1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
3 * (C) 2003 by Argonne National Laboratory.
4 * See COPYRIGHT in top-level directory.
13 static char MTEST_Descrip[] = "Test MPI_Allreduce with count greater than the number of processes";
16 /* We make the error count global so that we can easily control the output
17 of error information (in particular, limiting it after the first 10
21 int main(int argc, char *argv[])
25 int count, *bufin, *bufout, size, i, minsize = 1;
27 MTest_Init(&argc, &argv);
29 while (MTestGetIntracommGeneral(&comm, minsize, 1)) {
30 if (comm == MPI_COMM_NULL) {
33 MPI_Comm_size(comm, &size);
35 bufin = (int *) malloc(count * sizeof(int));
36 bufout = (int *) malloc(count * sizeof(int));
37 if (!bufin || !bufout) {
38 fprintf(stderr, "Unable to allocated space for buffers (%d)\n", count);
39 MPI_Abort(MPI_COMM_WORLD, 1);
41 for (i = 0; i < count; i++) {
47 MPI_Allreduce(bufin, bufout, count, dtype, MPI_SUM, comm);
49 for (i = 0; i < count; i++) {
50 if (bufout[i] != i * size) {
51 fprintf(stderr, "Expected bufout[%d] = %d but found %d\n", i, i * size, bufout[i]);