MPI_Sendrecv (buf0, buf_size, MPI_INT, 1, 0,
buf1, buf_size, MPI_INT, 1, 0,
MPI_COMM_WORLD, &status);
}
else if (rank == 1) {
MPI_Sendrecv (buf0, buf_size, MPI_INT, 1, 0,
buf1, buf_size, MPI_INT, 1, 0,
MPI_COMM_WORLD, &status);
}
else if (rank == 1) {