I'm way behind on updating the FAQs -my apologies :-(
Sent from my iPhone On Nov 8, 2012, at 9:31 AM, "Blosch, Edwin L" <edwin.l.blo...@lmco.com> wrote: > Thanks, that’s what I’m looking for. > > My first look for documentation is always the FAQ, not the man pages. I > found no mention of -npersocket in the FAQ but there it is very clear in the > man page. Boy do I feel dumb. > > Anyway, thanks a lot. > > From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On > Behalf Of Ralph Castain > Sent: Thursday, November 08, 2012 10:08 AM > To: Open MPI Users > Subject: Re: [OMPI users] EXTERNAL: Re: Best way to map MPI processes to > sockets? > > I gather from your other emails you are using 1.4.3, yes? I believe that has > npersocket as an option. If so, you could do: > > mpirun -npersocket 2 -bind-to-socket ... > > That would put two processes in each socket, bind them to that socket, and > rank them in series. So ranks 0-1 would be bound to the first socket, ranks > 2-3 to the second. > > Ralph > > > > On Thu, Nov 8, 2012 at 6:52 AM, Blosch, Edwin L <edwin.l.blo...@lmco.com> > wrote: > Yes it is a Westmere system. > > Socket L#0 (P#0 CPUModel="Intel(R) Xeon(R) CPU E7- 8870 @ 2.40GHz" > CPUType=x86_64) > L3Cache L#0 (size=30720KB linesize=64 ways=24) > L2Cache L#0 (size=256KB linesize=64 ways=8) > L1dCache L#0 (size=32KB linesize=64 ways=8) > L1iCache L#0 (size=32KB linesize=64 ways=4) > Core L#0 (P#0) > PU L#0 (P#0) > L2Cache L#1 (size=256KB linesize=64 ways=8) > L1dCache L#1 (size=32KB linesize=64 ways=8) > L1iCache L#1 (size=32KB linesize=64 ways=4) > Core L#1 (P#1) > PU L#1 (P#1) > > So I guess each core has its own L1 and L2 caches. Maybe I shouldn't care > where or if the MPI processes are bound within a socket; if I can test it, > that will be good enough for me. > > So my initial question is now changed to: > > What is the best/easiest way to get this mapping? Rankfile?, --cpus-per-proc > 2 --bind-to-socket, or something else? > > RANK SOCKET CORE > 0 0 unspecified > 1 0 unspecified > 2 1 unspecified > 3 1 unspecified > > > Thanks > > -----Original Message----- > From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On > Behalf Of Brice Goglin > Sent: Wednesday, November 07, 2012 6:17 PM > To: us...@open-mpi.org > Subject: EXTERNAL: Re: [OMPI users] Best way to map MPI processes to sockets? > > What processor and kernel is this? (see /proc/cpuinfo, or run "lstopo -v" and > look for attributes on the Socket line) You're hwloc output looks like an > Intel Xeon Westmere-EX (E7-48xx or E7-88xx). > The likwid output is likely wrong (maybe confused by the fact that hardware > threads are disabled). > > Brice > > > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
