2 /* Creator: Bronis R. de Supinski (bronis@llnl.gov) Thu Nov 30 2000 */
3 /* persistent2.c -- do some persistent MPI calls including activating */
4 /* a request twice - the effect of which is undefined - usually an error */
12 main (int argc, char **argv)
16 char processor_name[128];
21 MPI_Status aStatus[2];
26 MPI_Init (&argc, &argv);
27 MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
28 MPI_Comm_rank (MPI_COMM_WORLD, &rank);
29 MPI_Get_processor_name (processor_name, &namelen);
30 printf ("(%d) is alive on %s\n", rank, processor_name);
33 MPI_Barrier (MPI_COMM_WORLD);
36 printf ("not enough tasks\n");
40 memset (buf0, 0, buf_size);
42 MPI_Send_init (buf0, buf_size, MPI_INT, 1, 0, MPI_COMM_WORLD, &aReq[0]);
43 MPI_Recv_init (buf1, buf_size, MPI_INT, 1, 0, MPI_COMM_WORLD, &aReq[1]);
48 MPI_Waitall (2, aReq, aStatus);
50 memset (buf0, 1, buf_size);
52 MPI_Startall (2, aReq);
54 memset (buf0, 0, buf_size);
56 /* activate a request twice */
59 MPI_Waitall (2, aReq, aStatus);
62 memset (buf1, 1, buf_size);
64 MPI_Recv_init (buf0, buf_size, MPI_INT, 0, 0, MPI_COMM_WORLD, &aReq[0]);
65 MPI_Send_init (buf1, buf_size, MPI_INT, 0, 0, MPI_COMM_WORLD, &aReq[1]);
70 MPI_Waitall (2, aReq, aStatus);
72 memset (buf1, 0, buf_size);
74 MPI_Startall (2, aReq);
76 /* activate a request twice */
79 MPI_Waitall (2, aReq, aStatus);
83 MPI_Barrier (MPI_COMM_WORLD);
85 MPI_Request_free (&aReq[0]);
88 printf ("(%d) Finished normally\n", rank);