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;
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_Comm_split_type(MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, rank, MPI_INFO_NULL, &shm_comm);
36 MPI_Comm_rank(shm_comm, &shm_rank);
37 MPI_Comm_size(shm_comm, &shm_nproc);
39 /* Allocate ELEM_PER_PROC integers for each process */
40 MPI_Win_allocate_shared(sizeof(int) * ELEM_PER_PROC, sizeof(int), MPI_INFO_NULL,
41 shm_comm, &my_base, &shm_win);
43 /* Locate absolute base */
44 MPI_Win_shared_query(shm_win, MPI_PROC_NULL, &size, &disp_unit, &base);
46 /* make sure the query returned the right values */
47 if (disp_unit != sizeof(int))
49 if (size != ELEM_PER_PROC * sizeof(int))
51 if ((shm_rank == 0) && (base != my_base))
53 if (shm_rank && (base == my_base))
57 printf("%d -- size = %d baseptr = %p my_baseptr = %p\n", shm_rank,
58 (int) size, (void *) base, (void *) my_base);
60 MPI_Win_lock_all(MPI_MODE_NOCHECK, shm_win);
62 /* Write to all my data */
63 for (i = 0; i < ELEM_PER_PROC; i++) {
67 MPI_Win_sync(shm_win);
68 MPI_Barrier(shm_comm);
69 MPI_Win_sync(shm_win);
71 /* Read and verify everyone's data */
72 for (i = 0; i < shm_nproc; i++) {
73 for (j = 0; j < ELEM_PER_PROC; j++) {
74 if (base[i * ELEM_PER_PROC + j] != j) {
76 printf("%d -- Got %d at rank %d index %d, expected %d\n", shm_rank,
77 base[i * ELEM_PER_PROC + j], i, j, j);
82 MPI_Win_unlock_all(shm_win);
83 MPI_Win_free(&shm_win);
84 MPI_Comm_free(&shm_comm);
86 MPI_Reduce(&errors, &all_errors, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
88 if (rank == 0 && all_errors == 0)
89 printf(" No Errors\n");