/* -*- 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"

#include "mpicolltest.h"

/*

static char MTEST_Descrip[] = "Simple intercomm reduce test";

*/

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

{

    int errs = 0, err;

    int *sendbuf = 0, *recvbuf = 0;

    int leftGroup, i, count, rank, rsize;

    MPI_Comm comm;

    MPI_Datatype datatype;

    MTest_Init(&argc, &argv);

    datatype = MPI_INT;

    /* Get an intercommunicator */

    while (MTestGetIntercomm(&comm, &leftGroup, 4)) {

        if (comm == MPI_COMM_NULL)

            continue;

        MPI_Comm_rank(comm, &rank;;

        MPI_Comm_remote_size(comm, &rsize);

        /* To improve reporting of problems about operations, we

         * change the error handler to errors return */

        MPI_Comm_set_errhandler(comm, MPI_ERRORS_RETURN);

        for (count = 1; count < 65000; count = 2 * count) {

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

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

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

                sendbuf[i] = -1;

                recvbuf[i] = -1;

            }

            if (leftGroup) {

                err = MTest_Reduce(sendbuf, recvbuf, count, datatype, MPI_SUM,

                                   (rank == 0) ? MPI_ROOT : MPI_PROC_NULL, comm);

                if (err) {

                    errs++;

                    MTestPrintError(err);

                }

                /* Test that no other process in this group received the

                 * broadcast, and that we got the right answers */

                if (rank == 0) {

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

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

                            errs++;

                        }

                    }

                }

                else {

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

                        if (recvbuf[i] != -1) {

                            errs++;

                        }

                    }

                }

            }

            else {

                /* In the right group */

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

                    sendbuf[i] = i;

                err = MTest_Reduce(sendbuf, recvbuf, count, datatype, MPI_SUM, 0, comm);

                if (err) {

                    errs++;

                    MTestPrintError(err);

                }

                /* Check that we have received no data */

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

                    if (recvbuf[i] != -1) {

                        errs++;

                    }

                }

            }

            free(sendbuf);

            free(recvbuf);

        }

        MTestFreeComm(&comm);

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}