1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
4 * (C) 2014 by Argonne National Laboratory.
5 * See COPYRIGHT in top-level directory.
14 const int verbose = 0;
16 int main(int argc, char **argv)
19 int shm_rank, shm_nproc;
21 int errors = 0, all_errors = 0;
22 int **bases = NULL, *abs_base, *my_base;
26 int ELEM_PER_PROC = 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 /* Platform does not support shared memory, just return. */
43 bases = calloc(shm_nproc, sizeof(int *));
45 if (shm_rank == 0 || shm_rank == shm_nproc - 1) {
49 /* Allocate ELEM_PER_PROC integers for each process */
50 MPI_Win_allocate_shared(sizeof(int) * ELEM_PER_PROC, sizeof(int), MPI_INFO_NULL,
51 shm_comm, &my_base, &shm_win);
53 /* Locate absolute base */
54 MPI_Win_shared_query(shm_win, MPI_PROC_NULL, &size, &disp_unit, &abs_base);
57 printf("%d -- allocate shared: my_base = %p, absolute base = %p\n", shm_rank, my_base,
60 for (i = 0; i < shm_nproc; i++) {
61 MPI_Win_shared_query(shm_win, i, &size, &disp_unit, &bases[i]);
63 printf("%d -- shared query: base[%d]=%p, size %ld, unit %d\n",
64 shm_rank, i, bases[i], size, disp_unit);
67 MPI_Win_lock_all(MPI_MODE_NOCHECK, shm_win);
70 for (i = 0; i < ELEM_PER_PROC; i++) {
74 MPI_Win_sync(shm_win);
75 MPI_Barrier(shm_comm);
76 MPI_Win_sync(shm_win);
78 /* Read and verify everyone's data */
83 MPI_Win_sync(shm_win);
84 MPI_Barrier(shm_comm);
85 MPI_Win_sync(shm_win);
87 if (bases[0][0] != 1) {
89 printf("%d -- Got %d at rank %d index %d, expected %d\n", shm_rank, bases[0][0], 0, 0, 1);
92 if (bases[shm_nproc - 1][0] != 0) {
94 printf("%d -- Got %d at rank %d index %d, expected %d\n", shm_rank,
95 bases[shm_nproc - 1][0], shm_nproc - 1, 0, 0);
98 MPI_Win_unlock_all(shm_win);
99 MPI_Win_free(&shm_win);
101 MPI_Reduce(&errors, &all_errors, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
105 if (rank == 0 && all_errors == 0)
106 printf(" No Errors\n");
108 MPI_Comm_free(&shm_comm);