> Am 10.04.2017 um 01:58 schrieb r...@open-mpi.org: > > Let me try to clarify. If you launch a job that has only 1 or 2 processes in > it (total), then we bind to core by default. This is done because a job that > small is almost always some kind of benchmark.
Yes, I see. But only if libnuma was compiled in AFAICS. > If there are more than 2 processes in the job (total), then we default to > binding to NUMA (if NUMA’s are present - otherwise, to socket) across the > entire job. Mmh - can I spot a difference in --report-bindings between these two? To me both looks like being bound to socket. -- Reuti > You can always override these behaviors. > >> On Apr 9, 2017, at 3:45 PM, Reuti <re...@staff.uni-marburg.de> wrote: >> >>>> 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 >> >> Having a round-robin allocation in the cluster, this might not be what was >> intended (to bind only one or two cores per exechost)? >> >> Obviously the default changes (from --bind-to core to --bin-to socket), >> whether I compiled Open MPI with or w/o libnuma (I wanted to get rid of the >> warning in the output only – now it works). But "--bind-to core" I could >> also use w/o libnuma and it worked, I got only that warning in addition >> about the memory couldn't be bound. >> >> BTW: I always had to use -ldl when using `mpicc`. Now, that I compiled in >> libnuma, this necessity is gone. >> >> -- Reuti >> _______________________________________________ >> users mailing list >> users@lists.open-mpi.org >> https://rfd.newmexicoconsortium.org/mailman/listinfo/users > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/users >
signature.asc
Description: Message signed with OpenPGP using GPGMail
_______________________________________________ users mailing list users@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/users
