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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpitest.h"
#include <stdio.h>
#include <assert.h>
/* This test tests MPI_Intercomm_create_from_groups */
int main(int argc, char *argv[])
{
int errs = 0;
int ret;
MPI_Session session;
MPI_Group world_group;
MPI_Comm comm;
MPI_Session_init(MPI_INFO_NULL, MPI_ERRORS_ARE_FATAL, &session);
MPI_Group_from_session_pset(session, "mpi://world", &world_group);
int world_rank, world_size;
MPI_Group_rank(world_group, &world_rank);
MPI_Group_size(world_group, &world_size);
if (world_size == 1) {
printf("The test require more than 1 process.\n");
goto fn_exit;
}
int *proc_list;
int local_leader, remote_leader;
proc_list = malloc(world_size * sizeof(int));
for (int i = 0; i < world_size; i++) {
proc_list[i] = i;
}
int n1 = world_size / 2;
int n2 = world_size - n1;
MPI_Group local_group, remote_group;
if (world_rank < n1) {
MPI_Group_incl(world_group, n1, proc_list, &local_group);
MPI_Group_incl(world_group, n2, proc_list + n1, &remote_group);
} else {
MPI_Group_incl(world_group, n1, proc_list, &remote_group);
MPI_Group_incl(world_group, n2, proc_list + n1, &local_group);
}
free(proc_list);
MPI_Comm inter_comm;
MPI_Intercomm_create_from_groups(local_group, 0, remote_group, 0, "string tag",
MPI_INFO_NULL, MPI_ERRORS_ARE_FATAL, &inter_comm);
errs = MTestTestIntercomm(inter_comm);
MPI_Group_free(&world_group);
MPI_Group_free(&local_group);
MPI_Group_free(&remote_group);
MPI_Comm_free(&inter_comm);
MPI_Session_finalize(&session);
if (world_rank == 0 && errs == 0) {
printf("No Errors\n");
}
fn_exit:
return errs;
}
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