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• Changing memory allocator to Jemalloc Centos 6

  - by Brian Lovett

  After reading this blog post about the impact of memory allocators like jemalloc on highly threaded applications, I wanted to test things on a larger scale on some of our cluster of servers. We run sphinx, and apache using threads, and on 24 core machines. Installing jemalloc was simple enough. We are running Centos 6, so yum install jemalloc jemalloc-devel did the trick. My question is, how do we change everything on the system over to using jemalloc instead of the default malloc built into Centos. Research pointed me at this as a potential option: LD_PRELOAD=$LD_PRELOAD:/usr/lib64/libjemalloc.so.1 Would this be sufficient to get everything using jemalloc?

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• df -h showing wrong output in GB

  - by Anurag Uniyal

  If I list df output for KB, MB and GB, they do not match e.g. $ df -k |grep xvdb /dev/xvdb1 12796048 732812 11413172 7% /xxx $ df -m |grep xvdb /dev/xvdb1 12497 716 11146 7% /xxx $ df -h |grep xvdb /dev/xvdb1 13G 716M 11G 7% /xxx 12796048 KB = 12496.14 MB so that is slight off but OK 12796048 KB = 12.2 GB, 12407 MB is also 12.2 GB so why df is showing 13 GB or am I missing something? Here is full df listing $ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda1 7.5G 1.7G 5.5G 24% / none 5.8G 128K 5.8G 1% /dev none 5.8G 0 5.8G 0% /dev/shm none 5.8G 44K 5.8G 1% /var/run none 5.8G 0 5.8G 0% /var/lock none 5.8G 0 5.8G 0% /lib/init/rw /dev/xvdb1 13G 716M 11G 6% /xxx Coreutils version seems to 7.4 as info coreutils shows This manual documents version 7.4 of the GNU core utilities,

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• Should you disable page file with SSD?

  - by Pyrolistical

  I've been reading http://serverfault.com/questions/23621/any-benefit-or-detriment-from-removing-a-pagefile-on-an-8gb-ram-machine, and it has a lot of great information. But assuming you have more than enough ram, I think page file should be disabled on SSD to extend the life time. I know you would lose the core dump on crash, but not many people need that information. From my understand without a page file as you reach the limit of your ram that might trigger thrashing on disk. But for SSDs there is no concept of thrashing, reads are fast. What do you guys think?

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• Remove context menu items

  - by velvetkevorkian

  When I right click on a file and select open with, there are a bunch of irrelevant entries that I will never use. A lot of them are bits of the OS (e.g. Core Image Funhouse.app on image files) or at best dubious (I doubt I will ever want to open a .txt using Illustrator). Is there any way to remove items from the Open With menu? This is on OSX Lion 10.7.5. The only questions I could find related to this were about uninstalled programs remaining in the context menu. Thanks!

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• Is there a way I can use $PATH as defined by my bash profile?

  - by Adam Backstrom

  I spend most of my day ssh'd into servers. I have a series of aliases/functions/scripts that allow me to type p hostname from the terminal and execute GNU screen(1) on the remote side, using the following command: exec ssh hostname -t 'screen -RD'` I've only recently noticed that ssh -t does not get my custom $PATH. Here's some terminal output: adam@workstation:~:0$ sh server 'echo $PATH' /home/adam/bin:/usr/local/bin:/bin:/usr/bin:/opt/git/bin:/opt/git/libexec/git-core adam@workstation:~:0$ ssh server -t 'echo $PATH' /usr/local/bin:/bin:/usr/bin Connection to uranus.plymouth.edu closed. My biggest problem is my custom aliases only try to execute screen, since I can't guarantee an absolute path, and my $PATH is structured so the shell should find the correct one. If my $PATH settings aren't honored, my scripts don't work. Is there a way I can use $PATH as defined by my .bashrc/.bash_profile? I believe PermitUserEnvironment is disabled.

