/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include "mpitest.h"

int main(int argc, char *argv[])

{

    int errs = 0;

    int size, rank;

    int dims[2], periods[2];

    MPI_Comm comm;

    MTest_Init(&argc, &argv);

    /* Create a new cartesian communicator in a subset of the processes */

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    if (size < 2) {

        fprintf(stderr, "This test needs at least 2 processes\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    dims[0] = size - 1;

    periods[0] = 1;

    MPI_Cart_create(MPI_COMM_WORLD, 1, dims, periods, 0, &comm);

    if (comm != MPI_COMM_NULL) {

        int csize;

        MPI_Comm_size(comm, &csize);

        if (csize != dims[0]) {

            errs++;

            fprintf(stderr,

                    "Sizes is wrong in cart communicator.  Is %d, should be %d\n", csize, dims[0]);

        }

        MPI_Barrier(comm);

        MPI_Comm_free(&comm);

    }

    else if (rank < dims[0]) {

        errs++;

        fprintf(stderr, "Communicator returned is null!");

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}