1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
4 * (C) 2012 by Argonne National Laboratory.
5 * See COPYRIGHT in top-level directory.
14 #define ELEM_PER_PROC 10000
16 const int verbose = 0;
18 int main(int argc, char **argv)
20 int i, j, rank, nproc;
21 int shm_rank, shm_nproc;
22 MPI_Info alloc_shared_info;
23 int errors = 0, all_errors = 0;
29 MPI_Init(&argc, &argv);
31 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
32 MPI_Comm_size(MPI_COMM_WORLD, &nproc);
34 MPI_Info_create(&alloc_shared_info);
35 MPI_Info_set(alloc_shared_info, "alloc_shared_noncontig", "true");
37 MPI_Comm_split_type(MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, rank, MPI_INFO_NULL, &shm_comm);
39 MPI_Comm_rank(shm_comm, &shm_rank);
40 MPI_Comm_size(shm_comm, &shm_nproc);
42 /* Allocate ELEM_PER_PROC integers for each process */
43 MPI_Win_allocate_shared(sizeof(int) * ELEM_PER_PROC, sizeof(int), alloc_shared_info,
44 shm_comm, &my_base, &shm_win);
46 MPI_Win_lock_all(MPI_MODE_NOCHECK, shm_win);
48 /* Write to all my data */
49 for (i = 0; i < ELEM_PER_PROC; i++) {
53 MPI_Win_sync(shm_win);
54 MPI_Barrier(shm_comm);
55 MPI_Win_sync(shm_win);
57 /* Read and verify everyone's data */
58 for (i = 0; i < shm_nproc; i++) {
62 MPI_Win_shared_query(shm_win, i, &size, &disp_unit, &base);
63 assert(size >= ELEM_PER_PROC * sizeof(int));
65 for (j = 0; j < ELEM_PER_PROC; j++) {
68 printf("%d -- Got %d at rank %d index %d, expected %d\n", shm_rank,
74 MPI_Win_unlock_all(shm_win);
75 MPI_Win_free(&shm_win);
76 MPI_Comm_free(&shm_comm);
78 MPI_Info_free(&alloc_shared_info);
80 MPI_Reduce(&errors, &all_errors, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
82 if (rank == 0 && all_errors == 0)
83 printf(" No Errors\n");