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• Separating user resources - Windows Server 2008 (Terminal Server)

  - by Christopher Wilson

  At the moment I am running a Windows Terminal Server 2008 for around 10 clients that use the server to run programs and access data. Is there anyway to separate the resources of each user so that they do not impact each other in terms of resources. User 1: Opens program User 2: Notices slow down I have looked into using Windows System Resource Manager but do not know if it provides what I need and if there are any other 3rd party tools that also provide this functionality. Any answer is appreciated. Server Specs: HP ProLiant ML110 G7 Processor: Intel® Xeon® E3-1220 (4 core, 3.1 GHz, 8MB, 80W, 1333/t) RAM: 12GB DDR3 ECC 1TB HDD

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• Slowdown after repeated hibernation in XP SP3

  - by John

  I have a Dell laptop w/dual core and 4 gigs of memory. Recently my machine has started to go off in never never land for 5 to 20 minutes at a time with a lot of hard drive churning. Eventually it comes back and everything operates properly. If I manage to have task manager up CPU usage shows no more then 3 to 5% during this process. I am on a corporate network and have very good virus protection in place. The problem seems to have increased in frequency since I let an update happen to IE8 and/or I started using hibernate more frequently. Any ideas or suggestions? TIA J

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• moving from Exchange 2003 to Exchange 2010

  - by pcampbell

  Consider a small-medium business' deployment of Exchange 2003. The question is around migrating to Exchange 2010. Here's a bit about the landscape: Current state is 50-100 users/mailboxes with the majority using Outlook 2007 OWA enabled desktop users are NOT running in Cached Exchange Mode laptops users ARE running in Cached Exchange Mode a single Exchange server with modest or reasonable specs for the day (3gz, multi-core, 4gb, Win 2003 32-bit) Questions Do you have any suggestions for the admin team regarding the upgrade path/steps from Exchange 2003 to 2010? Considering the requirement of a 64 bit OS, consider a new separate machine as ready to go with Win 2008. Have I missed any details? Where might virtualization help in this project? Any lessons learned in previous upgrades (2007 or 2010) would be appreciated!

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• PHP-FPM for nginx on debian

  - by Jelko

  What is the preferred/recommended way of installing php-fpm on debian for use with nginx? I read about a "php5-fpm" package everywhere, but it's not available in the official debian repos any more. The PHP-FPM website (http://php-fpm.org/download/) says that fpm is now included with the php core. Is it enough to install "php5-common" then? Where are the config files, though? Other people recommend to install the current version of php and php-fpm from dotdeb.org. The versions provided there are generally more up to date. But is it secure? Is this a good repo to use in a production environment? I would appreciate any advice.

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• How to record my voice on a Mac Mini with headphones?

  - by user718408

  I'm try to record my voice via the headphone on a Mac Mini, but it's not working. I saw on Apple's site that the Mac Mini can record voice, but it doesn't seem to be working for me. Here is a hardware overview: Model Name: Mac Mini Model Identifier: Macmini3,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.26 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 4 GB Audio: Make: Intel High Definition Audio Audio ID: 65 Headphone connection: Combination Output Line Input connection: Combination Input Speaker connection: Internal S/PDIF Optical Digital Audio Output connection: Combination Output S/PDIF Optical Digital Audio Input connection: Combination Input Any ideas how I can successfully get recording working?

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• ruby: invalid opcode

  - by adamo

  There's a fairly complex application than runs on two VMs (on Xen). Both VMs run CentOS 6.2 with the exact same packages and configuration for every application running (minus networking which is different). SELinux is disabled on both. On machine A the application builds perfectly. On machine B when running some tests we get: ruby[2010] trap invalid opcode ip:7ff9d2944c30 sp:7fff9797e0f8 error:0 in ld-2.12.so[7ff9d2930000+20000] Digging a bit more to find out where the machines differ, machine A has: model name : Six-Core AMD Opteron(tm) Processor 2423 HE and machine B: model name : AMD Opteron(TM) Processor 6272 I've tried booting machine B with cpuid_mask_cpu=fam_10_rev_c in grub but it did not help either. So any advice as to how to deal with this, or how to approach the hosting provider so as to run this VM on another physical machine will be greatly appreciated.

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• Adding new users

  - by user36651

  I have an FTP server that is running Fedora Core release 6 (Zod) the problem is I need to create new users and I have root access saved in WinSCP, so I can run useradd or adduser via the fake terminal, but every time I try to use passwd <username> it crashes on me and won't allow me to change or add a password. my questions are this: --Is there a place the adduser script stores the default passwords? or what is the default? --Is there another way I can set passwords for new users? I don't want to change the root pass because EVERYONE has root access and it's saved in WinSCP (I'm sure you see the problem here...) I want to create User accounts for each user instead of giving them all blatant root access. the goal here is to gradually migrate everyone over to their new account and then change the root p/w. Any suggestions would be greatly appreciated.

