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