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];
19 MPI_Status statuses[2];
23 MPI_Init (&argc, &argv);
24 MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
25 MPI_Comm_rank (MPI_COMM_WORLD, &rank);
26 MPI_Get_processor_name (processor_name, &namelen);
27 printf ("(%d) is alive on %s\n", rank, processor_name);
30 MPI_Barrier (MPI_COMM_WORLD);
32 /* the following code is "correct although its result */
33 /* is non-deterministic - in task 0, either buf0 will */
34 /* hold result of memset to 0 and buf1 will hold result */
35 /* of memset to 1 or buf0 will hold result of memset to */
36 /* 1 and buf1 will hold result of memset to 0; in task 1, */
37 /* buf1 will mirror task 0 buf1 result while, in task 2, */
38 /* buf0 will mirror task 0 buf0 result; thus buf0 may */
39 /* be equal to buf1 in tasks 1 and 2 or it may not... */
42 printf ("not enough tasks\n");
46 MPI_Irecv (buf0, buf_size, MPI_INT,
47 MPI_ANY_SOURCE, 0, MPI_COMM_WORLD, &reqs[0]);
49 MPI_Irecv (buf1, buf_size, MPI_INT,
50 MPI_ANY_SOURCE, 0, MPI_COMM_WORLD, &reqs[1]);
52 MPI_Waitall (2, reqs, statuses);
54 MPI_Send (buf1, buf_size, MPI_INT, 1, 1, MPI_COMM_WORLD);
56 MPI_Send (buf0, buf_size, MPI_INT, 2, 2, MPI_COMM_WORLD);
60 memset (buf0, 0, buf_size);
62 MPI_Send (buf0, buf_size, MPI_INT, 0, 0, MPI_COMM_WORLD);
64 MPI_Recv (buf1, buf_size, MPI_INT, 0, 1, MPI_COMM_WORLD, statuses);
68 memset (buf1, 1, buf_size);
70 MPI_Send (buf1, buf_size, MPI_INT, 0, 0, MPI_COMM_WORLD);
72 MPI_Recv (buf0, buf_size, MPI_INT, 0, 2, MPI_COMM_WORLD, statuses);
75 MPI_Barrier (MPI_COMM_WORLD);
78 printf ("(%d) Finished normally\n", rank);