2 /* Creator: Jeffrey Vetter (j-vetter@llnl.gov) Mon Nov 1 1999 */
3 /* lost-request.c -- overwrite a request and essentially lose a synch point */
7 "$Header: /usr/gapps/asde/cvs-vault/umpire/tests/lost-request.c,v 1.3 2003/01/13 18:31:48 bronis Exp $";
17 mydelay () /* about 6 seconds */
21 for (i = 0; i < 3000000; i++)
23 val = getpid (); /* about 2.06 usecs on snow */
29 main (int argc, char **argv)
35 char processor_name[128];
39 MPI_Request req, req0, req1;
40 MPI_Status status, status0, status1;
43 MPI_Init (&argc, &argv);
44 MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
45 MPI_Comm_rank (MPI_COMM_WORLD, &rank);
46 MPI_Get_processor_name (processor_name, &namelen);
47 printf ("(%d) is alive on %s\n", rank, processor_name);
50 memset (buf0, 1, buf_size*sizeof(int));
51 memset (buf1, 2, buf_size*sizeof(int));
53 MPI_Barrier(MPI_COMM_WORLD);
55 /* 0 sends 1 two messages, but the request gets overwritten */
59 MPI_Isend (buf0, buf_size, MPI_INT, 1, tag1, MPI_COMM_WORLD, &req0);
60 MPI_Isend (buf1, buf_size, MPI_INT, 1, tag2, MPI_COMM_WORLD, &req1);
62 /* do some work here */
65 MPI_Wait (&req0, &status0);
66 MPI_Wait (&req1, &status1);
70 MPI_Irecv (buf0, buf_size, MPI_INT, 0, tag1, MPI_COMM_WORLD, &req);
71 MPI_Irecv (buf1, buf_size, MPI_INT, 0, tag2, MPI_COMM_WORLD, &req); /* overwrite req */
73 /* do some work here and get confused */
75 MPI_Wait (&req, &status);
84 printf ("(%d) Finished normally\n", rank);