1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
3 * (C) 2015 by Argonne National Laboratory.
4 * See COPYRIGHT in top-level directory.
7 #include "mpitestconf.h"
13 int main(int argc, char *argv[])
16 MPI_Group world_group;
17 MPI_Comm group_comm, idup_comm;
19 MPI_Init(&argc, &argv);
21 MPI_Comm_size(MPI_COMM_WORLD, &size);
22 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
25 fprintf(stderr, "this program requires even number of processes\n");
26 MPI_Abort(MPI_COMM_WORLD, 1);
29 /* Create some groups */
30 MPI_Comm_group(MPI_COMM_WORLD, &world_group);
33 MPI_Comm_create_group(MPI_COMM_WORLD, world_group, 0, &group_comm);
34 MPI_Comm_idup(MPI_COMM_WORLD, &idup_comm, &req);
37 MPI_Comm_idup(MPI_COMM_WORLD, &idup_comm, &req);
38 MPI_Comm_create_group(MPI_COMM_WORLD, world_group, 0, &group_comm);
41 MPI_Wait(&req, MPI_STATUSES_IGNORE);
42 /*Test new comm with a barrier */
43 MPI_Barrier(idup_comm);
44 MPI_Barrier(group_comm);
46 MPI_Group_free(&world_group);
47 MPI_Comm_free(&idup_comm);
48 MPI_Comm_free(&group_comm);
50 printf(" No errors\n");