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• Why does CentOS Linux use cpu/core #1 so much more in a 4-core system?

  - by ck_

  I've been watching top and htop for awhile on a very active server and I am wondering why linux does not automatically use cpu affinity better? CPU #1 (actually core #1 of 4) is used much more heavily than the others. Is there a setting similar to what vm.swappiness does for vm swap that forces a preferred affinity pattern? Should I be using forced affinity settings within mysql/apache/nginx/exim to get better results? This is on CentOS 2.6.32-279 x86_64 SMP Thanks for any suggestions.

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• Why do some software not get load balanced even when there are multiple cores?

  - by Nav

  While VTune Analyzer was running on a blade server with 8 cores, I observed the cpu useage percentage using mpstat -P ALL 1. mpstat showed me that VTune was taking up 100% of a single core, while all other cores were idle. Why does that happen? Shouldn't the OS (RHEL Server 5.2) automatically distribute load across cores? The same happened when I tried running MATLAB (even after enabling multithreading support in the MATLAB settings). p.s: I'm a developer. Not a sys admin. So felt it better to ask here rather than at serverfault.

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• Does using a hexacore CPU make sense?

  - by Exa

  I'm currently planning to upgrade my computer system and I want to exchange CPU, board and RAM. I already had a look at some hexacore-CPUs from AMD and would like to know if it makes any sense to use such a CPU with six cores. Is there any software which really uses six cores? Especially in gaming? I'm using this PC mostly for gaming and from time to time for developing. I know that on the dual-core system (2 x 3GHz) I currently use, Visual Studio creates two instances of the compiler, one for each core. Would there be six instances of the compiler on a hexacore system for super fast compiling? Is there any software that uses six cores? Would running two applications cause the usage of more CPUs? (For example two CPUs for a game you're playing while two other CPUs are used for compiling at the same time) I hope someone can point out the benefits of a hexacore system. The OS would be Windows 7 64 Bit and I use the PC for gaming most of the time. (Crysis 2, CoD, stuff like that)

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• Two-finger scrolling with Ubuntu 9.10 (Samsung NC10)

  - by 1passenger

  Is it possible to configure Ubuntu 9.10 to use two-finger scrolling on a Samsung NC10 netbook? I tried to configure it, but I had no success.

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• Install multiple Linux OS using WUBI

  - by soul

  I want to install Linux Mint, and Ubuntu on my laptop using Wubi installation. I already installed Ubuntu, but when I launch the Wubi installer for Mint. I got this guy: Does it mean to say that I can only install one os using the wubi? Do you know of any solution to this problem, except by installing mint using the usual way. I have XP and Windows 7 installed on the machine. That's why I'm using Wubi so that I won't get into troubles.

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• Bootable ISO to USB stick xp wuickest method

  - by brux

  My dog took a leak on my PC when I went out (ye funny), now it reandomly restarts - im convinced the HDD is failing because the Windows seagate diagnostic program fails on a few tests. I want to run this prior to windows in an attempt to try and recover sectors, the program includes an iso which can be written to cd and booted, but i dont have any cd's. I tried using unetbootin to create the bootable usb from the iso file (SeaToolsDOS222ALL.576.ISO) but it doesnt work. When i boot from the usb hdd unetbootin loads with "default" in the menu. No joy booting though. I checked the usb hdd in windows and all the files are there, extracted from the iso file, wont boot though. Any ideas? Im using windows xp, or

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• Can a Mac with Boot Camp support multiple Windows?

  - by the searcher

  Can a Mac with Boot Camp support multiple Windows? Such as Windows XP, Windows Vista, Windows 7, Windows 7 64 bit all on the same machine.

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• Why do I get a GRUB error after deleting the Linux partition?

  - by nateify

  I had a dual-boot setup with Windows 7 and Windows Vista. I used Easus Partition Manager and shrank my Windows 7 partition. In the empty space, I installed Linux Mint. I decided I didn't want it anymore, I simply deleted the Linux Mint partition. Now when I boot, all I get is this: GRUB loading. error: no such partition grub rescue> I don't have my Windows 7 install disk because it was pre-installed.

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• How are benchmarks for multiple cores calculated?

  - by B Seven

  I found this site to compare CPU's. http://www.cpubenchmark.net/high_end_cpus.html What wasn't clear is how the benchmark for multiple core processors is calculated. If one CPU has 4 cores (such as Intel Core i7 which comes in 2, 4, and 6 core versions: http://en.wikipedia.org/wiki/Intel_Core_i7#Core_i7), does that mean that the benchmark should be double that of the version that has 2 cores (assuming the same clock frequency)?

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• Is there a way to disable safe_mode in a client or domain template in Plesk?

