+#include <stdio.h>
+#include <mpi.h>
+
+/**
+ * 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.
+ * ***************************************************************************
+ **/
+int ibm_test(int rank, int size)
+{
+ int success = 1;
+#define MAXLEN 10000
+
+ int root, i, j, k;
+ int out[MAXLEN];
+ int in[MAXLEN];
+
+ for (j = 1; j <= MAXLEN; j *= 10) {
+ for (i = 0; i < j; i++)
+ out[i] = i;
+
+ MPI_Allreduce(out, in, j, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
+ MPI_Barrier(MPI_COMM_WORLD);
+
+ if (rank == root) {
+ for (k = 0; k < j; k++) {
+ if (in[k] != k * size) {
+ printf("bad answer (%d) at index %d of %d (should be %d)", in[k], k,
+ j, k * size);
+ success = 0;
+ break;
+ }
+ }
+ }
+ }
+ 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);
+
+
+ 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;
+}
