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/* -*- 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 "mpitest.h"
#define ITER 100
int main(int argc, char *argv[])
{
int rank, nproc, i;
int errors = 0, all_errors = 0;
int *buf;
MPI_Win window;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nproc);
if (nproc < 2) {
if (rank == 0)
printf("Error: must be run with two or more processes\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
/** Create using MPI_Win_create() **/
if (rank == 0) {
MPI_Alloc_mem(sizeof(int), MPI_INFO_NULL, &buf);
*buf = nproc - 1;
} else
buf = NULL;
MPI_Win_create(buf, sizeof(int) * (rank == 0), 1, MPI_INFO_NULL, MPI_COMM_WORLD, &window);
/* Test flush of an empty epoch */
MPI_Win_lock(MPI_LOCK_SHARED, 0, 0, window);
MPI_Win_flush_all(window);
MPI_Win_unlock(0, window);
MPI_Barrier(MPI_COMM_WORLD);
/* Test third-party communication, through rank 0. */
MPI_Win_lock(MPI_LOCK_SHARED, 0, 0, window);
for (i = 0; i < ITER; i++) {
int val = -1, exp = -1;
/* Processes form a ring. Process 0 starts first, then passes a token
* to the right. Each process, in turn, performs third-party
* communication via process 0's window. */
if (rank > 0) {
MPI_Recv(NULL, 0, MPI_BYTE, rank - 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
}
MPI_Get_accumulate(&rank, 1, MPI_INT, &val, 1, MPI_INT, 0, 0, 1, MPI_INT, MPI_REPLACE,
window);
MPI_Win_flush(0, window);
exp = (rank + nproc - 1) % nproc;
if (val != exp) {
printf("%d - Got %d, expected %d\n", rank, val, exp);
errors++;
}
if (rank < nproc - 1) {
MPI_Send(NULL, 0, MPI_BYTE, rank + 1, 0, MPI_COMM_WORLD);
}
MPI_Barrier(MPI_COMM_WORLD);
}
MPI_Win_unlock(0, window);
MPI_Win_free(&window);
if (buf)
MPI_Free_mem(buf);
MTest_Finalize(errors);
return MTestReturnValue(all_errors);
}
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