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• iis 7.5windows 7 error 500.19 error code=0x800700b7

  - by nikhiljoshi

  hi friends i have been trying to resiolve this issue can you guys pls help me for same i am using windows 7 and vs2008 +iis7.5 i have my project stucked pls reply here is what error says Error Summary HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. Detailed Error Information Module IIS Web Core Notification BeginRequest Handler Not yet determined Error Code 0x800700b7 Config Error There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined Config File \?\C:\inetpub\wwwroot\test23\web.config Requested URL http://localhost:80/test23 Physical Path C:\inetpub\wwwroot\test23 Logon Method Not yet determined Logon User Not yet determined Config Source 15: 16: 17: i have tried to do the solution given in this site of microsoft http://support.microsoft.com/kb/942055

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• Virtualbox PXE Boot Failing with a Windows Server 2008 R2 Server

  - by Vbitz

  Some fast help on this would be good, I have been on this problem for 14 hours. In a Virtualbox test environment I have 2 virtual machines networked together using a internal network (no traffic runs though the host, it is all at a software level). One is a fresh client with 512mb of ram and a dual core set-up, the other is the server with 1.5GB of ram and running server 2008 r2. The server is configured as a dns server, dchp server, domain controller and also serves PXE booting though WDS (Windows Deployment Services). Both machines can see each other and I am able to start a network boot. The issue comes at the second to last stage of the pre windows PE install. On TFTP download of boot.sdi it starts it but stops during the boot process.

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• Problem with xvideoservice thief

  - by Nrew

  Xvideo service thief is an application that allows you to download and convert youtube videos into .avi format. The problem is when it tries to convert the .flv into a .avi. The audio in the video is not being played when you try to play the video. But the .flv works fine. I have also enabled Intel(R) speedstep feature in my processor(Pentium Dual core E5200) to decrease the power consumed by the processor with the help of Granola software. What might be the reason for the audio less video converter by xvideo service thief? Could it be the enabling of intel(R) speedstep? Because the software works fine when its not enabled. Is this possible?That the output some applications can be altered when enabling this processor feature?

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• Recommended CPU upgrade for Dell Vostro 220 with E7300 processor?

  - by Justin Grant

  I've got a Dell Vostro 220 with an E7300 processor (Intel Core 2 Duo @ 2.66Mhz, LGA775 socket) and I'm thinking about upgrading my processor so I can run Windows Server 2008 R2 with Hyper-V, which requires Hardware Virtualization support in the processor. Yes, I know this is underpowered for a server, I'm actually using it as a desktop machine but I'd like to use Hyper-V instead of Virtual Server (which I'm using now for running VMs). I'd like to keep the same motherboard and ideally the same CPU fan and RAM too. Any suggestions for a good, relatively cheap (under $200) processor upgrade?

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• MAC OS for Intel based PCs

  - by Maven

  I have an Intel dual core PC with 4GB of RAM and Graphics card. For on of my student Assignment I need to install Latest possible MAC OS on my system as a secondary OS. Like on boot it asks me that which OS i want to boot with Win 8.1 or Mac Os.. I searched on the internet and found two conflicting opinion some people said there are few MAC OS Version which can be directly installed on Intel PCs some says there aren't? I am here to get rid of the confusion that is an official latest possible MAC OS version for Intel based PCs? If not what are my options if I want to run MAC OS on my PC. Please not that Virtualization options won’t work for me, it has to be working as full OS not an os inside another.

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• Do you have any additions or alterations to this list of popular audio formats?

  - by roja

  All, I am trying to compile a list of common audio file formats used in both personal storage and peer transmission. I have compiled the following list, do you think that there are any significant formats missing? Are any of them not actually common formats? Any advice/alterations are highly useful. advanced audio coding, apple lossless audio file, atrac3 audio file, atrac audio file, audio interchange file format, core audio file, free lossless audio codec file, mpeg 1 audio layer 3, mpeg 2 audio, mpeg 4 audio book file, musical instrument digital interface, ogg vorbis compressed audio file, open media framework file, real audio, real audio media, waveform audio file format, windows media audio Kind regards, Roja

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• Thinkpad CPU temperature reaches 100°C after 10 minutes of heavy use

