> On Apr 9, 2017, at 1:49 PM, Reuti <re...@staff.uni-marburg.de> wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi, > > Am 09.04.2017 um 16:35 schrieb r...@open-mpi.org <mailto:r...@open-mpi.org>: > >> There has been no change in the policy - however, if you are oversubscribed, >> we did fix a bug to ensure that we don’t auto-bind in that situation >> >> Can you pass along your cmd line? So far as I can tell, it still seems to be >> working. > > I'm not sure whether it was the case with 1.8, but according to the man page > it binds now to sockets for number of processes > 2 . And this can lead the > effect that one sometimes may notice a drop in performance when just this > socket has other jobs running (by accident). > > So, this is solved - I wasn't aware of the binding by socket. > > But I can't see a binding by core for number of processes <= 2. Does it mean > 2 per node or 2 overall for the `mpiexec`?
It’s 2 processes overall > > - -- Reuti > > >> >>> On Apr 9, 2017, at 3:40 AM, Reuti <re...@staff.uni-marburg.de> wrote: >>> >>> Hi, >>> >>> While I noticed an automatic core binding in Open MPI 1.8 (which in a >>> shared cluster may lead to oversubscribing of cores), I can't spot this any >>> longer in the 2.x series. So the question arises: >>> >>> - Was this a general decision to no longer enable automatic core binding? >>> >>> First I thought it might be because of: >>> >>> - We define plm_rsh_agent=foo in $OMPI_ROOT/etc/openmpi-mca-params.conf >>> - We compiled with --with-sge >>> >>> But also started on the command line by `ssh` to the nodes, there seems no >>> automatic core binding to take place any longer. >>> >>> -- Reuti >>> _______________________________________________ >>> users mailing list >>> users@lists.open-mpi.org >>> https://rfd.newmexicoconsortium.org/mailman/listinfo/users >> >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org <mailto:users@lists.open-mpi.org> >> https://rfd.newmexicoconsortium.org/mailman/listinfo/users >> <https://rfd.newmexicoconsortium.org/mailman/listinfo/users> >> > > -----BEGIN PGP SIGNATURE----- > Comment: GPGTools - https://gpgtools.org <https://gpgtools.org/> > > iEYEARECAAYFAljqnnYACgkQo/GbGkBRnRrwtACgpUAlpvQElzbjoVdvsQubZmTo > Pj4An05kJd3pW0YWW4HXaf/7Zl7xTc+y > =kzwG > -----END PGP SIGNATURE----- > _______________________________________________ > users mailing list > users@lists.open-mpi.org <mailto:users@lists.open-mpi.org> > https://rfd.newmexicoconsortium.org/mailman/listinfo/users > <https://rfd.newmexicoconsortium.org/mailman/listinfo/users>
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