But I have begun to think this approach is flawed because if C:\ is formatted, I will lose registry values and stuff that goes in %appdata% and so it is no use keeping programs in D:/ drive because they will be useless after all. Should I go ahead and install ALL of my programs in C:\ and then use D:\ and E:\ for storing my data like photos, text files, java files n all? How will this impact the performance of the HDD? I only have 3 programs in D:\Program Files so it will be easy to reinstall them :)

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• CPU clock scales down so computer is unusable after switching to battery

  - by Ryan

  When I am plugged in my laptop runs great however when I unplug it and I'm on battery power my CPU clock speed scales down pretty much all the way. I know this is happening by monitoring the clock speed. When plugged in it will usually stay between 1000MHz and 3000MHz but when I unplug it it quickly scales down to less than 500MHz and will get as low as 100MHz and it will NEVER scale up at all on battery power. After I plug the power back in it will then begin operating normally in about a minute. I have tried setting the MIN and MAX CPU performance in power options to 100% and have tried messing around with cooling settings which seemed to be a problem with HP laptops. I have a Toshiba Satellite M500-ST6444 running Windows 7. The BIOS is up to date. I have tried two versions.

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• misaligned raid partition in Ubuntu 10.04

  - by Linux Jedi

  I attached two identical hard drives to my linux machine. Then using gparted I formated the first 1024 mb at the beginning of each drive as linux swap space. Then I went into system-administration-disk utility. In there I went to file-create-RAID array. I selected the remaining space in each of the two identical hard drives and created a striped raid array. After the array was created, a warning message appeared. It said "The partition is misaligned by 522240 bytes. This may result in very poor performance. Repartitioning is suggested." What do I do now? As far as I can tell, the partitions are identical.

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• Few questions on giga tweaker

  - by user23950

  I better consult first the people here before I do anything unnecessary using this app called giga tweaker. I don't really understand what this increase the performance of your CPU thing. It is under Customization-Memory Management-ram & disk cache of giga tweaker. What will happen if I change the level cache size of l2 cache into the highest possible value which is 8Mb. What are the negative effects of doing it? The file system caching memory, still under Customization-Memory Management-ram & disk cache. What effects will it have on my system which has 2Gb of Ram and 2.50 Ghz of Dual Core CPU. Please enlighten me.

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• How can I display images on a MS Access 2007+ form with a hyperlink source?

  - by Yaaqov

  I am looking improve the efficiency of an Access 2010 database by using a web server with images and only storing the hyperlink source (i.e, http://www.images.com/images/image1.jpg) in the table. I know that one can save images as "attachements", using a "blob" object type, but when you're dealing with thousands of images, queries are bogged down, and performance suffers. So in short, is there are relatively simple way of displaying images on MS Access forms with a source that is a hyperlink address (storing files locally and using filepaths is not preferable). Thanks.

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• OPTIONS * HTTP/1.0 APACHE

  - by Abby E

  I been noticing a lot lately in my /server-status the OPTIONS * HTTP/1.0 has been coming up lately a lot. I'm running Ubuntu 12.04 with the latest apache/php/MySQL. I'm not sure what they're for but I would like to see if it would effect performance by some how turning it off. I host some stuff that is accessed a lot that uses PHP/MySQL (600 rps). I'm not sure what it's there for but I do see the local 127.0.0.1 IP, so I assume it's something running local. What is it? How do your turn it off? If turned off how would it effect performance? The list below is a small example of it. (127.0.0.1 REMOVED.(null) hostname has been removed) 211-0 - 0/0/1035 . 24.28 240189 0 0.0 0.00 0.18 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 212-0 - 0/0/51274 . 677.97 202960 0 0.0 0.00 8.99 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 213-0 - 0/0/419 . 11.85 240424 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 214-0 - 0/0/240 . 7.96 240552 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 215-0 - 0/0/309 . 9.29 240492 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 216-0 - 0/0/98510 . 1258.25 177391 0 0.0 0.00 17.29 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 217-0 - 0/0/338 . 10.18 240464 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 218-0 - 0/0/345 . 10.27 240469 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 219-0 - 0/0/118538 . 1507.99 168914 0 0.0 0.00 20.80 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 220-0 - 0/0/98452 . 1259.10 177412 0 0.0 0.00 17.29 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 221-0 - 0/0/384 . 10.84 240453 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 222-0 - 0/0/331 . 10.03 240477 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 223-0 - 0/0/314 . 9.04 240493 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 224-0 - 0/0/75193 . 975.24 188845 0 0.0 0.00 13.18 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 225-0 - 0/0/362 . 10.62 240457 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 226-0 - 0/0/125773 . 1593.26 165647 0 0.0 0.00 22.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 227-0 - 0/0/82541 . 1063.89 185092 0 0.0 0.00 14.48 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 228-0 - 0/0/409 . 11.50 240436 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 229-0 - 0/0/219 . 7.38 240581 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 230-0 - 0/0/357 . 10.48 240458 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 231-0 - 0/0/469 . 12.39 240411 0 0.0 0.00 0.08 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 232-0 - 0/0/394 . 11.32 240445 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 233-0 - 0/0/276 . 9.00 240510 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 234-0 - 0/0/245 . 8.51 240536 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 235-0 - 0/0/215 . 7.45 240555 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 236-0 - 0/0/370 . 11.00 240443 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 237-0 - 0/0/400 . 10.96 240446 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 238-0 - 0/0/266 . 8.51 240531 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 239-0 - 0/0/304 . 9.81 240499 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 240-0 - 0/0/446 . 12.47 240421 0 0.0 0.00 0.08 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 241-0 - 0/0/19741 . 282.90 230130 0 0.0 0.00 3.45 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 242-0 - 0/0/98503 . 1259.43 177404 0 0.0 0.00 17.28 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 243-0 - 0/0/251 . 7.93 240551 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 244-0 - 0/0/273 . 8.42 240534 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 245-0 - 0/0/118485 . 1508.14 168950 0 0.0 0.00 20.79 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 246-0 - 0/0/294 . 9.35 240509 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 247-0 - 0/0/413 . 12.34 240437 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 248-0 - 0/0/258 . 8.55 240529 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 249-0 - 0/0/303 . 9.77 240485 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0

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• Does Intel Smart Response provide any statistics on the cache usage?

