OpenSUSE :: Advanced Processor Affinity Practice?
Oct 27, 2010
Am investigating processor affinity theory and practice, am somewhat surprised at the paucity of information on something that has been a part of many Windows Enterprise type applications for more than a decade and although I haven't investigated would assume is supported by big iron UNIX.What it is Processor Affinity is the *NIX terminology for "soft" assigning a process and its threads to a specific processor core. On multi-tasking machines and particularly those which run heavy loads it can be useful to "advise" the Scheduler to isolate/assign heavy loads to a core separate from other processes. I also have a specific situation where I would like to run more than one instance of a specific app, but cannot when sharing the same processing environment.
What I've found so far By default, any and all processes are assigned an affinity that permits running on any and all available processors.The taskset utility can be used to modify the affinity for any process, which means that once an application/service/process has been launched, only then can the affinity be modified.It seems that the RH platform may also have a utility called tuna which might provide some tuning capabilities in addition to setting affinity but does not seem to be in the SuSE repositories and I cannot find source.Is there a reference or utility that can launch an application with a specified processor affinity?
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Oct 28, 2009
Does anyone know if there is a way to "unset" processor affinity? So if you bind a process to just one proc, but then want to tell the OS to revert to normal behavior? Also, when you bind a process to a processor, can other processes use that process or does it have exclusive usage of that proc?
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Jan 28, 2010
there is any possibility that I can set in this application an affinity so that the processor binds it to core 2 for instance.Is this possible to do in an application that runs than under root? Or is this just possible after the application started with using the taskset tool?
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Aug 7, 2010
I have some questions.First, how can i obtain a process execution time ( after it terminated)??? Second, in a multi-core system like SMP how can i run different processes on different cores explicitly? i.e. how can i assign a process to a specific core?
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Aug 12, 2010
I'm trying to create a user account for my children in Ubuntu 10.04
When creating their account, I have turned off the 'Connect to ethernet and wireless' option of the Advanced Settings.
However, when I log into their accounts, they still have full access to the internet through both the wireless and ethernet connections. Is this option for some other purpose?
Is there an alternate way to limit internet access for childrens' accounts in Ubuntu? (I'm used to MS Family Safety as a filter for internet access - is there an eqivalent for Ubuntu?)
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Jan 5, 2010
i have installed ubuntu in my laptop.since i have AMD processor fedora doesnt support AMD processor..the recent version fedora 12 supprots AMD processor.i am doing my final project in ns2 hence it should support tht too!!! Which is the best choice to override ubuntu grub fedora 12 or redhat linux.
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Dec 18, 2009
I have a question about using taskset. I am using Core 2 Quad box. I set the default affinity to CPU 0, by doing the following:
Edit: /etc/rc.d/rc.sysinit
Addline: /bin/taskset -p 1 0
That has been working fine for me, but from searching the web, I found some suggestion about adding an additional line:
/bin/taskset -p 1 $$
What does that line do?
I checked the man page of taskset and some references for regular expression, and I couldn't find the explanation about the $ character. By the way, 0 for CPU 0, correct? I checked via htop and seemed to be correct...
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May 20, 2011
Upon trying to open a .wmv file, the system says it wants the above - which I suspect is not provided under the same name and is proprietary. Can anyone suggest the name of a plugin in the repository which would suffice? The file came as an attachment to an email file.
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Apr 29, 2010
I am using glib version 1.2.10.I came to know from somewhere that "pthread_attr_setaffinity_np(3)" does not work on this version for POSIX threads. Following error was coming:(.text+0x112): undefined reference to `pthread_attr_setaffinity_np'collect2: ld returned 1 exit status.All I want to do is to run 2 threads on two different processors. I cannot change the glib version.
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Feb 20, 2010
I have a program for which it seems to be impossible to set cpu affinity from launch with the command taskset -c <cpu list> <command> <arguments>
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Jan 24, 2011
I have a 8 core computer, which has 8 logical processor in total. I want to create 8 process(nodes). Each node is mapped to each logical processor. The order is code...
I wrote the code as below, could you please see whether it is correct? code...
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May 16, 2011
I have a problem with kmix, which uses 100% of my processor without stopping. And this is providing to rise of temperature above 80 degrees Celsius. The problem became actual after one of updates of 11.4 series.
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Aug 23, 2010
Are there any tools available in openSUSE for evaluating cpu/processor performance. My processor/cpu is under warranty til end of October, will like to know whether I need to get new one or i am good. I am looking for something that can log an event and report. Have tried stress and crashme but they dont show any results.
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Mar 4, 2011
i have a OpenSUSE 11.3 with Gnome desktop ( core i5 processor, 2 GB DDR3 RAM ) want to run memtest, plz advice me which prog is best for it and where to find documentation or videos.Moreover is there any tests for motherboard / processor
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Jul 12, 2010
I am starting a new job, and need to brush up on my expect scripting. does anyone know of any online resources, e.g. telnet sites that I can play about with?
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Apr 22, 2011
I have searched the net for The Best Practice of C-Style Stings, but the examples i have found aren't sufficient.Can someone please show me The Best Practice for C-Style Stings, or direct me to something i can read that shows in details the best practice.
