/* -*- 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 prodof(int, const int[]);

/*

 * Test edge cases of Dims_create

 */

int prodof(int ndims, const int dims[])

{

    int i, prod = 1;

    for (i = 0; i < ndims; i++)

        prod *= dims[i];

    return prod;

}

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

{

    int errs = 0;

    int dims[4], nnodes;

    MTest_Init(&argc, &argv);

    /* 2 dimensional tests */

    for (nnodes = 1; nnodes <= 32; nnodes = nnodes * 2) {

        dims[0] = 0;

        dims[1] = nnodes;

        MPI_Dims_create(nnodes, 2, dims);

        if (prodof(2, dims) != nnodes) {

            errs++;

            printf("Dims_create returned the wrong decomposition.  ");

            printf("Is [%d x %d], should be 1 x %d\n", dims[0], dims[1], nnodes);

        }

        /* Try calling Dims_create with nothing to do (all dimensions

         * specified) */

        dims[0] = 1;

        dims[1] = nnodes;

        MPI_Dims_create(nnodes, 2, dims);

        if (prodof(2, dims) != nnodes) {

            errs++;

            printf("Dims_create returned the wrong decomposition (all given).  ");

            printf("Is [%d x %d], should be 1 x %d\n", dims[0], dims[1], nnodes);

        }

    }

    /* 4 dimensional tests */

    for (nnodes = 4; nnodes <= 32; nnodes = nnodes * 2) {

        dims[0] = 0;

        dims[1] = nnodes / 2;

        dims[2] = 0;

        dims[3] = 2;

        MPI_Dims_create(nnodes, 4, dims);

        if (prodof(4, dims) != nnodes) {

            errs++;

            printf("Dims_create returned the wrong decomposition.  ");

            printf("Is [%d x %d x %d x %d], should be 1 x %d x 1 x 2\n",

                   dims[0], dims[1], dims[2], dims[3], nnodes / 2);

        }

        /* Try calling Dims_create with nothing to do (all dimensions

         * specified) */

        dims[0] = 1;

        dims[1] = nnodes / 2;

        dims[2] = 1;

        dims[3] = 2;

        MPI_Dims_create(nnodes, 4, dims);

        if (prodof(4, dims) != nnodes) {

            errs++;

            printf("Dims_create returned the wrong decomposition (all given).  ");

            printf("Is [%d x %d x %d x %d], should be 1 x %d x 1 x 2\n",

                   dims[0], dims[1], dims[2], dims[3], nnodes / 2);

        }

    }

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}