  - by Nicolas Raoul

  Less than two years ago, I bought a Lenovo Thinkpad R500. When using the CPU heavily, it sometimes decides to reboot. I am using Linux, and a widget shows me the CPU temperature. The PC usually reboots when the temperature of the first core gets over 100°C Since I switched from Ubuntu 2010.10 32bit to Ubuntu 2011.04 64bit, it crashes much more often. I survive using these techniques: When in the office, I use a laptopcooler. When outside, I underclock to 800 MHz, by doing so it does not get too warm. QUESTION: Is it normal that a Thinkpad crashes if the CPU is at 100% for more than 10 minutes? How can I use the full power of my computer, for instance when showing CPU-hungry business intelligence tools to clients? The computer does not really feel that hot. Maybe the sensor itself is reporting wrong temperatures? Can I tell the BIOS to ignore it?

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• Chrome pegs CPU playing YouTube videos

  - by AngryHacker

  I am not sure when this started, but the issue definitely exists in the latest version of Chrome (10.0.648.127). Playing youtube video at 320p essentially pegs the CPU. The process that kills is WindowServer which takes up the lion's share of the CPU. When I close the tab, everything goes back to normal. If I try this in Safari or Firefox, CPU usage is within acceptable levels. I am on a 2-3 year old MacMini, which is not the latest, but runs most apps fine. 1.83Mhz Intel Core 2 Duo. Is there a setting within Chrome I can set to fix this issue?

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• A good Linux alternative to Ubuntu for a working environment.

  - by Roozak

  Hi, Im running a decent laptop with 3GB ram and 2GHz Core Duo. I use it mainly for working which requires several SSH and SFTP connections to servers and running a VM most of the time. Nothing much more intensive than that. I like using Ubuntu 9.10 however I have the issue of Nautilus and the top/bottom menus freezing up on me constantly - dare I say it, alot more problems than when I was using Windows Vista. Im just looking for recommendations of other operating systems which would be suitable for the task. Thanks

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• Amazon EC2 performance vs desktop

  - by flashnik

  I'm wondering how to compare performance of EC2 instances with standard dedicated servers and desktop. I've found only comparance of defferent clouds. I need to find a solution to perform some computations which require CPU and memory (disc IO is not used). The choice is to use: EC2 (High-CPU) or Xeon 5620/5630 with DDR3 or Core i7-960/980 with DDR3 Can anybody help, how to compare their performance? I'm not speaking about reliability of alternatives, I want to understand pros and cons from the point of just performance.

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• NTFS write speed really slow (<15MB/s) on Ubuntu

  - by Zulakis

  When copying large files or testing writespeed with dd, the max writespeed I can get is about 12-15MB/s on drives using the NTFS filesystem. I tested multiple drives (all connected using SATA) which all got writespeeds of 100MB/s+ on Windows or when formatted with ext4, so it's not an alignment or drive issue. top shows high cpu usage for the mount.ntfs process. AMD dual core processor (2.2 GHz) Kernel version: 3.5.0-23-generic Ubuntu 12.04 ntfs-3g version: both 2012.1.15AR.1 (Ubuntu default version) and 2013.1.13AR.2 How can I fix the writespeed?

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• Hyperthreading vs. SQL Server & PostgreSQL

  - by IanC

  I have read that hyperthreading is a "performance killer" when it comes to DBs. However, what I read didn't state which CPUs. Further, it mostly indicated that I/O was "cut to < 10% performance". That logically doesn't make sense since I/O is primarily a function of controllers and disks, not CPUs. But then no one ever said bugs made sense. What I read also stated that SQL Server could put two parallel query ops onto 1 logical core (2 threads), thereby degrading performance. I have a hard time believing SQL Server's architects would have made such an obvious miscalculation. Does anyone have and data on how hyperthreading on current generation CPUs affects either of the RDBMSs I mentioned?

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• Will new Acer Revo (with Atom 330) be fast enough to be MythTV client/server?

  - by vava

  As a geek I really like Atom CPUs but can't find a reason to buy one yet :( Although I was thinking about making my own DVR with NAS and media center functionality. Unfortunately, even today's Acer Revo, built on ION platform is not fast enough for streaming Full HD videos. So what do you think, will new two core CPU make it better, will it be able to show Full HD videos, store them to disk and transfer something over the network at the same time? Will it be able to scale videos from Hulu and YouTube to fullscreen?

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