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 */
25 MPI_Group MPI_GROUP_EMPTY = &mpi_MPI_GROUP_EMPTY;
27 MPI_Group smpi_group_new(int size) {
31 count = smpi_process_count();
32 group = xbt_new(s_smpi_mpi_group_t, 1);
34 group->rank_to_index_map = xbt_new(int, size);
35 group->index_to_rank_map = xbt_new(int, count);
37 for(i = 0; i < size; i++) {
38 group->rank_to_index_map[i] = MPI_UNDEFINED;
40 for(i = 0; i < count; i++) {
41 group->index_to_rank_map[i] = MPI_UNDEFINED;
46 void smpi_group_destroy(MPI_Group group) {
47 if(smpi_group_unuse(group) <= 0) {
48 xbt_free(group->rank_to_index_map);
49 xbt_free(group->index_to_rank_map);
54 void smpi_group_set_mapping(MPI_Group group, int index, int rank) {
55 if(rank < group->size && index < smpi_process_count()) {
56 group->rank_to_index_map[rank] = index;
57 group->index_to_rank_map[index] = rank;
61 int smpi_group_index(MPI_Group group, int rank) {
62 int index = MPI_UNDEFINED;
64 if(rank < group->size) {
65 index = group->rank_to_index_map[rank];
70 int smpi_group_rank(MPI_Group group, int index) {
71 int rank = MPI_UNDEFINED;
73 if(index < smpi_process_count()) {
74 rank = group->index_to_rank_map[index];
79 int smpi_group_use(MPI_Group group) {
81 return group->refcount;
84 int smpi_group_unuse(MPI_Group group) {
86 return group->refcount;
89 int smpi_group_size(MPI_Group group) {
93 int smpi_group_compare(MPI_Group group1, MPI_Group group2) {
95 int i, index, rank, size;
98 if(smpi_group_size(group1) != smpi_group_size(group2)) {
101 size = smpi_group_size(group2);
102 for(i = 0; i < size; i++) {
103 index = smpi_group_index(group1, i);
104 rank = smpi_group_rank(group2, index);
105 if(rank == MPI_UNDEFINED) {
106 result = MPI_UNEQUAL;
110 result = MPI_SIMILAR;