--- /dev/null
+/* Copyright (c) 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. */
+
+/**
+ * MESSAGE PASSING INTERFACE TEST CASE SUITE
+ *
+ * Copyright IBM Corp. 1995
+ *
+ * IBM Corp. hereby grants a non-exclusive license to use, copy, modify, and
+ *distribute this software for any purpose and without fee provided that the
+ *above copyright notice and the following paragraphs appear in all copies.
+
+ * IBM Corp. makes no representation that the test cases comprising this
+ * suite are correct or are an accurate representation of any standard.
+
+ * In no event shall IBM be liable to any party for direct, indirect, special
+ * incidental, or consequential damage arising out of the use of this software
+ * even if IBM Corp. has been advised of the possibility of such damage.
+
+ * IBM CORP. SPECIFICALLY DISCLAIMS ANY WARRANTIES INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS AND IBM
+ * CORP. HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
+ * ENHANCEMENTS, OR MODIFICATIONS.
+ **/
+#include <stdio.h>
+#include <mpi.h>
+
+static int ibm_test(int rank, int size)
+{
+
+#define MAXLEN 10000
+
+ int success = 1;
+ int root = 0;
+ int i, j, k;
+ int *out;
+ int *in;
+
+ out = malloc(MAXLEN * 64 * sizeof(int));
+ in = malloc(MAXLEN * sizeof(int));
+
+ for (j = 1; j <= MAXLEN; j *= 10) {
+ root = (root + 1) % size;
+ if (rank == root)
+ for (i = 0; i < j * size; i++)
+ out[i] = i;
+
+ MPI_Scatter(out, j, MPI_INT, in, j, MPI_INT, root, MPI_COMM_WORLD);
+
+ for (k = 0; k < j; k++) {
+ if (in[k] != k + rank * j) {
+ fprintf(stderr, "task %d bad answer (%d) at index %d k of %d (should be %d)",rank, in[k], k, j, (k + rank * j));
+ return (0);
+ }
+ }
+ }
+ free(out);
+ free(in);
+ MPI_Barrier(MPI_COMM_WORLD);
+ return (success);
+}
+
+/** small test: the root sends a single distinct double to other processes */
+static int small_test(int rank, int size)
+{
+ int success = 1;
+ int retval;
+ int sendcount = 1; // one double to each process
+ int recvcount = 1;
+ int i;
+ double *sndbuf = NULL;
+ double rcvd;
+ int root = 0; // arbitrary choice
+
+ // on root, initialize sendbuf
+ if (root == rank) {
+ sndbuf = malloc(size * sizeof(double));
+ for (i = 0; i < size; i++) {
+ sndbuf[i] = (double) i;
+ }
+ }
+
+ retval = MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, recvcount, MPI_DOUBLE, root, MPI_COMM_WORLD);
+ if (root == rank) {
+ free(sndbuf);
+ }
+ if (retval != MPI_SUCCESS) {
+ fprintf(stderr, "(%s:%d) MPI_Scatter() returned retval=%d\n", __FILE__, __LINE__, retval);
+ return 0;
+ }
+ // verification
+ if ((double) rank != rcvd) {
+ fprintf(stderr, "[%d] has %f instead of %d\n", rank, rcvd, rank);
+ success = 0;
+ }
+ return (success);
+}
+
+int main(int argc, char **argv)
+{
+ int size, rank;
+
+ MPI_Init(&argc, &argv);
+ MPI_Comm_size(MPI_COMM_WORLD, &size);
+ MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+
+ /* test 1 */
+ if (0 == rank)
+ printf("** Small Test Result: ...\n");
+ if (!small_test(rank, size))
+ printf("\t[%d] failed.\n", rank);
+ else
+ printf("\t[%d] ok.\n", rank);
+
+ MPI_Barrier(MPI_COMM_WORLD);
+
+ /* test 2 */
+ if (0 == rank)
+ printf("** IBM Test Result: ...\n");
+ if (!ibm_test(rank, size))
+ printf("\t[%d] failed.\n", rank);
+ else
+ printf("\t[%d] ok.\n", rank);
+
+ MPI_Finalize();
+ return 0;
+}
