MPI on NY Blue is based on Argonne National Lab's MPICH2 . MPICH2 is an all-new implementation of MPI from the group at Argonne National Laboratory. It shares many goals with the original MPICH but no actual code. It is a portable, high-performance implementation of the MPI-2 standard.
Some functions of the MPI-2 standard that are not supported by Blue Gene/L include:
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