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 <b...@cc.dtu.dk> 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:t...@pasteur.fr | tel/fax +33 1 45 68 87 37/19 Institut Pasteur, 25-28 rue du Docteur Roux, 75724 Paris CEDEX 15 France
