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Subject: Re: [OMPI devel] OpenMPI, PLPA and Linux cpuset/cgroup support
From: Ralph Castain (rhc_at_[hidden])
Date: 2009-07-25 00:11:04


Perhaps a telecon (myself, Jeff S, and you) would be best at this
stage. I confess I'm now confused too - what you describe is precisely
what we already do.

Let me know when you are available and we'll try to work out a time -
might as well do that off list so we don't bang everyone's inbox.

On Jul 24, 2009, at 7:57 AM, Chris Samuel wrote:

> Hi Ralph,
>
> ----- "Ralph Castain" <rhc_at_[hidden]> wrote:
>
>> 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.
>>
>> :-)
>
> Ahh, if that's the case then this isn't something that PLPA
> needs to be involved in then! I'm getting confused here,
> haven't had a coffee since Monday, must be the reason. :-)
>
> What we really want is for the usual execution of:
>
> mpiexec /path/to/my/code $arguments
>
> to launch via the PBS TM API, work out what cores are
> available to it on the nodes assigned to it and then
> bind appropriately to them. Easy, see.. ;-)
>
> 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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