From 1b799ef312f2e3408dbd24407438a541ceae5eb6 Mon Sep 17 00:00:00 2001
From: Mark Stillwell <marklee@fortawesome.org>
Date: Mon, 26 Dec 2011 12:36:22 +0100
Subject: [PATCH] send test program

---
 examples/smpi/sendtest.c | 92 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 examples/smpi/sendtest.c

diff --git a/examples/smpi/sendtest.c b/examples/smpi/sendtest.c
new file mode 100644
index 0000000000..66fe0b7c2e
--- /dev/null
+++ b/examples/smpi/sendtest.c
@@ -0,0 +1,92 @@
+/* A simple example pingpong pogram to test MPI_Send and MPI_Recv */
+
+/* Copyright (c) 2009, 2010. 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;
+}
-- 
2.20.1