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

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

/** Contended RMA put test -- James Dinan <dinan@mcs.anl.gov>

  *

  * Each process issues COUNT put operations to non-overlapping locations on

  * every other processs.

  */

#include <stdio.h>

#include <stdlib.h>

#include <assert.h>

#include "mpi.h"

#include "mpitest.h"

#define MAXELEMS      6400

#define COUNT         1000

static int me, nproc;

static const int verbose = 0;

int test_put(void);

int test_put(void)

{

    MPI_Win dst_win;

    double *dst_buf;

    double src_buf[MAXELEMS];

    int i, j;

    int errs = 0;

    MPI_Alloc_mem(sizeof(double) * nproc * MAXELEMS, MPI_INFO_NULL, &dst_buf);

    MPI_Win_create(dst_buf, sizeof(double) * nproc * MAXELEMS, 1, MPI_INFO_NULL,

                   MPI_COMM_WORLD, &dst_win);

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

        src_buf[i] = me + 1.0;

    MPI_Win_lock(MPI_LOCK_EXCLUSIVE, me, 0, dst_win);

    for (i = 0; i < nproc * MAXELEMS; i++)

        dst_buf[i] = 0.0;

    MPI_Win_unlock(me, dst_win);

    MPI_Barrier(MPI_COMM_WORLD);

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

        /* int target = (me + i) % nproc; */

        int target = i;

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

            if (verbose)

                printf("%2d -> %2d [%2d]\n", me, target, j);

            MPI_Win_lock(MPI_LOCK_EXCLUSIVE, target, 0, dst_win);

            MPI_Put(&src_buf[j], sizeof(double), MPI_BYTE, target,

                    (me * MAXELEMS + j) * sizeof(double), sizeof(double), MPI_BYTE, dst_win);

            MPI_Win_unlock(target, dst_win);

        }

    }

    MPI_Barrier(MPI_COMM_WORLD);

    /* Check that the correct data was returned.  This assumes that the

     * systems have the same data representations */

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

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

            if (dst_buf[i * MAXELEMS + j] != 1.0 + i) {

                errs++;

                printf("dst_buf[%d] = %e, expected %e\n",

                       i * MAXELEMS + j, dst_buf[i * MAXELEMS + j], 1.0 + i);

            }

        }

    }

    MPI_Win_free(&dst_win);

    MPI_Free_mem(dst_buf);

    return errs;

}

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

{

    int errs = 0;

    MTest_Init(&argc, &argv);

    MPI_Comm_size(MPI_COMM_WORLD, &nproc);

    MPI_Comm_rank(MPI_COMM_WORLD, &me);

    assert(COUNT <= MAXELEMS);

    if (me == 0 && verbose) {

        printf("Test starting on %d processes\n", nproc);

        fflush(stdout);

    }

    errs = test_put();

    MPI_Barrier(MPI_COMM_WORLD);

    MTest_Finalize(errs);

    MPI_Finalize();

    return MTestReturnValue(errs);

}