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• KVM vs Hyper-V. Which hypervisor is best for windows guests?

  - by user198851

  I am currently testing openstack for windows guests (XP and 7). I have deployed openstack "all in one" on system with following specs Processor corei5. (4 physical cores and 8 Threads with HT Technology) RAM 8 GB. HD 500 GB. I have created 4 windows xp guests with 512MB RAM and 1VCPU. On each windows guest i have installed visual studio 2008 only. In nova.conf CPU Over-Commit ratio is 2 for better performance (as mentioned in openstack operation guide). Using KVM as hyerpvisor. I have observed poor performance when simultaneously using visual studio in four windows instances. How i can improve performance ? Should i use KVM or Hyper-V ? or any other suggestion ?

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• Is there anyway that I can set the 'real' memory usage value while running my java code?

  - by vira

  I'm running a code on a server to generate a 10,000x10,000 matrix and save each value into a table (MySQL). I was informed by the administrator that I can use up to 32g of the physical memory of our server but have no idea how to do it. I googling around and so far only found information about setting the virtual memory using -Xmx. I tried it anyway and using top command I got this: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3981 gv 35 15 32.4g 304m 10m S 1 0.5 9:54.84 java So, it shows that the -Xmx set the VIRT and not the RES value. Is there anyway that I can set the RES value into 32g?

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• Why does Ubuntu 10.04 not see my hard drives?

  - by CT

  I am trying to install Ubuntu Desktop 10.04 64bit to a new machine. mobo = gigabyte x58a-ud3r cpu = i7 930 ssd = Kingston 64GB V+ hhd = wd 1tb black When the installation gets to the prepare partions step, no partitions are listed. Drives are recognized by BIOS and WinXP setup sees them. I have also tried Ubuntu 9.10. It does not see the drives also. Just searching around I found a suggestion to select "no dmraid" in additional options screen. This did not seem to help. Any ideas?

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• How many nginx/fastcgi processes do you use?

  - by qliq

  I have a drupal-based website on a VPS with 1GB RAM and 1Ghz processor share. The webserver is nginx along with php-fastcgi. Currently I am using 10 nginx and 13 php-fastcgi processes. The server load is high most of the times while half of the RAM is unused. The CPU usage rarely reaches 80%. I have tried some other combinations of nginx/php-fastcgi but am not sure what is the optimal combination because I am quite ignorant about what's going on below the surface. So I appreciate if you could share your experience or give me some clues.

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• How does the performance of pure Nginx compare to cpNginx?

  - by jb510

  There is now a Cpanel plugin to fairly easily setup Nginx as a reverse proxy on a Cpanel/Apache server. I've been simultaneously interested in setting up my first unmanaged VPS and my first Nginx server and as a masochist figured why not combine the two. I'm wondering however if it's worth setting up a pure Nginx server vs trying out cpNginx on Apache? My goal is solely to host WordPress sites and while what I've read raves about Nginx's is exceptional ability serving static at least as a reverse proxy, I am unclear if there is substantial benefit to running a pure nginx with eAccelorator over cpNginx on Apache for dynamic sites? Regardless I'll be running W3TC on all sites to cache content, but am still interested if there are big CPU reductions running PHP scripts under pure Nginx over cpNginx?

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• Timing startup processes?

  - by acidzombie24

  My Windows 7 use to boot up fast and now its getting rather slow. I suspect one program is eating up all the time yet i cant tell what it is since task manager shows <40% of the cpu being used. What can i use to track how long each process takes when my computer boots/starts up? Note: Except for launchy which i used before my comp became slow, all my startup and services are all signed and known (broadcom, VMWare, Google Inc, Intel, etc) Note2: I am mostly considering the time it takes after i login but i suspect the time before that is slightly slower (i dont think very much though)

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• Performance Drop Lingers after Load [closed]

  - by Charles

  Possible Duplicate: How do you do Load Testing and Capacity Planning for Databases I'm noticing a drop in performance after subsequent load tests. Although our cpu and ram numbers look fine, performance seems to degrade over time as sustained load is applied to the system. If we allow more time between the load tests, the performance gets back to about 1,000 ms, but if you apply load every 3 minutes or so, it starts to degrade to a point where it takes 12,000 ms. None of the application servers are showing lingering apache processes and the number of database connections cools down to about 3 (from a sustained 20). Is there anything else I should be looking out for here?

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• How do I know if my disks are being hit with too much IO reads or writes or both?

