MPI_Barrier
MPI_Bcast
MPI_Gather MPI_Gatherv MPI_Allgather MPI_Allgatherv MPI_Scatter MPI_Scatterv MPI_Alltoall MPI_Alltoallv
MPI_Reduce MPI_Allreduce MPI_Reduce_scatter MPI_Scan MPI_Op_create MPI_Op_free