Does your application do a lot of printing to stdout/stderr? On Jan 11, 2010, at 8:00 AM, Mathieu Gontier wrote:
> Hi all > > I want to migrate my CFD application from MPICH-1.2.4 (ch_p4 device) to > OpenMPI-1.4. Hence, I compared the two libraries compiled with my application > and I noted OpenMPI is less efficient thant MPICH on ethernet (170min with > MPICH against 200min with OpenMPI). So, I wonder if someone has more > information/explanation. > > Here the configure options of OpenMPI: > > export FC=gfortran > export F77=$FC > export CC=gcc > export PREFIX=/usr/local/bin/openmpi-1.4 > ./configure --prefix=$PREFIX --enable-cxx-exceptions --enable-mpi-f77 > --enable-mpi-f90 --enable-mpi-cxx --enable-mpi-cxx-seek --enable-dist > --enable-mpi-profile --enable-binaries --enable-cxx-exceptions > --enable-mpi-threads --enable-memchecker --with-pic --with-threads > --with-valgrind --with-libnuma --with-openib > > Despite my OpenMPI compilation supports OpenIB, I did not specified any > mca/btl options because the machine does not have access to a Infiniband > interconnect. So, I guess tcp, sm and self are used (or at least something > close). > > Thank you for your help. > Mathieu. > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
