/* set up the sends */
MPI_Isend (small_struct_buf, 1, newtype[0], 1, 0, comm, &aReq[0]);
MPI_Isend (big_struct_buf, 1, newtype[1], 1, 1, comm, &aReq[1]);
/* set up the sends */
MPI_Isend (small_struct_buf, 1, newtype[0], 1, 0, comm, &aReq[0]);
MPI_Isend (big_struct_buf, 1, newtype[1], 1, 1, comm, &aReq[1]);