  - by Justin

  Is there a way to disable the PHP setting safe_mode in a client or domain template in Plesk 8.6? Or, to disable it for new domain creation in some other Plesk setting/configuration? I've Googled, and people seem to think no I've asked our hosting provider, and they don't think so I've looked in both the domain and client templates in Plesk and don't see it Has anyone been able to do this Plesk 8.6 for new domains?

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• Should all my files be stored on my shared partition?

  - by James

  I am setting up a tripple boot HD and was going to use a 4th partition to share files between OS's. I was wondering if there is any point in having much space on each OS partition to store files or if I just make the shared partition big and put everything on that? Is there any difference in speed between accessing files on the shared partition vs the native files? Are there any other benefits/disadvantages of having files on either the native/shared partition? EDIT: OS's in question are Windows 7, Ubuntu 12.04, and OS X 10.7.4.

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• Installed Windows 7 Ultimate on D Drive and previous Windows 7 Enterprise on C Drive has stopped starting up

  - by teenup

  Please please help! I have installed Windows 7 Ultimate on same hard drive on D Drive on my laptop and the previous Windows 7 Enterprise which was installed on C Drive is not booting up now. When I turn on my laptop, I see two Windows 7 on the screen, when I select newer one, it starts, but when I select older one which is Enterprise edition, system won't start and I get the DOS black screen with this error message: Windows Boot Manager Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: Insert your Windows installation disc and restart your computer. Choose your language settings, and then click "Next." Click "repair your computer." Info: The boot selection failed because a required device is inaccessible. I notice that when I run the newer OS installed, the previous OS's drive (Which is D: now instead of C:) has become unusable and when I double click it, it asks me to format the drive. The data, that I had on my D Drive (Which is now C Drive for new OS), I had copied it to a network path and it is available. It was containing Windows 7 Users folder which I copied at that time when installing new windows. I have copied that Users folder again to the new OS's C Drive thinking it would run again, but of no use. Please please please...if someone can help...It is extremely required for me. Thanks a lot in advance.

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• Why doesn't max-height hold in Mobile safari in landscape mode?

  - by Mick79

  I am building a small portfolio site for myself and have come across an odd quirk. I have an image inside a container, and to allow for multiple screen sizes, I am setting all dimensions in % rather than pixels. in iphone portrait mode, everything is fine. However in landscape mode, my image bursts out of its container, completely ignoring the max-height:100%; rule that works fine in portrait. code: #centralident{ position:relative; width:50%; height:50%; box-shadow: 0 0 10px black; margin-left:25%; margin-top:13%; } #centralident img{ max-height:100%; }

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• how to substitude in multiple lines between {{{ and }}} with sed or awk

  - by chris

  First give out the text example: .... text ,.. {{{python string1 = 'abcde' string2 = '12345' print(string1[[1:3]]) print(string2[[:-1]]) }}} .... text ,.. the [[ and ]] happened outside of {{{ too. And maybe there is spaces and tabs before {{{ and }}}. I want to substitude all [[ and ]] into [ and ] between {{{ and }}}. NOTICE: I need to write the result back to original file. ( Maybe sed or awk is not the only way to do this ? )

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• Run 2 Windows XP modes?

  - by HeavyWave

  I have a Windows XP Virtual PC installed, which I have modified slightly. How do I install another copy to run in parallel?

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• NETSH : Set default ip address for an interface with multiple Ips

  - by elarichi.y

  To test a load balancer I need to switch my ip address several time a day, and keep other ips routing trough other Wans. I run these commands in a batch script: netsh interface ip set address "Connexion au réseau local" static %ipd% 255.255.255.0 192.168.1.1 1 netsh in ip add address "Connexion au réseau local" %ips1% 255.255.255.0 netsh in ip add address "Connexion au réseau local" %ips2% 255.255.255.0 ipd: is the default ip I want to set (all traffic should go trough it). ips1 and ips2 : are the secondary ips I want to keep but what ever I do all traffic goes trough one IP !! (first one in the range) Please help me with this issue.

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• Computer doesn't boot, continuously restarts; possible disk error

  - by Olcay Ertas

  I have shut down my computer two hours ago. When I open my computer it started restarting itself after showing the POST screen. I can open my computer with a Ubuntu Live CD or Windows installation CD. I can also open and boot my computer with my second drive, so I think something is wrong with my primary hard drive. Do you have any idea what the problem might be and how can I fix it? I am using an HP DV9087EA laptop and my primary disk is a WD500GB. I have installed Ubuntu 10.10 and Windows 7 on my drive.

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• SQL server availability issue: large query stops other connections from connecting

  - by Carlos

  I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the DBs, and the code seems to work fine. However, sometimes when one of my colleagues does a huge query against one of the other DBs, I see full CPU usage on the machine, and connections from my app time out. Why does this happen? I would have thought the many cores and harddisks would somehow (together with cleverly written DB server) be able to keep at least some of the resources free for other apps? I'm pretty sure he doesn't use multiple connections for his query. What can I do to prevent this?

