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Subject: Re: [OMPI devel] Fwd: [OMPI bugs] [Open MPI] #1250: Performance problem on SM
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-07-23 11:51:41


Yes, it may well be...

It needs to handle the case where paffinity can return "Sorry, I don't
have this information for you."

On Jul 23, 2008, at 11:40 AM, Lenny Verkhovsky wrote:

> can this also be a reason for seqv on NUMA nodes(#1382) , that I
> cant recreate ?
>
> On 7/23/08, Jeff Squyres <jsquyres_at_[hidden]> wrote: On Jul 23,
> 2008, at 10:37 AM, Terry Dontje wrote:
>
> This seems to work for me too. What is interesting is my
> experiments have shown that if you run on RH5.1 you don't need to
> set mpi_yield_when_idle to 0.
>
> Yes, this makes sense -- on RHEL5.1, it's a much newer Linux kernel
> and PLPA works as expected there. So ODLS uses the values that PLPA
> passes back and all is good.
>
> On older Linux kernels, we're effectively returning "not supported"
> from paffinity, and therefore ODLS (rightly) assumes that it can't
> know anything and puts us into the "oversubscribed" state.
>
> I'm working on a fix.
>
>
> --
> Jeff Squyres
> Cisco Systems
>
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-- 
Jeff Squyres
Cisco Systems