+++ /dev/null
-/* A simple example pingpong pogram to test MPI_Send and MPI_Recv */
-
-/* Copyright (c) 2009-2010, 2012-2014. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include <stdio.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[])
-{
- const int tag1 = 42, tag2 = 43; /* Message tag */
- int rank;
- int size;
- int msg = 99;
- int err;
- int pivot;
- MPI_Status status;
-
- err = MPI_Init(&argc, &argv); /* Initialize MPI */
- if (err != MPI_SUCCESS) {
- printf("MPI initialization failed!\n");
- exit(1);
- }
- MPI_Comm_size(MPI_COMM_WORLD, &size); /* Get nr of tasks */
- MPI_Comm_rank(MPI_COMM_WORLD, &rank); /* Get id of this process */
- if (size < 2) {
- printf("run this program with exactly 2 processes (-np 2)\n");
- MPI_Finalize();
- exit(0);
- }
- if (0 == rank) {
- printf("\n *** Ping-pong test (MPI_Send/MPI_Recv) ***\n\n");
- }
-
- /* start pingpong tests between several pairs */
- for (pivot = 0; pivot < size - 1; pivot++) {
-
- if (pivot == rank) {
- printf("\n== pivot=%d : pingpong [%d] <--> [%d]\n", pivot, pivot,
- pivot + 1);
-
- int dst = rank + 1;
- printf("[%d] About to send 1st message '%d' to process [%d]\n",
- rank, msg, dst);
- MPI_Send(&msg, 1, MPI_INT, dst, tag1, MPI_COMM_WORLD);
-
- MPI_Recv(&msg, 1, MPI_INT, dst, tag2, MPI_COMM_WORLD, &status); /* Receive a message */
- printf("[%d] Received reply message '%d' from process [%d]\n", rank,
- msg, dst);
-
- }
- if ((pivot + 1) == rank) {
- int src = rank - 1;
- MPI_Recv(&msg, 1, MPI_INT, src, tag1, MPI_COMM_WORLD, &status); /* Receive a message */
- printf("[%d] Received 1st message '%d' from process [%d]\n", rank,
- msg, src);
- msg++;
- printf("[%d] increment message's value to '%d'\n", rank, msg);
- printf("[%d] About to send back message '%d' to process [%d]\n",
- rank, msg, src);
- MPI_Send(&msg, 1, MPI_INT, src, tag2, MPI_COMM_WORLD);
- }
- }
- MPI_Finalize(); /* Terminate MPI */
- return 0;
-}