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• Installing Cygwin, what distro do I use?

  - by user2699451

  I have a fresh install of Windows and a Linux OS that I can't access, how do I fix this? I do not have the .iso/disk for Linux anymore. So I figured, I can install Cygwin and through that install Grub, but I am used to Linux Mint, which uses apt-get. I have used CentOS before which uses rpm, but how do I install and use packages in the Cygwin terminal, and is it possible to install Grub through Cygwin?

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• How to boot more than 1 linux distro along with windows?

  - by BD at Rivenhill

  I have a machine that currently has Windows Vista living peacefully with Ubuntu 10.04 but I would like to test out another distro outside of a virtual machine without destroying my current Ubuntu or Windows installs. Is this possible? If so, any recommendations on how to arrange the partitions? I was thinking of moving user home areas to a separate partition and having 1 partition for all Ubuntu files and 1 for all files associated with the other distro.

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• Is there a RAR extractor (for multiple rar files like .r00 etc.) that will use all of my quad cores?

  - by Christopher Done

  I've got a quad core Intel processor. I've got a big file split into little ones as RAR files, foo.r00, foo.r01, etc. which the RAR program extracts into one file/directory. Is there a RAR program that I can specify like "use four cores" in the extract process? At the moment it sits there using 100% of one core. I recognise the bottleneck might be my hard drive anyway, but I don't see a lot of HD usage and suspect the decompression process is more intensive than waiting on I/O. For example, GNU Make accepts a (-j, I think) argument to tell it how many cores to use, which I used to compile PHP 6 really quickly.

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• Is it possible to use a dual processor computer as your desktop?

  - by Ivo Flipse

  I've seen some people suggesting to get a motherboard that supports two processors and stick two Xeon Nehalem processors in it. Could you use this system as a desktop PC or is this useless or even impossible? It's more hypothetical question if Windows 7 would support such a set-up. I know you could just take an i7, but wouldn't two of those processors be a whole lot more awesome? Like the previous generation Skulltrails? The idea would be to have a motherboard like this ASUS Z8NA-D6C Dual LGA 1366 Intel 5500 ATX and two Xeons (since I don't think i7's could be used) Intel Xeon E5405 Harpertown to run something like Windows 7 Ultimate.

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• User profile service fails

  - by s.r.a

  I have Windows 7 and 3 drives on my HDD. The second drive is D:\, and there are some files in that. I decided to install 8.1 Enterprise so I installed it in dual boot manner beside 7 and in D:\ drive which as I said was not empty and when installing 8.1, I didn't format the D:. I installed 8.1 successfully in D:\ and it was working fine. One time which I came up with 7, I thought I should arrange the 8.1 folders in D: to be separated from the other non-8.1 folders, so I created a new folder named it "Windows 8.1" and cut all 8.1 folders and pasted them into that new folder. Now my D: drive was arranged. When I restart the PC, I selected the 8.1 to start with, but it didn't come up like before and instead, it shows now a blue screen (not the blue screen of death!) and the time is shown in left-down corner of it. When I click the screen this message appears: The User Profile Service service Failed the sign-in. User Profile can not be loaded. I know two things: 1- The problem is to do with that cutting and pasting the 8.1 folders to be arranged. And 2- If I reinstall the 8.1, the problem will be solved (but if I don't do that cutting and pasting again!) Is there any simpler way to solve the issue and have the two OSs with each other?

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• Wake-On-Lan - is it possible to access boot menu?

  - by truthseeker

  Now imagine this situation. I have a computer which has 2 operating systems installed - Windows XP and Windows 7. On booting menu is displayed where I can select which operating system I want to load. When I do nothing, Windows 7 loads (after some delay). This computer is connected to LAN and has Wake-On-Lan function enabled. Is it possible to remotely select which operating system I wish to load? Now it is Windows 7. But sometimes I wish it would be Windows XP.

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• Questions about explorer.exe

  - by nmuntz

  Hi, I was given by my company a laptop with Windows XP Professional in Spanish. I would like to translate it to English, since I really DISLIKE to use localized versions of programs. I have read about Windows MUI packs, however you MUST have Windows XP Pro in English in order to translate it to other language, you can't translate it TO English from other language. Since reinstalling the OS using a Win XP CD in english is not an option (don't have the license nor the CD, and don't have domain privileges to rejoin my computer to the domain), I was wondering what are the essential files that contain localized strings of text. I was doing some research, and apparently explorer.exe has many of the Windows Error Messages and other strings. Will replacing my original explorer.exe with one from Windows XP in English be enough (and work) for having a "basic" english version of windows? Im mainly interested in having error messages, start menu, and the control panel in english. Also, does it HAVE to be the same version as the Service Pack im running? Besides explorer.exe are there any other essential files that i should try to get and replace? Do you see any "dangers" in replacing this files with english version ones? Thanks in advance for your help.

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