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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2012 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <mpi.h>
#include "mpitest.h"
#define ELEM_PER_PROC 10000
const int verbose = 0;
int main(int argc, char **argv)
{
int i, j, rank, nproc;
int shm_rank, shm_nproc;
MPI_Info alloc_shared_info;
int errors = 0, all_errors = 0;
int disp_unit;
int *my_base, my_size;
MPI_Win shm_win;
MPI_Comm shm_comm;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &nproc);
MPI_Info_create(&alloc_shared_info);
MPI_Info_set(alloc_shared_info, "alloc_shared_noncontig", "true");
MPI_Comm_split_type(MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, rank, MPI_INFO_NULL, &shm_comm);
MPI_Comm_rank(shm_comm, &shm_rank);
MPI_Comm_size(shm_comm, &shm_nproc);
/* Allocate ELEM_PER_PROC integers on each even rank process */
my_size = (shm_rank % 2 == 0) ? sizeof(int) * ELEM_PER_PROC : 0;
MPI_Win_allocate_shared(my_size, sizeof(int), alloc_shared_info, shm_comm, &my_base, &shm_win);
for (i = 0; i < ELEM_PER_PROC; i++) {
MPI_Win_fence(MPI_MODE_NOPRECEDE, shm_win);
if (shm_rank % 2 == 0) {
MPI_Put(&i, 1, MPI_INT,
(shm_rank + 2 > shm_nproc) ? 0 : (shm_rank + 2) % shm_nproc,
i, 1, MPI_INT, shm_win);
}
MPI_Win_fence(MPI_MODE_NOSUCCEED, shm_win);
}
MPI_Barrier(shm_comm);
/* Read and verify everyone's data */
for (i = 0; i < shm_nproc; i++) {
int *base;
MPI_Aint size;
MPI_Win_shared_query(shm_win, i, &size, &disp_unit, &base);
if (i % 2 == 0) {
assert(size >= ELEM_PER_PROC * sizeof(int));
for (j = 0; j < ELEM_PER_PROC; j++) {
if (base[j] != j) {
errors++;
printf("%d -- Got %d at rank %d index %d, expected %d\n", shm_rank,
base[j], i, j, j);
}
}
}
else {
assert(size == 0);
assert(base == NULL);
}
}
MPI_Win_free(&shm_win);
MPI_Comm_free(&shm_comm);
MPI_Info_free(&alloc_shared_info);
MPI_Reduce(&errors, &all_errors, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
if (rank == 0 && all_errors == 0)
printf(" No Errors\n");
MPI_Finalize();
return 0;
}
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