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Subject: Re: [OMPI users] slowdown with infiniband and latest CentOS kernel
From: Tru Huynh (tru_at_[hidden])
Date: 2014-03-01 18:44:16


On Fri, Feb 28, 2014 at 08:49:45AM +0100, Bernd Dammann wrote:
> On 2/27/14 16:47 PM, Dave Love wrote:
> >Bernd Dammann <bd_at_[hidden]> writes:
> >
> >>Hi,
> >>
> >>I found this thread from before Christmas, and I wondered what the
> >>status of this problem is. We experience the same problems since our
> >>upgrade to Scientific Linux 6.4, kernel 2.6.32-431.1.2.el6.x86_64, and
> >>OpenMPI 1.6.5.
> >>
> >>Users have reported severe slowdowns in all kinds of applications,
> >>like VASP, OpenFOAM, etc.
> >
> >I'm surprised a kernel change should be related to core binding, if
> >that's the issue, or caused your slowdown. We were running that kernel
> >OK until recently with those sort of applications and that OMPI version.
>
> Maybe I should say, that we moved from SL 6.1 and OMPI 1.4.x to SL
> 6.4 with the above kernel, and OMPI 1.6.5 - which means a major
> upgrade of our cluster.
>
> After the upgrade, users reported those slowdowns, and a search on
> this list showed, that other sites had the same (or similar issues)
> with this kernel and OMPI version combination.

afaik, 2.6.32-431 series is from RHEL(and clones) version >=6.5
otoh, it might be related to http://bugs.centos.org/view.php?id=6949

Cheers

Tru

-- 
Dr Tru Huynh          | http://www.pasteur.fr/recherche/unites/Binfs/
mailto:tru_at_[hidden] | tel/fax +33 1 45 68 87 37/19
Institut Pasteur, 25-28 rue du Docteur Roux, 75724 Paris CEDEX 15 France