/* -*- 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 alltoall test";

*/

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

{

    int errs = 0, err;

    int *sendbuf = 0, *recvbuf = 0;

    int leftGroup, i, j, idx, count, rrank, rsize;

    MPI_Comm comm;

    MPI_Datatype datatype;

    MTest_Init(&argc, &argv);

    datatype = MPI_INT;

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

        if (comm == MPI_COMM_NULL)

            continue;

        for (count = 1; count < 66000; count = 2 * count) {

            /* Get an intercommunicator */

            MPI_Comm_remote_size(comm, &rsize);

            MPI_Comm_rank(comm, &rrank);

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

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

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

                recvbuf[i] = -1;

            if (leftGroup) {

                idx = 0;

                for (j = 0; j < rsize; j++) {

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

                        sendbuf[idx++] = i + rrank;

                    }

                }

                err = MTest_Alltoall(sendbuf, count, datatype, NULL, 0, datatype, comm);

                if (err) {

                    errs++;

                    MTestPrintError(err);

                }

            }

            else {

                int rank, size;

                MPI_Comm_rank(comm, &rank;;

                MPI_Comm_size(comm, &size);

                /* In the right group */

                err = MTest_Alltoall(NULL, 0, datatype, recvbuf, count, datatype, comm);

                if (err) {

                    errs++;

                    MTestPrintError(err);

                }

                /* Check that we have received the correct data */

                idx = 0;

                for (j = 0; j < rsize; j++) {

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

                        if (recvbuf[idx++] != i + j) {

                            errs++;

                            if (errs < 10)

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

                        }

                    }

                }

            }

            free(recvbuf);

            free(sendbuf);

        }

        MTestFreeComm(&comm);

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}