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

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

/* One-Sided MPI 2-D Strided Accumulate Test

 *

 * Author: James Dinan <dinan@mcs.anl.gov>

 * Date  : December, 2010

 *

 * This code performs one-sided accumulate into a 2d patch of a shared array.

 */

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include <mpi.h>

#include "mpitest.h"

#include "squelch.h"

#define XDIM 1024

#define YDIM 1024

#define ITERATIONS 10

int main(int argc, char **argv)

{

    int i, j, rank, nranks, peer, bufsize, errors;

    double *buffer, *src_buf;

    MPI_Win buf_win;

    MTest_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    MPI_Comm_size(MPI_COMM_WORLD, &nranks);

    bufsize = XDIM * YDIM * sizeof(double);

    MPI_Alloc_mem(bufsize, MPI_INFO_NULL, &buffer);

    MPI_Alloc_mem(bufsize, MPI_INFO_NULL, &src_buf);

    for (i = 0; i < XDIM * YDIM; i++) {

        *(buffer + i) = 1.0 + rank;

        *(src_buf + i) = 1.0 + rank;

    }

    MPI_Win_create(buffer, bufsize, 1, MPI_INFO_NULL, MPI_COMM_WORLD, &buf_win);

    peer = (rank + 1) % nranks;

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

        MPI_Win_lock(MPI_LOCK_EXCLUSIVE, peer, 0, buf_win);

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

            MPI_Accumulate(src_buf + j * XDIM, XDIM, MPI_DOUBLE, peer,

                           j * XDIM * sizeof(double), XDIM, MPI_DOUBLE, MPI_SUM, buf_win);

        }

        MPI_Win_unlock(peer, buf_win);

    }

    MPI_Barrier(MPI_COMM_WORLD);

    MPI_Win_lock(MPI_LOCK_EXCLUSIVE, rank, 0, buf_win);

    for (i = errors = 0; i < XDIM; i++) {

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

            const double actual = *(buffer + i + j * XDIM);

            const double expected =

                (1.0 + rank) + (1.0 + ((rank + nranks - 1) % nranks)) * (ITERATIONS);

            if (fabs(actual - expected) > 1.0e-10) {

                SQUELCH(printf("%d: Data validation failed at [%d, %d] expected=%f actual=%f\n",

                               rank, j, i, expected, actual););

                errors++;

                fflush(stdout);

            }

        }

    }

    MPI_Win_unlock(rank, buf_win);

    MPI_Win_free(&buf_win);

    MPI_Free_mem(buffer);

    MPI_Free_mem(src_buf);

    MTest_Finalize(errors);

    MPI_Finalize();

    return MTestReturnValue(errors);

}