Le Wednesday 28 July 2010 06:03:21 Nysal Jan, vous avez écrit : > OMPI_COMM_WORLD_RANK can be used to get the MPI rank. For other environment > variables - > http://www.open-mpi.org/faq/?category=running#mpi-environmental-variables
Are processes affected to nodes sequentially, so that I can get the NODE number from $OMPI_COMM_WORLD_RANK modulo the number of proc per node? > For processor affinity see this FAQ entry - > http://www.open-mpi.org/faq/?category=all#using-paffinity Thank you, but that's where I had the information that I put in my previous mail, so it doesn't answer to my question. .Yves. > --Nysal > > On Wed, Jul 28, 2010 at 9:04 AM, Yves Caniou <yves.can...@ens-lyon.fr>wrote: > > Hi, > > > > I have some performance issue on a parallel machine composed of nodes of > > 16 procs each. The application is launched on multiple of 16 procs for > > given numbers of nodes. > > I was told by people using MX MPI with this machine to attach a script to > > mpiexec, which 'numactl' things, in order to make the execution > > performance stable. > > > > Looking on the faq (the oldest one is for OpenMPI v1.3?), I saw that > > maybe the > > solution would be for me to use the --mca mpi_paffinity_alone 1 > > > > Is that correct? -- BTW, I have both memory and processor affinity: > > >ompi_info | grep affinity > > > > MCA paffinity: linux (MCA v2.0, API v2.0, Component v1.4.2) > > MCA maffinity: first_use (MCA v2.0, API v2.0, Component v1.4.2) > > MCA maffinity: libnuma (MCA v2.0, API v2.0, Component v1.4.2) > > Does it handle memory too, or do I have to use another option like > > --mca mpi_maffinity 1? > > > > Still, I would like to test the numactl solution. Does OpenMPI provide an > > equivalent to $MXMPI_ID which gives at least gives the NODE on which a > > process is launched by OpenMPI, so that I can adapt the script that was > > given > > to me? > > > > Tkx. > > > > .Yves. > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users -- Yves Caniou Associate Professor at Université Lyon 1, Member of the team project INRIA GRAAL in the LIP ENS-Lyon, Délégation CNRS in Japan French Laboratory of Informatics (JFLI), * in Information Technology Center, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8658, Japan tel: +81-3-5841-0540 * in National Institute of Informatics 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan tel: +81-3-4212-2412 http://graal.ens-lyon.fr/~ycaniou/