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Jun 22, 2010
I am using suse for a long time but I did not yet experience this strange error:
I installed 11.2 and now 11.3RC1 on a new HW: ASUS M4N72-E with AMD Phenom2 X4 965, 8GB Memory, standard settings.
I experienced unusual errors when copying large files to the new system with scp/ssh (connection broken).
Even stranger I could not read .tgz files created on the older machine, same OS 11.2, but MB ASUS M2N32-SLI with AMD Phenom X4 9850
Testing further reveals that if I create a .gz file from the same source it produces every time a different output:
-rw-r--r-- 1 root root 3875041280 Jun 21 01:51 wwtest.tar
-rw-r--r-- 1 root root 1326141906 Jun 21 01:55 wwtest1.tar.gz
-rw-r--r-- 1 root root 1326137319 Jun 21 03:26 wwtest2.tar.gz
-rw-r--r-- 1 root root 1326146273 Jun 22 07:32 wwtest3.tar.gz
[Code].....
I never saw something like it, I guess it must be something with the underlying library not working on the new processor. I tried with slower memory speed, newest BIOS etc ...always the same errors. Other wise the system works absolutely stable.
When I compare the generated files with one created on the older system it looks like there are single bits missing in a random number of bites.
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Jun 13, 2011
I consider building a new computer using a mainboard with support for two processors. I wish to do this to improve performance of course, specifically in regards to audio production. Though, what I would like to know is if anyone has some experience with using such a hardware on an ordinary desktop system and if there are some general implications I should be aware of?
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Jul 28, 2010
If opensuse will run on a notebook with an Intel atom processor?
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Nov 29, 2010
Recently I've been going over a few resources (like Guide to the Secure Configuration of Red Hat Enterprise Linux 5) some forum members have provided and I've been using other resources I use for work (like the UNIX STIG requirements). I would like to improve my skill-set on hardening a linux server (for work and personal interest). Is there a specific linux distro I can install that is purposely corrupted/vulnerable where the sole goal is to secure it, and then have the means to scan it to make sure all vulnerabilities are patched and secured?
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Mar 31, 2010
I've only ever installed two programs that came in .tar.gz's with their own install.sh scripts. Each one recommended to be saved in /opt.What is opt? Should all .tar.gz programs with their script installer be handled in the opt directory?
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Aug 21, 2009
I was about to post a new thread and saw that there are several answers out here already and I have done the new group permission one on my server -- actually on my test server I just added "my user" to the group "root" to gain rw access to /var/www/htdocs/.Someone suggested that the proper way might be to do symlinks to the directory in a real production environment and I wanted to find out if that is the *best* way to go or whether to actually make a group "www_admin" (pick your favorite flavor of this) and add my users to that group?
I guess I am looking for the "best practice" in a real corporate production environment that is most secure.
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Apr 9, 2011
I am new to Slackware but I'm a bit familiar with Ubuntu. I normally partition my ubuntu using /swap, /root and /home. In ubuntu it is recommended to separate /home and /root partitions so that later on if something to be changed in the system we just need to apply on that /root without affecting our old data in /home. Is it the same way in Slackware applied? If so, is it the same as having /swap, /root and /home partitions as well? Can anyone suggest for the harddisk distribution of my 320GB space..
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Dec 20, 2009
Basically system monitor and the "top" command show 2 cpu cores when I only have 1 (a 3 Ghz P4 on my work computer).
I'm not sure if the two are related but I frequently get 100% CPU usage when running a few programs together (Kile, Firefox, Chrome and okular for example) at which point even the movement of the mouse cursor slows down.
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Sep 6, 2011
Kmix seems gone crazy,always consume 100% of one processor,during video playing with SMplayer or Kaffein,even the playing stopped,player closed,it still keep running.
I'm using 11.4 x86 KDE.
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Mar 10, 2010
I am currently studying for the Linux plus comptia exam.
Yes, Im aware, The theme OS is Redhat. I am just wondering if there are any free practice exams for the linux plus certification out there. Any Ideas?
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May 23, 2011
I'm writing you to ask some help with administrating a server remotely.
I have a machine I use remotely when I have to travel, some time for quite long periods like from one to three months.
Last time it happened to me that after upgrading I send the reboot command
and the machine didn't turn down, so I couldn't be able to access it.
My question is: how can I avoid such situations?
Is there any best practice to follow?
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Jul 18, 2011
I want to practice setting up of NFS server and NFS client on Redhat using virtual machine on my laptop. I dont think setting up NFS should not be a problem but how do I replicate a NFS client. I just have one laptop. Is it possible to replicate both server and client using the same laptop? If so, can anyone tell what tools i can use to perform the above for practicing.
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Jun 5, 2010
how to set server like facilities on home pc to practice for RH 133 & RH 253 for RHCE exam.
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Dec 26, 2009
I'm about to upgrade a server for a local non-profit, and am looking at a Gigabyte GA-P55-UD3L motherboard and an Intel Core i5 750 processor. Does anyone have any observations or experiences with SUSE on this platform?
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