/* -*- 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 allreduce 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_Errhandler_set(comm, MPI_ERRORS_RETURN);

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

            /* printf("rank = %d(%d)\n", rank, leftGroup); fflush(stdout); */

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

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

            if (leftGroup) {

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

                    sendbuf[i] = i;

            } else {

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

                    sendbuf[i] = -i;

            }

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

                recvbuf[i] = 0;

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

            if (err) {

                errs++;

                MTestPrintError(err);

            }

            /* In each process should be the sum of the values from the

             * other process */

            if (leftGroup) {

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

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

                        errs++;

                        if (errs < 10) {

                            fprintf(stderr, "recvbuf[%d] = %d\n", i, recvbuf[i]);

                        }

                    }

                }

            } else {

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

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

                        errs++;

                        if (errs < 10) {

                            fprintf(stderr, "recvbuf[%d] = %d\n", i, recvbuf[i]);

                        }

                    }

                }

            }

            free(sendbuf);

            free(recvbuf);

        }

        MTestFreeComm(&comm);

    }

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}