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Subject: Re: [OMPI devel] OpenMPI, PLPA and Linux cpuset/cgroup support
From: Ralph Castain (rhc_at_[hidden])
Date: 2009-07-24 07:00:29


Ummm....I'll let you guys work this out on PLPA. However, just to
clarify, OMPI currently binds to cores, not logical cpus. It is the
PLPA that is "dumb" and provides the plumbing to do what OMPI tells it.

:-)

On Jul 24, 2009, at 2:18 AM, Chris Samuel wrote:

>
> ----- "Jeff Squyres" <jsquyres_at_[hidden]> wrote:
>
>> PLPA does not currently deal with cpusets.
>
> I think it can get close enough if it assumes that
> its initial affinity list is the subset of cores that
> it can choose from when setting CPU affinity.
>
> As for whether OMPI or PLPA should choose, I suspect
> it's better if OMPI continues to be dumb and say "bind
> me to CPU n" and PLPA works out what CPU 'n' works
> out to be in terms of actual cores it can access.
>
> But I'll take the rest of this to the PLPA list. :-)
>
> cheers,
> Chris
> --
> Christopher Samuel - (03) 9925 4751 - Systems Manager
> The Victorian Partnership for Advanced Computing
> P.O. Box 201, Carlton South, VIC 3053, Australia
> VPAC is a not-for-profit Registered Research Agency
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