/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2006 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[] = "Test of a large number of derived-datatype messages eagerly, with no preposted receive so that an MPI implementation may have to queue up messages on the sending side";

*/

#define MAX_MSGS 30

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

{

    int errs = 0;

    int rank, size, dest, source;

    int i, indices[40];

    MPI_Aint extent;

    int *buf, *bufs[MAX_MSGS];

    MPI_Comm comm;

    MPI_Datatype dtype;

    MPI_Request req[MAX_MSGS];

    MTest_Init(&argc, &argv);

    comm = MPI_COMM_WORLD;

    MPI_Comm_rank(comm, &rank;;

    MPI_Comm_size(comm, &size);

    source = 0;

    dest = size - 1;

    /* Setup by creating a blocked datatype that is likely to be processed

     * in a piecemeal fashion */

    for (i = 0; i < 30; i++) {

        indices[i] = i * 40;

    }

    /* 30 blocks of size 10 */

    MPI_Type_create_indexed_block(30, 10, indices, MPI_INT, &dtype);

    MPI_Type_commit(&dtype);

    /* Create the corresponding message buffers */

    MPI_Type_extent(dtype, &extent);

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

        bufs[i] = (int *) malloc(extent);

        if (!bufs[i]) {

            fprintf(stderr, "Unable to allocate buffer %d of size %ld\n", i, (long) extent);

            MPI_Abort(MPI_COMM_WORLD, 1);

        }

        MTEST_VG_MEM_INIT(bufs[i], extent);

    }

    buf = (int *) malloc(10 * 30 * sizeof(int));

    MPI_Barrier(MPI_COMM_WORLD);

    if (rank == dest) {

        MTestSleep(2);

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

            MPI_Recv(buf, 10 * 30, MPI_INT, source, i, comm, MPI_STATUS_IGNORE);

        }

    }

    else if (rank == source) {

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

            MPI_Isend(bufs[i], 1, dtype, dest, i, comm, &req[i]);

        }

        MPI_Waitall(MAX_MSGS, req, MPI_STATUSES_IGNORE);

    }

    MPI_Type_free(&dtype);

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

        free(bufs[i]);

    }

    free(buf);

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}