1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
4 * (C) 2003 by Argonne National Laboratory.
5 * See COPYRIGHT in top-level directory.
11 #include "mpicolltest.h"
14 static char MTEST_Descrip[] = "Simple intercomm reduce test";
17 int main(int argc, char *argv[])
20 int *sendbuf = 0, *recvbuf = 0;
21 int leftGroup, i, count, rank, rsize;
23 MPI_Datatype datatype;
25 MTest_Init(&argc, &argv);
28 /* Get an intercommunicator */
29 while (MTestGetIntercomm(&comm, &leftGroup, 4)) {
30 if (comm == MPI_COMM_NULL)
33 MPI_Comm_rank(comm, &rank);
34 MPI_Comm_remote_size(comm, &rsize);
36 /* To improve reporting of problems about operations, we
37 * change the error handler to errors return */
38 MPI_Comm_set_errhandler(comm, MPI_ERRORS_RETURN);
40 for (count = 1; count < 65000; count = 2 * count) {
41 sendbuf = (int *) malloc(count * sizeof(int));
42 recvbuf = (int *) malloc(count * sizeof(int));
43 for (i = 0; i < count; i++) {
48 err = MTest_Reduce(sendbuf, recvbuf, count, datatype, MPI_SUM,
49 (rank == 0) ? MPI_ROOT : MPI_PROC_NULL, comm);
54 /* Test that no other process in this group received the
55 * broadcast, and that we got the right answers */
57 for (i = 0; i < count; i++) {
58 if (recvbuf[i] != i * rsize) {
64 for (i = 0; i < count; i++) {
65 if (recvbuf[i] != -1) {
72 /* In the right group */
73 for (i = 0; i < count; i++)
75 err = MTest_Reduce(sendbuf, recvbuf, count, datatype, MPI_SUM, 0, comm);
80 /* Check that we have received no data */
81 for (i = 0; i < count; i++) {
82 if (recvbuf[i] != -1) {