+/* 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 "mpi.h"
#include <stdio.h>
-
-int main(int argc, char *argv[])
+
+static int test(int myid, int numprocs)
{
-#define TAG_RCV 998
+// The tags should match on the sender and receiver side.
+// The distinction between sendtag and recvtag is mainly
+// useful to make some other Recv or Send calls match the sendrecv.
+#define TAG_RCV 999
#define TAG_SND 999
- int myid, numprocs, left, right;
- int buffer[10], buffer2[10];
- MPI_Request request;
- MPI_Status status;
-
- MPI_Init(&argc,&argv);
- MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
- MPI_Comm_rank(MPI_COMM_WORLD, &myid);
-
- right = (myid + 1) % numprocs;
- left = myid - 1;
- if (left < 0)
- left = numprocs - 1;
-
- MPI_Sendrecv(buffer, 10, MPI_INT, left, TAG_SND, buffer2, 10, MPI_INT, right, TAG_RCV, MPI_COMM_WORLD, &status);
-
- MPI_Finalize();
- return 0;
+
+
+#define BUFLEN 10
+ int left, right;
+ int buffer[BUFLEN], buffer2[BUFLEN];
+ int i;
+ MPI_Status status;
+
+ for (i = 0; i < BUFLEN; i++) {
+ buffer[i] = myid;
+ }
+
+ right = (myid + 1) % numprocs;
+ left = myid - 1;
+ if (left < 0)
+ left = numprocs - 1;
+
+ /* performs a right-to-left shift of vectors */
+ MPI_Sendrecv(buffer, 10, MPI_INT, left, TAG_SND, buffer2, 10, MPI_INT,
+ right, TAG_RCV, MPI_COMM_WORLD, &status);
+
+ for (i = 0; i < BUFLEN; i++) {
+ if (buffer2[i] != right) {
+ fprintf(stderr, "[%d] error: should have values %d, has %d\n", myid,
+ right, buffer2[i]);
+ return (0);
+ }
+ }
+ return (1);
+}
+
+int main(int argc, char *argv[])
+{
+
+ int myid, numprocs;
+
+ MPI_Init(&argc, &argv);
+ MPI_Comm_size(MPI_COMM_WORLD, &numprocs);
+ MPI_Comm_rank(MPI_COMM_WORLD, &myid);
+
+
+ if (0 == myid)
+ printf("\n *** MPI_Sendrecv test ***\n\n");
+
+ if (test(myid, numprocs)) {
+ fprintf(stderr, "[%d] ok.\n", myid);
+ } else {
+ fprintf(stderr, "[%d] failed.\n", myid);
+ }
+
+
+ MPI_Finalize();
+ return 0;
}
