Is this a threaded code? If so, you should add —bind-to none to your 1.8 series command line
> On Jun 12, 2015, at 7:58 AM, kishor sharma <kishor.i...@gmail.com> wrote: > > Hi There, > > > > I am facing slowness running numpy code using mpirun with openmpi 1.8.1 > version. > > > > With Open MPI (1.8.1) > > --------------------- > > > /usr/lib64/openmpi/bin/mpirun -version > > mpirun (Open MPI) 1.8.1 > > > Report bugs to http://www.open-mpi.org/community/help/ > <http://www.open-mpi.org/community/help/> > > time /usr/lib64/openmpi/bin/mpirun -np 1 python -c 'import numpy; > > numpy.linalg.svd(numpy.eye(1000))' > > real 23.75 > > user 6.95 > > sys 16.68 > > > > > > > > > With Open MPI (1.5.4): > > --------------------- > > > /usr/lib64/openmpi/bin/mpirun -version > > mpirun (Open MPI) 1.5.4 > > > Report bugs to http://www.open-mpi.org/community/help/ > <http://www.open-mpi.org/community/help/> > > time /usr/lib64/openmpi/bin/mpirun -np 1 python -c 'import numpy; > > numpy.linalg.svd(numpy.eye(1000))' > > real 1.35 > > user 2.11 > > sys 0.71 > > > > > > > Do you guys have any idea why the above function is 10-15x with openmpi > version 1.8.1 > > > > Thanks, > > Kishor > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2015/06/27123.php
