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Subject: Re: [OMPI devel] Fwd: [OMPI bugs] [Open MPI] #1250: Performance problem on SM
From: Lenny Verkhovsky (lenny.verkhovsky_at_[hidden])
Date: 2008-07-23 11:40:36


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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