+++ /dev/null
-/* -*- 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
-
-#define INTERCOMM_CREATE_TAG 666
-
-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_Comm temp, intercomm;
- int trank, tnprocs;
- int drank, dnprocs, rleader, rnprocs;
-
- /* 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 < 4) {
- printf ("not enough tasks\n");
- }
- else {
- /* need to make split communicator temporarily... */
- MPI_Comm_split (MPI_COMM_WORLD, rank % 2, nprocs - rank, &temp);
-
- if (temp != MPI_COMM_NULL) {
- MPI_Comm_size (temp, &tnprocs);
- MPI_Comm_rank (temp, &trank);
-
- /* create an intercommunicator temporarily so can merge it... */
- rleader = ((rank + nprocs) % 2) ? nprocs - 2 : nprocs - 1;
-
- if (rank == 1) {
- MPI_Recv (buf0, buf_size, MPI_INT, 0, 0, MPI_COMM_WORLD, &status);
- }
-
- MPI_Intercomm_create (temp, 0, MPI_COMM_WORLD, rleader,
- INTERCOMM_CREATE_TAG, &intercomm);
-
- if (rank == 0) {
- memset (buf0, 0, buf_size*sizeof(int));
-
- MPI_Send (buf0, buf_size, MPI_INT, 1, 0, MPI_COMM_WORLD);
- }
-
- MPI_Comm_free (&temp);
-
- if (intercomm != MPI_COMM_NULL) {
- MPI_Comm_size (intercomm, &dnprocs);
- MPI_Comm_rank (intercomm, &drank);
- MPI_Comm_remote_size (intercomm, &rnprocs);
-
- if (rnprocs > drank) {
- if (rank % 2) {
- memset (buf1, 1, buf_size*sizeof(int));
-
- MPI_Recv (buf0, buf_size, MPI_INT, drank, 0, intercomm, &status);
-
- MPI_Send (buf1, buf_size, MPI_INT, drank, 0, intercomm);
- }
- else {
- memset (buf0, 0, buf_size*sizeof(int));
-
- MPI_Send (buf0, buf_size, MPI_INT, drank, 0, intercomm);
-
- MPI_Recv (buf1, buf_size, MPI_INT, drank, 0, intercomm, &status);
- }
- }
- else {
- printf ("(%d) Intercomm too small (lrank = %d; remote size = %d)\n",
- rank, drank, rnprocs);
- }
-
- MPI_Comm_free (&intercomm);
- }
- else {
- printf ("(%d) Got MPI_COMM_NULL\n", rank);
- }
- }
- else {
- printf ("(%d) MPI_Comm_split got MPI_COMM_NULL\n", rank);
- }
- }
-
- MPI_Barrier (MPI_COMM_WORLD);
-
- MPI_Finalize ();
- printf ("(%d) Finished normally\n", rank);
-}
-
-/* EOF */