Re: Memory problems
On 06/02/2010 09:06 AM, Jonatan Soto wrote: Hi list, I'm facing a problem with lenny regarding to memory usage. I have 4 VM lenny based on top of a VMWare ESXi. The system is running for a few days and top command shows a very high amount of memory consumption for each server. I have a little knowledge of how linux (kernel 2.6) manages memory. A nice resource I found is this: http://www.linuxhowtos.org/System/Linux%20Memory%20Management.htm So, I understand that cached memory may be free if some application requires it but I don't understand why lenny is consuming 2GB of physical memory. It's worth to mention that all the systems are running with only the standard package installed and few additional daemons for each server. I post what top command shows in order to provide better clues of what's going on: Server1: top - 18:47:12 up 12 days, 3:57, 2 users, load average: 0.00, 0.00, 0.00 Tasks: 53 total, 2 running, 51 sleeping, 0 stopped, 0 zombie Mem: 3097764k total, 2901684k used, 196080k free, 156460k buffers Swap: 578300k total,0k used, 578300k free, 592736k cached additional daemons - apache2, bind9, sshd Server2: top - 18:48:30 up 12 days, 2:29, 2 users, load average: 0.00, 0.00, 0.00 Tasks: 55 total, 1 running, 54 sleeping, 0 stopped, 0 zombie Mem: 3097764k total, 2412008k used, 685756k free, 145204k buffers Swap: 915664k total,0k used, 915664k free, 155112k cached additional daemons - apache2, sshd Server3: top - 18:52:10 up 12 days, 2:32, 2 users, load average: 0.00, 0.00, 0.00 Tasks: 72 total, 1 running, 71 sleeping, 0 stopped, 0 zombie Mem: 3097764k total, 2263200k used, 834564k free,49152k buffers Swap: 2928632k total,0k used, 2928632k free, 107700k cached additional daemons - lvm, sshd Server4: top - 16:50:19 up 1 day, 6:42, 2 users, load average: 0.00, 0.00, 0.00 Tasks: 58 total, 1 running, 57 sleeping, 0 stopped, 0 zombie Mem: 3097764k total, 272300k used, 2825464k free, 126164k buffers Swap: 1341388k total,0k used, 1341388k free,53196k cached additional daemons - bind9, sldap, samba, sshd I like to think of the drive cache as the computer saying We'll hold onto this information you read from the hard drive in memory just in case you want to use again soon. The memory wouldn't be doing anything if empty anyways. Essentially I count cache as free memory because the OS will drop it in a heartbeat if an application needs it. Also, it is reasonable that the cache increases as the uptime does because the computer reads more from the hard drive that can be cached as time goes on. Brian Oborn Note that I've recently rebooted Server4 and it has lower memory consumption rather than the others and it is running more daemons. May be this issue is a misconfiguration of my servers or a memory leak? Should I tweak something in order to improve memory management? Any help would be much appreciated. PD: Apache2 is installed using default configuration of the Apache2 official Debian release. -- To UNSUBSCRIBE, email to debian-amd64-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4c0676f7.6070...@iac.isu.edu
Re: C.P.U. suggestions.
Douglas A. Tutty wrote: On Wed, Jun 11, 2008 at 11:20:25PM -0700, Chris Wakefield wrote: To my dissappointment my 'AMD 64 X2 Dual Core 3800' has been a ho-hum experience; don't know if it's the scheduler with the default debian compile that seems to effect the performance, but it's certainly nothing to write home about. .I actually found my original AMD 64 Processor 3200+ (the one with 1 MiB L2 cache) to be probably the best CPU I ever had and I think just as capable as my X2. What software do you run that stresses your current CPU? Do you not get I/O bound? How much memory do you need? Intel shares the memory controller with each CPU whereas AMD gives you a memory controller built into each CPU (core?). Doug AMD has a dedicated memory controller for each CPU, but that memory controller is shared between all cores on the same CPU. Intel x86-64 CPU's generally have one memory controller shared between all the CPUs in a system and can get into memory bandwidth starvation with multiple CPU systems, especially with 4-sockets. None of this matters for single-CPU, multiple core desktop systems though. Also, for what it's worth, I use XFS on several large storage machines, the head node for a Beowulf cluster, and all my desktops. Brian -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: linux-image-2.6.18-6-amd64 kernel installed, but am I running a 64-bit system?
Neil Stewart wrote: Thank you all very much for all of your help. I think you've solved this one. I do _seem_ to be running a 32-bit system after foolishly using a 32-bit CD. But one small point: How can I get the system to report which type it is? uname -a does not seem to work. I like to use the file command: [EMAIL PROTECTED]:~$ file /bin/bash /bin/bash: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.0, dynamically linked (uses shared libs), for GNU/Linux 2.6.0, stripped (the /bin/bash can be any compiled executable or library) Hope this helps Brian -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: [Help] Installing etch on dual opteron cluster head node
On our Opteron cluster I have a full Debian Sarge 64-bit install and a full Debian Sarge chroot on the head node. I've found that sometimes it's difficult (if not impossible) to compile 32-bit applications in the 64-bit install because of odd library dependencies. Brian Oborn Idaho Accelerator Center Idaho State University Bharath Ramesh wrote: Our dual opteron server which is to function as a head node has arrived and I want to run debian amd64 on the head node. We need to be able to compile both 32-bit and 64-bit applications on this node. Technically this node will not execute any application. The idea is to run sid/etch on the machine. Scanning the mailing list archives I assume the only package that needs to be installed for 32-bit applications to be compiles is libc6-dev-i386. I would really appreciate any advice on this from past experiences the developers and users might have had. Thanks, Bharath --- Bharath Ramesh [EMAIL PROTECTED] http://people.cs.vt.edu/~bramesh -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: Filesystem stability?
We've been running ReiserFS on a Debian Opteron cluster head node (4TB hardware RAID), on another Debian Opteron backup machine (1.5TB on several drives), and on several 32-bit Debian boxes without any issues... Brian Oborn Cameron Patrick wrote: Mark Ferlatte wrote: What filesystems are you guys using, and anyone had any bad experiences? I'm a big fan of reiserfs but have heard problems with people using it on amd64 (and also alpha, which suggests it might be a general 64-bit cleanliness issue). Cameron. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
