1 /* Copyright (c) 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_group, smpi,
10 "Logging specific to SMPI (group)");
12 typedef struct s_smpi_mpi_group {
14 int *rank_to_index_map;
15 int *index_to_rank_map;
19 static s_smpi_mpi_group_t mpi_MPI_GROUP_EMPTY = {
21 NULL, /* rank_to_index_map */
22 NULL, /* index_to_rank_map */
23 1, /* refcount: start > 0 so that this group never gets freed */
26 MPI_Group MPI_GROUP_EMPTY = &mpi_MPI_GROUP_EMPTY;
28 MPI_Group smpi_group_new(int size)
33 count = smpi_process_count();
34 group = xbt_new(s_smpi_mpi_group_t, 1);
36 group->rank_to_index_map = xbt_new(int, size);
37 group->index_to_rank_map = xbt_new(int, count);
39 for (i = 0; i < size; i++) {
40 group->rank_to_index_map[i] = MPI_UNDEFINED;
42 for (i = 0; i < count; i++) {
43 group->index_to_rank_map[i] = MPI_UNDEFINED;
48 void smpi_group_destroy(MPI_Group group)
50 if (smpi_group_unuse(group) <= 0) {
51 xbt_free(group->rank_to_index_map);
52 xbt_free(group->index_to_rank_map);
57 void smpi_group_set_mapping(MPI_Group group, int index, int rank)
59 if (rank < group->size && index < smpi_process_count()) {
60 group->rank_to_index_map[rank] = index;
61 group->index_to_rank_map[index] = rank;
65 int smpi_group_index(MPI_Group group, int rank)
67 int index = MPI_UNDEFINED;
69 if (0 <= rank && rank < group->size) {
70 index = group->rank_to_index_map[rank];
75 int smpi_group_rank(MPI_Group group, int index)
77 int rank = MPI_UNDEFINED;
79 if (index < smpi_process_count()) {
80 rank = group->index_to_rank_map[index];
85 int smpi_group_use(MPI_Group group)
88 return group->refcount;
91 int smpi_group_unuse(MPI_Group group)
94 return group->refcount;
97 int smpi_group_size(MPI_Group group)
102 int smpi_group_compare(MPI_Group group1, MPI_Group group2)
105 int i, index, rank, size;
108 if (smpi_group_size(group1) != smpi_group_size(group2)) {
109 result = MPI_UNEQUAL;
111 size = smpi_group_size(group2);
112 for (i = 0; i < size; i++) {
113 index = smpi_group_index(group1, i);
114 rank = smpi_group_rank(group2, index);
115 if (rank == MPI_UNDEFINED) {
116 result = MPI_UNEQUAL;
120 result = MPI_SIMILAR;