Restructure teshsuite smpi

[simgrid.git] / teshsuite / smpi / pingpong / pingpong.c

diff --git a/teshsuite/smpi/pingpong/pingpong.c b/teshsuite/smpi/pingpong/pingpong.c
new file mode 100644 (file)
index 0000000..ab3f440
--- /dev/null
+++ b/teshsuite/smpi/pingpong/pingpong.c
@@ -0,0 +1,69 @@
+/* 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);
+  }
+  err = MPI_Comm_size(MPI_COMM_WORLD, &size);   /* Get nr of tasks */
+  err = 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);
+      err = MPI_Send(&msg, 1, MPI_INT, dst, tag1, MPI_COMM_WORLD);
+
+      err = 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;
+      err = 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);
+      err = MPI_Send(&msg, 1, MPI_INT, src, tag2, MPI_COMM_WORLD);
+    }
+  }
+  err = MPI_Finalize();         /* Terminate MPI */
+  return 0;
+}