  - by Mark F

  Hi All, So I know a bit about disk I/O and bottlenecks relating to this especially when relating to databases. But how do I really know what the max IO numbers will be for my disks? What metric might be available to me for working out roughly (but needs to be a good approximation) of how much capacity (if you will) have I got left available in I/O. I've seen it before where things are bubbling along nicely and then all of a sudden, everything screams to a halt, and it ends up being an IO bound problem. Is there a better way to predict when IO is reaching its limits? This article was interesting but not giving the answer I desire. "http://serverfault.com/questions/61510/linux-how-can-i-see-whats-waiting-for-disk-io". So is my best bet surrounding just looking at 'CPU IO WAIT'? There must be a more reactive method for this? Best, M

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• Apache stops serving requests when connections increase

  - by Gunjan

  The values for MaxClients, ServerLimit etc parameters are quite high (4000). Available RAM on the server is high too (~8G). Load average remains below 1 on a 24 core CPU. But when the number of visitors on the website increase apache just stops serving requests. The apache error log is blank and access log shows no more requests coming in. Restarting apache makes it work again until the number of requests increases again. Any ideas where to start looking? UPDATE Getting the below errors in apache error log on running it with LogLevel Debug [info] server seems busy, (you may need to increase StartServers, or Min/MaxSpareServers), spawning 32 children, there are 479 idle, and 1027 total children

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• Fedora 16 Running Hot

  - by sdasdadas

  Since switching from Windows 7 to Fedora 16, my laptop has been running incredibly hot (by the air exhaust). The laptop is an Asus K73S. Running 'sensors', I receive: acpitz-virtual-0: 75.0 celsius nouveau-pci-0100: 66.0 celsius asus-isa-0000: 75.0 celsius The only CPU hog is Firefox at 30 - 40% on average. My GPU information (from lspci) is: Intel Corporation Xeon E3-1200/2nd Generation Core Process or Family Integrated Graphics Controller (rev 09). Running lspci | grep -i VGA, returns: 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: nVidia Corporation GF106 [GeForce GT 555M SDDR3] (rev a1) I don't notice a huge difference running without the battery, but it does seem a little cooler. Thanks!

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• games and movies become too slow after some time

  - by ishaq

  On my gaming desktop, I was fixing my desktop's power supply when something seemed to burn (I got that stinging burning smell). However when I turned ON the computer (it was OFF before), everything seemed to be fine. However, I have noticed that now it becomes too slow if I play a game or movie on it. I am talking about the computer becoming painfully slow after about 5 minutes into the movie/game (it works fine otherwise e.g. browsing), it becomes so slow I can see individual frames from movies/games. What could be the problem? A fried video card? friend memory (RAM), something else? My system's configuration is: Intel Core i7 CPU 3.40GHz 8GB DDR3 RAM 2TB WDC HDD NVIDIA GeForece GT 220 (1GB) Thermal Take Commander MS1 Chassis ( http://www.thermaltakeusa.com/Product.aspx?S=1394&ID=2051 ) mainboard: Intel DH67CL AAG10212-208 Realtek High Definition Audio

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• Windows XP crashes by GT610 driver (nv4_disp)

  - by undone

  I have a PC which was working fine but one day screen went dark and nothing was shown. I thought the problem is graphic card, so I replaced it with new one. I bought a new graphic card (GeForce 610) and installed it on my system. I formatted my hard-drive and installed a fresh Windows XpSp3 and its drivers. Everything was fine but after installing graphic card's driver, I got an error saying windows got stuck in an infinite loop and it couldn't get out (in nv4_disp). I uninstalled it and downloaded its last version and installed it. Unfortunately, I got the same error and windows restated! Here's my system: Pascal Motherboard PT880PRO Intel CPU Windows XPSp3 I searched this issue on the internet and I found bunch of suggestions (from cleaning hardware to installing latest version of its driver) but nothing help! Any help would be appreciated! Thanks.

