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

/*

 *

 *  (C) 2009 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[] = "A simple test of MPI_Reduce_local";

*/

#define MAX_BUF_ELEMENTS (65000)

static int uop_errs = 0;

/* prototype to keep the compiler happy */

static void user_op(void *invec, void *inoutvec, int *len, MPI_Datatype * datatype);

static void user_op(void *invec, void *inoutvec, int *len, MPI_Datatype * datatype)

{

    int i;

    int *invec_int = (int *) invec;

    int *inoutvec_int = (int *) inoutvec;

    if (*datatype != MPI_INT) {

        ++uop_errs;

        printf("invalid datatype passed to user_op");

        return;

    }

    for (i = 0; i < *len; ++i) {

        inoutvec_int[i] = invec_int[i] * 2 + inoutvec_int[i];

    }

}

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

{

    int errs = 0;

    int i;

    int *inbuf = NULL;

    int *inoutbuf = NULL;

    int count = -1;

    MPI_Op uop = MPI_OP_NULL;

    MTest_Init(&argc, &argv);

#if MTEST_HAVE_MIN_MPI_VERSION(2,2)

    /* this function was added in MPI-2.2 */

    inbuf = malloc(sizeof(int) * MAX_BUF_ELEMENTS);

    inoutbuf = malloc(sizeof(int) * MAX_BUF_ELEMENTS);

    for (count = 0; count < MAX_BUF_ELEMENTS; count > 0 ? count *= 2 : count++) {

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

            inbuf[i] = i;

            inoutbuf[i] = i;

        }

        MPI_Reduce_local(inbuf, inoutbuf, count, MPI_INT, MPI_SUM);

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

            if (inbuf[i] != i) {

                ++errs;

                if (inoutbuf[i] != (2 * i))

                    ++errs;

            }

    }

    /* make sure that user-define ops work too */

    MPI_Op_create(&user_op, 0 /*!commute */ , &uop);

    for (count = 0; count < MAX_BUF_ELEMENTS; count > 0 ? count *= 2 : count++) {

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

            inbuf[i] = i;

            inoutbuf[i] = i;

        }

        MPI_Reduce_local(inbuf, inoutbuf, count, MPI_INT, uop);

        errs += uop_errs;

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

            if (inbuf[i] != i) {

                ++errs;

                if (inoutbuf[i] != (3 * i))

                    ++errs;

            }

    }

    MPI_Op_free(&uop);

    free(inbuf);

    free(inoutbuf);

#endif

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}