/* -*- 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 <stdlib.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "A simple test of Reduce with all choices of root process";

*/

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

{

    int errs = 0;

    int rank, size, root;

    int *sendbuf, *recvbuf, i;

    int minsize = 2, count;

    MPI_Comm comm;

    MTest_Init(&argc, &argv);

    while (MTestGetIntracommGeneral(&comm, minsize, 1)) {

        if (comm == MPI_COMM_NULL)

            continue;

        /* Determine the sender and receiver */

        MPI_Comm_rank(comm, &rank;;

        MPI_Comm_size(comm, &size);

        for (count = 1; count < 130000; count = count * 2) {

            sendbuf = (int *) malloc(count * sizeof(int));

            recvbuf = (int *) malloc(count * sizeof(int));

            for (root = 0; root < size; root++) {

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

                    sendbuf[i] = i;

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

                    recvbuf[i] = -1;

                MPI_Reduce(sendbuf, recvbuf, count, MPI_INT, MPI_SUM, root, comm);

                if (rank == root) {

                    for (i = 0; i < count; i++) {

                        if (recvbuf[i] != i * size) {

                            errs++;

                        }

                    }

                }

            }

            free(sendbuf);

            free(recvbuf);

        }

        MTestFreeComm(&comm);

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}