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MVAPICH2 is an implementation of MPI developed at Ohio State University for high-performance interconnects such as InfiniBand. It aims to compliance with MPI-3 standard.
The MVAPICH2 package is distributed under BSD License.
On Grex, MVAPICH2 is available using environment modules. It is not the default MPI (which is OpenMPI) so it is recommended to issue "module purge" command before loading MVAPICH modules. Note that for GCC compilers, there are several builds of MVAPICH2, and it is necessary to load the desired version of GCC (4.6, 4.7) first so that the MVAPICH2 module would detect it.