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MPI implementation
•needed to replace the MPI calls used by Diffpack
•a subset of the MPI standard:
•MPI_Init, MPI_Finalize
•MPI_Comm_size, MPI_Comm_rank
•MPI_Send, MPI_Recv
•MPI_Isend, MPI_Irecv
•MPI_Bcast, MPI_Wait
•MPI_Reduce, MPI_Allreduce
•MPI_Barrier
•MPI_Wtime