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• How can I create a bootable CD-ROM/USB Drive? (With NTFS + USB Drive support)

  - by RonK

  My motherboard got fried and I was forced to get a new hardware set (MB+CPU+RAM) so in most likelyhood I'll need to reinstall my Windows 7. I usually follow procedure and put the OS on the primary partition and my data on a logical partition - so I can format the primary without concern - but this time I made a mistakte and left some crucial items on the primary partition. I want to create a bootable CD-ROM/USB Drive which can read NTFS so I can access this data. If booting via a CD-ROM, I would prefer being able to connect a disk-on-key/My Passport to the computer and be able to access it to transfer the data to it. How can I do it? (free 3rd party applications are most welcome)

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• Opening notebooks

  - by Plastkort

  I have a Compaq CQ40 which has a defective CPU fan, it seems unable to cool the notebook enough at this time, it is constantly running, and if you move the pc up/down to look under it, it makes some sort of chainsaw sound. I have tried to take out all the screws underneath, but I still have a problem with the plastic cover on the above; I am afraid I might break it since it seem to be connected with plastic clips underneath. I have fixed notebooks before, but this one seem new, how can I open the plastic cover above without breaking it? Any advice, tips and tricks would be so nice to have, not only for this notebook, but any future notebook also I might need to repair. It would be nice if anyone here knows a place with video tutorials on this subject as well.

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• What does this error mean (Can't create TCP/IP socket (24))?

  - by user105196

  I have web server with OS RHEL 6.2 and Mysql 5.5.23 on another server and the web server can read from Mysql server without problem, but some time I got this error: [Sun Sep 23 06:13:07 2012] [error] [client XXXXX] DBI connect('XXXX:192.168.1.2:3306','XXX',...) failed: Can't create TCP/IP socket (24) at /var/www/html/file.pm line 199. my question : What does this error mean (Can't create TCP/IP socket (24))? is it OS error or Mysql error ? perl -v This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi mysql -V mysql Ver 14.14 Distrib 5.5.23, for Linux (x86_64) using readline 5.1 su - mysql -s /bin/bash -c 'ulimit -a' core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 127220 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 10240 cpu time (seconds, -t) unlimited max user processes (-u) 1024 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited

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• How do I reduce RAM usage on my server?

  - by Abs

  I have recently launched a site that is very popular but I am having trouble with scalability. My site makes heavy use of FFmpeg and at peak times RAM usage hits the 2 GB point quickly and the swap file starts getting used. CPU usage starts rising too. Users complain that the site is slow. They say this because all FFmpeg instances run very slow because of the number running at the same time. Users make use of FFmpeg on my server in real time. Is there anything I can consider or do to ease down the usage of the server and RAM just shooting up? Maybe there is something better than FFmpeg (!). Is the only solution "throwing some cash" at a more powerful server? I have given little information, please ask for more, so this problem can be solved.

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• segmentation fault when using pointer to pointer

  - by user3697730

  I had been trying to use a pointer to pointer in a function,but is seems that I am not doing the memory allocation correctly... My code is: #include<stdio.h> #include<math.h> #include<ctype.h> #include<stdlib.h> #include<string.h> struct list{ int data; struct list *next; }; void abc (struct list **l,struct list **l2) { *l2=NULL; l2=(struct list**)malloc( sizeof(struct list*)); (*l)->data=12; printf("%d",(*l)->data); (*l2)->next=*l2; } int main() { struct list *l,*l2; abc(&l,&l2); system("pause"); return(0); } This code compiles,but I cannot run thw program..I get a segmentation fault..What should I do?Any help would be appreciated!

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• Why does reusing arrays increase performance so significantly in c#?

  - by Willem

  In my code, I perform a large number of tasks, each requiring a large array of memory to temporarily store data. I have about 500 tasks. At the beginning of each task, I allocate memory for an array : double[] tempDoubleArray = new double[M]; M is a large number depending on the precise task, typically around 2000000. Now, I do some complex calculations to fill the array, and in the end I use the array to determine the result of this task. After that, the tempDoubleArray goes out of scope. Profiling reveals that the calls to construct the arrays are time consuming. So, I decide to try and reuse the array, by making it static and reusing it. It requires some additional juggling to figure out the minimum size of the array, requiring an extra pass through all tasks, but it works. Now, the program is much faster (from 80 sec to 22 sec for execution of all tasks). double[] tempDoubleArray = staticDoubleArray; However, I'm a bit in the dark of why precisely this works so well. Id say that in the original code, when the tempDoubleArray goes out of scope, it can be collected, so allocating a new array should not be that hard right? I ask this because understanding why it works might help me figuring out other ways to achieve the same effect, and because I would like to know in what cases allocation gives performance issues.

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• Is putting swapfile & temp folder in ramdisk a good idea in Windows 7 64 bit with lots of ram?