  - by Tom Seddon

  I've set up my Z68-based Core i7 PC with a 60GB SSD dedicated as a Smart Response cache drive. Is there any way I can get any statistics out of it? It would be nice to have some information on how much cache space is actually being used, maybe how much of it was actually accessed recently, and how many reads in general are coming from the SSD rather than from the mechanical disk. These statistics might help to quickly provide some evidence for or against the use of Smart Response, without my having to reinstall Windows on the SSD (etc.) to find out. The Windows ReadyBoost feature has some performance counters you can access via the Windows 7 perfmon tool, for example, which is the kind of thing I'm hoping is somehow available. Smart Response provides no perfmon counters, though, and the Intel Rapid Storage Utility tells you pretty much nothing except that Smart Response is switched on.

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• How can I set deadline as the I/O scheduler for USB Flash devices by using udev rules?

  - by ????

  I have set CFQ as the default I/O scheduler. I often get bad performance when I write data into a Flash device. This is resolved if I use deadline as the I/O scheduler for USB Flash devices. I can't always change the scheduler manually, right? I think writing udev rules is a good idea. Can someone please write rules for me? I want: When I plug in a USB device, detect the type of the device. If it is a portable USB hard disk, do nothing (I think if a device has more than one partitions, it always a portable hard disk. If it is a USB Flash device, set deadline as it's scheduler.

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• I'll be setting up a dedicated web server at work soon, my first non hobby server - What should I know?

  - by Rogue Coder

  I've been running my own dedicated server running CentOS and a LAMP stack for 2-3 years now, but it's only been hosting my own websites which aren't super important. However, I will soon be setting up a Linux Webserver and Linux Database Server at work, and I'm wondering what are some important things I should be doing. It's an internal server only, so only people in the company can access it. Should I get a slave server for both of my servers for backups? If I do this, how many backups should I be keeping and how often should those backups be done? Right now on my current server I run a cron job nightly to backup my MySQL databases (Usually 40mb files once compressed), and bi-weekly cron jobs to backup my web root. I just store these files on my local computer via FTP. Also, for an internal server like this, should I look at using LightHTTPD or NginX to increase performance, or will Apache be fine?

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• Very slow Windows 7 on Thinkpad T61

  - by bogdanf

  I have a very strange problem with my fresh install of Windows 7 Profesional, 64bits on my Lenovo Thinkpad T61 : The overal performance is very slow, the disk is constantly spinning, even without any program running (after boot, no other programs installed). The boot process is very slow itself (4-5 minutes). I mention that the laptop was fine on XP until the upgrade. Thanks ! Additional info (as requested by the comments) : 2GB RAM Yes, I added all the manufacturer (Lenovo) drivers and updates (using the utility provided by Lenovo) Tried with both 32 and 64 bits editions. The 32 bits one is performing a little better, but not very usable either. The hdd has enough space (20 GB or so) The problem is still present on a fresh install, so no recycle bin emptying or unistall programs (there aren't any except plain 7) would help. I'm not a newbie, so no obvious causes are left unchecked

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• ESXi with non-headless VM

  - by Mike

  I'm going to receive a Xeon Server/Workstation soon and I was thinking about installing ESXi to host some server applications that I want (ex: SVN server, Web server, media server, etc). Most of these will be headless VM's. My question is: on top of all these headless VM's, is it possible for ESXi to have another VM that would be non-headless (so that it will output video through the VGA/DVI port)? Or are all VM's within ESXi only accessible through remote connections? I'll be using this non-headless VM like a regular workstation: browsing, development, media, gaming maybe. The other alternative I was thinking about is to install a very lightweight operating system and have the headless VM's running in Virtualbox. If it is possible to have have a non-headless VM, what would be the performance compared to a regular workstation? Noticeable or not when gaming?

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• Any limitations for putting an SSD in a Mini? How fast would an external HDD be via Firewire? Is Ser

  - by Cyrcle

  I'm considering getting a Mini for web programming. I do a lot of text searches so I want to put a SSD in it. Does the Mini have any limitations that might effect the performance of a SSD? I'm trying to decide if I should get a Mini Server. I'd like to be able to have two internal drives so one can be SSD for OS and the code I'm working on, and the other can be my storage drive. However, I'm not sure if I'll be using the extra functionality of the server edition OSX or not, so I'm reluctant to pay the $200 premium. In a "regular" Mini I could put the SSD internal and use an external big drive, but would the external drive be fast enough via Firewire? Thanks in advance for any info.

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• How do you explain ethernet cable problems to non networking people?

  - by Bryan McLemore

  We've recently been doing a large network migration in our datacenter. We've had a few cables in this start to deliver really bad pings (in excess of 500ms on a LAN) before they could be replaced. The cables we were replacing weren't made the best. They where all hand made and the runs were so short on some of them that the bend radius was definitely too tight. Some of them ran in bundles right in front of the heat exhaust of the power supplies. The cables were running ok until we started pulling the ones surrounding them out. Then a few started having the problem I mentioned above degrading performance and causing reliability issues. I'm trying to figure out the best way to explain this to non networking people. Is there any documentation that people could recommend or other methods?

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