On Wed, Oct 8, 2008 at 7:09 PM, Brock Palen <bro...@umich.edu> wrote:
> Your doing this on just one node? That would be using the OpenMPI SM > transport, Last I knew it wasn't that optimized though should still be much > faster than TCP. > its on 2 nodes. I'm using TCP only. There is no infiniband hardware. > > I am surpised at your result though I do not have MPICH2 on the cluster > right now I don't have time to compare. > > How did you run the job? MPICH2: time /opt/mpich2/gnu/bin/mpirun -machinefile ./mach -np 8 /opt/apps/gromacs333/bin/mdrun_mpi | tee gro_bench_8p OpenMPI: $ time /opt/ompi127/bin/mpirun -machinefile ./mach -np 8 /opt/apps/gromacs333_ompi/bin/mdrun_mpi | tee gromacs_openmpi_8process > > > Brock Palen > www.umich.edu/~brockp <http://www.umich.edu/%7Ebrockp> > Center for Advanced Computing > bro...@umich.edu > (734)936-1985 > > > > > On Oct 8, 2008, at 9:10 AM, Sangamesh B wrote: > > Hi All, >> >> I wanted to switch from mpich2/mvapich2 to OpenMPI, as OpenMPI >> supports both ethernet and infiniband. Before doing that I tested an >> application 'GROMACS' to compare the performance of MPICH2 & OpenMPI. Both >> have been compiled with GNU compilers. >> >> After this benchmark, I came to know that OpenMPI is slower than MPICH2. >> >> This benchmark is run on a AMD dual core, dual opteron processor. Both >> have compiled with default configurations. >> >> The job is run on 2 nodes - 8 cores. >> >> OpenMPI - 25 m 39 s. >> MPICH2 - 15 m 53 s. >> >> Any comments ..? >> >> Thanks, >> Sangamesh >> _______________________________________________ >> 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 >
