-/* 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 <stdlib.h>
-#include <sys/time.h>
-#include <mpi.h>
-
-int main(int argc, char *argv[])
-{
- int rank;
- int size;
- MPI_Status status;
-
- int n = 0, m = 0, bytes = 0, workusecs = 0;
- int currusecs;
-
- char *buf = NULL;
- int i, j;
- struct timeval start_time, stop_time;
- struct timeval start_pause, curr_pause;
- unsigned long usecs;
-
- MPI_Init(&argc, &argv); /* Initialize MPI */
- 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) {
- if (argc > 1 && isdigit(argv[1][0])) {
- n = atoi(argv[1]);
- }
- if (argc > 2 && isdigit(argv[2][0])) {
- m = atoi(argv[2]);
- }
- if (argc > 3 && isdigit(argv[3][0])) {
- bytes = atoi(argv[3]);
- }
- if (argc > 4 && isdigit(argv[4][0])) {
- workusecs = atoi(argv[4]);
- }
- buf = malloc(sizeof(char) * bytes);
- for (i = 0; i < bytes; i++) buf[i] = i % 256;
- MPI_Send(&n, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
- MPI_Send(&m, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
- MPI_Send(&bytes, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
- MPI_Send(&workusecs, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
- MPI_Barrier(MPI_COMM_WORLD);
- gettimeofday(&start_time, NULL);
- for (i = 0; i < n; i++) {
- for (j = 0; j < m; j++) {
- MPI_Send(buf, bytes, MPI_CHAR, 1, 0, MPI_COMM_WORLD);
- gettimeofday(&start_pause, NULL);
- currusecs = 0;
- while (currusecs < workusecs) {
- gettimeofday(&curr_pause, NULL);
- currusecs = (curr_pause.tv_sec - start_pause.tv_sec) * 1e6 + curr_pause.tv_usec - start_pause.tv_usec;
- }
- }
- MPI_Recv(buf, bytes, MPI_CHAR, 1, 0, MPI_COMM_WORLD, &status);
- }
- gettimeofday(&stop_time, NULL);
- usecs = (stop_time.tv_sec - start_time.tv_sec) * 1e6 + stop_time.tv_usec - start_time.tv_usec;
- printf("n: %d m: %d bytes: %d sleep: %d usecs: %u\n", n, m, bytes, workusecs, usecs);
- } else {
- MPI_Recv(&n, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, &status);
- MPI_Recv(&m, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, &status);
- MPI_Recv(&bytes, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, &status);
- MPI_Recv(&workusecs, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, &status);
- buf = malloc(sizeof(char) * bytes);
- MPI_Barrier(MPI_COMM_WORLD);
- for (i = 0; i < n; i++) {
- for (j = 0; j < m; j++) {
- MPI_Recv(buf, bytes, MPI_CHAR, 0, 0, MPI_COMM_WORLD, &status);
- }
- MPI_Send(buf, bytes, MPI_CHAR, 0, 0, MPI_COMM_WORLD);
- }
- }
- free(buf);
- MPI_Finalize();
- return 0;
-}
