/* -*- 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);
    MPI_Finalize();
    return 0;

}
