Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much, -=- adam grossman
On Wed, Feb 17, 2010 at 2:07 PM, Adam Grossman adam.grossman@devitron.comwrote:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
I assume you taskset, isn't it? If affinity is inherited, does setting affinity for init process to a fixed set of processors make sense?
i tried using taskset to set pid 1 and the pid of $$ to the processors i wanted, but that did not work.
On Wed, 2010-02-17 at 15:13 -0300, Eduardo Grosclaude wrote:
On Wed, Feb 17, 2010 at 2:07 PM, Adam Grossman adam.grossman@devitron.com wrote: Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.I assume you taskset, isn't it? If affinity is inherited, does setting affinity for init process to a fixed set of processors make sense?
-- Eduardo Grosclaude Universidad Nacional del Comahue Neuquen, Argentina _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Adam Grossman sent a missive on 2010-02-17:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much,
Have you considered running through the pids of the all tasks and then using taskset to change their affinities. You could also change all the init scripts to invoke the process using something like "taskset -p [mask] [pid]" and limit the mask to only the first few CPU's that you want them to have access to.
On Wed, 2010-02-17 at 18:17 +0000, Simon Billis wrote:
Adam Grossman sent a missive on 2010-02-17:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much,
Have you considered running through the pids of the all tasks and then using taskset to change their affinities. You could also change all the init scripts to invoke the process using something like "taskset -p [mask] [pid]" and limit the mask to only the first few CPU's that you want them to have access to.
that's probably a good idea. have it be the last service that runs which moves everything to the processors i want. i am going to give that an try.
thank you very much, -=- adam grossman
On Wed, 2010-02-17 at 13:26 -0500, Adam Grossman wrote:
On Wed, 2010-02-17 at 18:17 +0000, Simon Billis wrote:
Adam Grossman sent a missive on 2010-02-17:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much,
Have you considered running through the pids of the all tasks and then using taskset to change their affinities. You could also change all the init scripts to invoke the process using something like "taskset -p [mask] [pid]" and limit the mask to only the first few CPU's that you want them to have access to.
that's probably a good idea. have it be the last service that runs which moves everything to the processors i want. i am going to give that an try.
i was asked to do this for increased performance. but does centos have any SMP load balancing which would probably work better then manually doing load balancing?
thanks, -=- adam grossman
Adam Grossman sent a missive on 2010-02-17:
On Wed, 2010-02-17 at 13:26 -0500, Adam Grossman wrote:
On Wed, 2010-02-17 at 18:17 +0000, Simon Billis wrote:
Adam Grossman sent a missive on 2010-02-17:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much,
Have you considered running through the pids of the all tasks and then using taskset to change their affinities. You could also change all the init scripts to invoke the process using something like "taskset -p [mask] [pid]" and limit the mask to only the first few CPU's that you want them to have access to.
that's probably a good idea. have it be the last service that runs which moves everything to the processors i want. i am going to give that an try.
i was asked to do this for increased performance. but does centos have any SMP load balancing which would probably work better then manually doing load balancing?
Linux does have cpu load balancing to maximise performance, but performance of an application/process relies on many things. You may have to tune the system for that particular application and also reduce the number of other processes running to maximise the performance. Application tuning may also be required for maximum performance gains.
From: Simon Billis simon@houxou.com
To: CentOS mailing list centos@centos.org Sent: Thu, February 18, 2010 11:25:41 AM Subject: Re: [CentOS] processor affinity
Adam Grossman sent a missive on 2010-02-17:
On Wed, 2010-02-17 at 13:26 -0500, Adam Grossman wrote:
On Wed, 2010-02-17 at 18:17 +0000, Simon Billis wrote:
Adam Grossman sent a missive on 2010-02-17:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much,
Have you considered running through the pids of the all tasks and then using taskset to change their affinities. You could also change all the init scripts to invoke the process using something like "taskset -p [mask] [pid]" and limit the mask to only the first few CPU's that you want them to have access to.
that's probably a good idea. have it be the last service that runs which moves everything to the processors i want. i am going to give that an try.
i was asked to do this for increased performance. but does centos have any SMP load balancing which would probably work better then manually doing load balancing?
Linux does have cpu load balancing to maximise performance, but performance of an application/process relies on many things. You may have to tune the system for that particular application and also reduce the number of other processes running to maximise the performance. Application tuning may also be required for maximum performance gains.
What about renicing processes...?
JD
John Doe wrote:
From: Simon Billis simon@houxou.com
To: CentOS mailing list centos@centos.org Sent: Thu, February 18, 2010 11:25:41 AM Subject: Re: [CentOS] processor affinity
Adam Grossman sent a missive on 2010-02-17:
On Wed, 2010-02-17 at 13:26 -0500, Adam Grossman wrote:
On Wed, 2010-02-17 at 18:17 +0000, Simon Billis wrote:
Adam Grossman sent a missive on 2010-02-17:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much,
Have you considered running through the pids of the all tasks and then using taskset to change their affinities. You could also change all the init scripts to invoke the process using something like "taskset -p [mask] [pid]" and limit the mask to only the first few CPU's that you want them to have access to.
that's probably a good idea. have it be the last service that runs which moves everything to the processors i want. i am going to give that an try.
i was asked to do this for increased performance. but does centos have any SMP load balancing which would probably work better then manually doing load balancing?
Linux does have cpu load balancing to maximise performance, but performance of an application/process relies on many things. You may have to tune the system for that particular application and also reduce the number of other processes running to maximise the performance. Application tuning may also be required for maximum performance gains.
What about renicing processes...?
JD
Hi
I don't this helps, but in the BIOS of Dell Precision I have to option of choose the memory management to be SMP or NUMA, the default is SMP. If you choose to NUMA than you have a better affinity.
Regards
mg.
John Doe sent a missive on 2010-02-18:
From: Simon Billis simon@houxou.com
To: CentOS mailing list centos@centos.org Sent: Thu, February 18, 2010 11:25:41 AM Subject: Re: [CentOS] processor affinity
Adam Grossman sent a missive on 2010-02-17:
On Wed, 2010-02-17 at 13:26 -0500, Adam Grossman wrote:
On Wed, 2010-02-17 at 18:17 +0000, Simon Billis wrote:
Adam Grossman sent a missive on 2010-02-17:
Hello,
i am running CentOS 5.4. i have a requirement where i need to have 1 application have a single processor all to its self, and the rest of the system run on the other processors. "taskman" lets me bind the process to a processor(s), but it does not make it exclusive. Is this possible to do? i have even tried mucking around with the rc.sysinit, but to no avail.
thank you very much,
Have you considered running through the pids of the all tasks and then using taskset to change their affinities. You could also change all the init scripts to invoke the process using something like "taskset -p [mask] [pid]" and limit the mask to only the first few CPU's that you want them to have access to.
that's probably a good idea. have it be the last service that runs which moves everything to the processors i want. i am going to give that an try.
i was asked to do this for increased performance. but does centos have any SMP load balancing which would probably work better then manually doing load balancing?
Linux does have cpu load balancing to maximise performance, but performance of an application/process relies on many things. You may have to tune the system for that particular application and also reduce the number of other processes running to maximise the performance. Application tuning may also be required for maximum
performance gains.
What about renicing processes...?
JD
I personally would only renice my processes - most system processes need to run at a higher priority than user tasks so things dont break. They also only utilise a very small proportion of the system so "should" be negligible in most instances. In my experience understanding what your application is doing provides the insight into tuning the system for maximum performance.
-
Adam Grossman -
Eduardo Grosclaude -
John Doe -
Marcelo M. Garcia -
Simon Billis