[CentOS] processor affinity

[John Doe]

From: Simon Billis <simon at houxou.com>
> To: CentOS mailing list <centos at 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