-/* -*- Mode: C; -*- */
-/* Creator: Bronis R. de Supinski (bronis@llnl.gov) Fri Mar 17 2000 */
-/* no-error.c -- do some MPI calls without any errors */
-
-#include <stdio.h>
-#include "mpi.h"
-
-#define buf_size 128
-
-int
-main (int argc, char **argv)
-{
- int nprocs = -1;
- int rank = -1;
- char processor_name[128];
- int namelen = 128;
- int buf0[buf_size];
- int buf1[buf_size];
- MPI_Status status;
- MPI_Request req1;
- MPI_Request req2;
-
- /* init */
- MPI_Init (&argc, &argv);
- MPI_Comm_size (MPI_COMM_WORLD, &nprocs);
- MPI_Comm_rank (MPI_COMM_WORLD, &rank);
- MPI_Get_processor_name (processor_name, &namelen);
- printf ("(%d) is alive on %s\n", rank, processor_name);
- fflush (stdout);
-
- MPI_Barrier (MPI_COMM_WORLD);
-
- if (nprocs < 2)
- {
- printf ("not enough tasks\n");
- }
- else
- {
- int dest = (rank == nprocs - 1) ? (0) : (rank + 1);
- int src = (rank == 0) ? (nprocs - 1) : (rank - 1);
- memset (buf0, rank, buf_size);
- memset (buf1, rank, buf_size);
- MPI_Irecv (buf0, buf_size, MPI_INT, src, 0, MPI_COMM_WORLD, &req1);
- MPI_Isend (buf1, buf_size, MPI_INT, dest, 0, MPI_COMM_WORLD, &req2);
- MPI_Wait(&req2,&status);
- MPI_Wait(&req1,&status);
- }
-
- MPI_Barrier (MPI_COMM_WORLD);
- MPI_Finalize ();
- printf ("(%d) Finished normally\n", rank);
-}
-
-/* EOF */