  - by Tony_Henrich

  I want my Windows to run as fast as possible. If I have 12GB ram in Windows 7 64bit, quad core cpu, and all apps fit in memory, will the swap file ever be used for anything? The question is about if its a good idea to put the swap file in a ram disk. Would a ram disk help in any way or will Windows intelligently use all the available memory for all its work? I am also thinking of putting the temp folder in a ram disk. I know ram disk is volatile memory and I don't care about its content in it if it gets lost.

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• Server Overload Due To Log File

  - by emresavas

  cPanel sent me the following email: IMPORTANT: Do not ignore this email. This is cPanel stats runner on ***.***.com! While processing the log files for user ***, the cpu has been maxed out for more than a 6 hour period. The current load/uptime line on the server at the time of this email is 04:41:14 up 15 days, 22:36, 0 users, load average: 7.66, 7.84, 8.00 You should check the server to see why the load is so high and take steps to lower the load. If you want stats to continue to run even with a high load; Edit /var/cpanel/cpanel.config and change extracpus to a number larger then 0 (run /usr/local/cpanel/startup afterwards to pickup the changes). How can I lower the load?

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• DIagnosing another Windows 7 Lockup

  - by MSEoris

  Im running windows 7 on a fairly modern machine (8gb ram, amd fx-6100, gtx 560ti) and I notice that periodically my windows seems to just hang for a little while. Frequently this occurs after a cold boot and i start up five or six small to medium sized programs, but also occasionally it occurs during normal usage. Basically what occurs is the screen locks up, there is no keyboard responsiveness for a period of 30 seconds to a full minute - after a bit of patience, control is returned, but I'm interested in figuring out what is causing such lockups. I checked the event log and dont see any issues, and all i can see in task manager is a spike in cpu and memory usage right after this occurs. Any tips on how to even begin to diagnose this? Thanks.

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• Windows-Vista events: Diagnostics-Performance: How-To read this information?

  - by Ice

  Hi, i am wondering how long the bootprocess needs and looking in %SystemRoot%\system32\eventvwr.msc /s. Some entries marked as critical like : Starting needs : 184707ms, sometimes 211855ms or 269767ms Some Errors like: This process does many diskactivities and lower the performance of Windows: Filename : ntoskrnl.exe Why are the startups marked as critical? Are the values normal on a Dell Precision M90 (Intel Centrono Dual CPU, 2GB RAM, 80 GB Disk)? Some entries marked as Errors showing the time for shutdown, but there are some like this one i printed in this question, what is the meaning of this?

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• Error installing SQL Server 2005 Express on AMD Turion?

  - by Angel

  Hello. Is there some compatibility problem between SQL Server 2005 Express and AMD processors? I read something along those lines on various sites, but found nothing 100% definitive. I am trying to install SQL Server 2005 Express on a computer that runs Windows Vista Home Premium, 32-bit edition, and the CPU is "AMD Turion Dual-Core RM-70". I tried both the 32-bit and 64-bit installers, just in case, and the process runs fine until the moment the service attempts to start, where it fails with the same error every time. I'm sorry I can't provide more details or the exact message, it was on a client computer to which I have no access at the moment. I hope someone could shed some light on this. Thank you.

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• Dual 9500GT video cards, one works

  - by bossDub

  I have two video cards, both are PCIe 512MB Nvidia 9500GTs. One is an Evga and the other is another brand. If I put them both in, the one in the top slot will work (either card). The one in the lower slot says Code 12, not enough resources to use this device. I've tried disabling Firewire and a few other things in an attempt to get more "resources". Intel DP45SG motherboard. 4G Ram. 64bit Vista. Q8200 CPU. I do not have the SLI connector.

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• Is my laptop good enough to support my development needs? [closed]

  - by KodeSeeker

  I have an ASUS Pentium-R Dual Core CPU running at 2.20Ghz. It has 4 gb of built in ram, currently running a 64 bit Windows 7 . I just started graduate school and Im wondering whether I should go in for a new laptop or just repair the nagging battery on my current one. My requirements include - -Ability to support IDE's - I may end up running Eclipse, Visual Studio's and the like to help with my work. - Ability to run multiple VM's (not concurrently). Im currently running a Ubuntu 12 and 9 as VM's (not sure if this is overloading the system) - I'm a non gamer so I really dont care about a minor glitch caused by running a uber heavy game. -In addition I will have heavy use of Office Application Software and will be using my computer to watch movies and stream media. Looking forward to your replies and suggestions!

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