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) {
19 int i, j, rank, nproc;
20 int shm_rank, shm_nproc;
22 int errors = 0, all_errors = 0;
28 MPI_Init(&argc, &argv);
30 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
31 MPI_Comm_size(MPI_COMM_WORLD, &nproc);
33 MPI_Comm_split_type(MPI_COMM_WORLD, MPI_COMM_TYPE_SHARED, rank, MPI_INFO_NULL, &shm_comm);
35 MPI_Comm_rank(shm_comm, &shm_rank);
36 MPI_Comm_size(shm_comm, &shm_nproc);
38 /* Allocate ELEM_PER_PROC integers for each process */
39 MPI_Win_allocate_shared(sizeof(int)*ELEM_PER_PROC, sizeof(int), MPI_INFO_NULL,
40 shm_comm, &my_base, &shm_win);
42 /* Locate absolute base */
43 MPI_Win_shared_query(shm_win, MPI_PROC_NULL, &size, &disp_unit, &base);
45 if (verbose) printf("%d -- size = %d baseptr = %p my_baseptr = %p\n", shm_rank,
46 (int) size, (void*) base, (void*) my_base);
48 assert(size == ELEM_PER_PROC * sizeof(int));
50 assert(base == my_base);
52 assert(base != my_base);
54 MPI_Win_lock_all(MPI_MODE_NOCHECK, shm_win);
56 /* Write to all my data */
57 for (i = 0; i < ELEM_PER_PROC; i++) {
61 MPI_Win_sync(shm_win);
62 MPI_Barrier(shm_comm);
63 MPI_Win_sync(shm_win);
65 /* Read and verify everyone's data */
66 for (i = 0; i < shm_nproc; i++) {
67 for (j = 0; j < ELEM_PER_PROC; j++) {
68 if ( base[i*ELEM_PER_PROC + j] != j ) {
70 printf("%d -- Got %d at rank %d index %d, expected %d\n", shm_rank,
71 base[i*ELEM_PER_PROC + j], i, j, j);
76 MPI_Win_unlock_all(shm_win);
77 MPI_Win_free(&shm_win);
78 MPI_Comm_free(&shm_comm);
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");