2 /* Creator: Bronis R. de Supinski (bronis@llnl.gov) Fri Mar 17 2000 */
3 /* no-error.c -- do some MPI calls without any errors */
11 main (int argc, char **argv)
15 char processor_name[128];
24 MPI_Init (&argc, &argv);
25 MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
26 MPI_Comm_rank (MPI_COMM_WORLD, &rank);
27 MPI_Get_processor_name (processor_name, &namelen);
28 printf ("(%d) is alive on %s\n", rank, processor_name);
31 MPI_Barrier (MPI_COMM_WORLD);
34 printf ("not enough tasks\n");
37 MPI_Comm_split (MPI_COMM_WORLD, rank % 2, nprocs - rank, &comm);
39 if (comm != MPI_COMM_NULL) {
40 MPI_Comm_size (comm, &dnprocs);
41 MPI_Comm_rank (comm, &drank);
45 memset (buf0, 0, buf_size);
47 MPI_Recv (buf1, buf_size, MPI_INT, 1, 0, comm, &status);
49 MPI_Send (buf0, buf_size, MPI_INT, 1, 0, comm);
51 else if (drank == 1) {
52 memset (buf1, 1, buf_size);
54 MPI_Recv (buf0, buf_size, MPI_INT, 0, 0, comm, &status);
56 MPI_Send (buf1, buf_size, MPI_INT, 0, 0, comm);
60 printf ("(%d) Derived communicator too small (size = %d)\n",
64 MPI_Comm_free (&comm);
67 printf ("(%d) Got MPI_COMM_NULL\n", rank);
71 MPI_Barrier (MPI_COMM_WORLD);
74 printf ("(%d) Finished normally\n", rank);