Distribute the map ...
[cu01:53769] *** An error occurred in MPI_Bsend
[cu01:53769] *** reported by process [140195840131073,17]
[cu01:53769] *** on communicator MPI COMMUNICATOR 3 SPLIT FROM 0
[cu01:53769] *** MPI_ERR_BUFFER: invalid buffer pointer
[cu01:53769] *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
[cu01:53769] *** and potentially your MPI job)
