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 ..?