1 /* Copyright (c) 2014-2015. 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. */
7 #include "src/surf/surf_routing_private.hpp"
8 #include "src/surf/surf_routing_cluster_torus.hpp"
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_cluster_torus, surf_route_cluster, "Torus Routing part of surf");
13 inline unsigned int *rankId_to_coords(int rankId, xbt_dynar_t dimensions)
16 unsigned int i = 0, cur_dim_size = 1, dim_size_product = 1;
17 unsigned int *coords = (unsigned int *) malloc(xbt_dynar_length(dimensions) * sizeof(unsigned int));
18 for (i = 0; i < xbt_dynar_length(dimensions); i++) {
19 cur_dim_size = xbt_dynar_get_as(dimensions, i, int);
20 coords[i] = (rankId / dim_size_product) % cur_dim_size;
21 dim_size_product *= cur_dim_size;
30 AsClusterTorus::AsClusterTorus(const char*name)
33 AsClusterTorus::~AsClusterTorus() {
34 xbt_dynar_free(&p_dimensions);
37 void AsClusterTorus::create_links_for_node(sg_platf_cluster_cbarg_t cluster, int id, int rank, int position) {
38 s_sg_platf_link_cbarg_t link = SG_PLATF_LINK_INITIALIZER;
42 * Create all links that exist in the torus.
43 * Each rank creates #dimensions-1 links
45 int neighbour_rank_id = 0; // The other node the link connects
46 int current_dimension = 0, // which dimension are we currently in?
47 // we need to iterate over all dimensions
48 // and create all links there
49 dim_product = 1; // Needed to calculate the next neighbour_id
50 for (j = 0; j < xbt_dynar_length(p_dimensions); j++) {
52 memset(&link, 0, sizeof(link));
53 current_dimension = xbt_dynar_get_as(p_dimensions, j, int);
55 (((int) rank / dim_product) % current_dimension ==
56 current_dimension - 1) ? rank - (current_dimension - 1) * dim_product : rank + dim_product;
57 //name of neighbor is not right for non contiguous cluster radicals (as id != rank in this case)
58 link_id = bprintf("%s_link_from_%i_to_%i", cluster->id, id, neighbour_rank_id);
60 link.bandwidth = cluster->bw;
61 link.latency = cluster->lat;
63 link.policy = cluster->sharing_policy;
64 sg_platf_new_link(&link);
65 s_surf_parsing_link_up_down_t info;
66 if (link.policy == SURF_LINK_FULLDUPLEX) {
67 char *tmp_link = bprintf("%s_UP", link_id);
68 info.link_up = Link::byName(tmp_link);
70 tmp_link = bprintf("%s_DOWN", link_id);
71 info.link_down = Link::byName(tmp_link);
74 info.link_up = Link::byName(link_id);
75 info.link_down = info.link_up;
78 * Add the link to its appropriate position;
79 * note that position rankId*(xbt_dynar_length(dimensions)+has_loopack?+has_limiter?)
80 * holds the link "rankId->rankId"
82 xbt_dynar_set(upDownLinks, position + j, &info);
83 dim_product *= current_dimension;
89 void AsClusterTorus::parse_specific_arguments(sg_platf_cluster_cbarg_t cluster) {
93 xbt_dynar_t dimensions = xbt_str_split(cluster->topo_parameters, ",");
95 if (!xbt_dynar_is_empty(dimensions)) {
96 p_dimensions = xbt_dynar_new(sizeof(int), NULL);
98 * We are in a torus cluster
99 * Parse attribute dimensions="dim1,dim2,dim3,...,dimN"
100 * and safe it in a dynarray.
101 * Additionally, we need to know how many ranks we have in total
103 xbt_dynar_foreach(dimensions, iter, groups) {
104 int tmp = surf_parse_get_int(xbt_dynar_get_as(dimensions, iter, char *));
105 xbt_dynar_set_as(p_dimensions, iter, int, tmp);
108 p_nb_links_per_node = xbt_dynar_length(p_dimensions);
111 xbt_dynar_free(&dimensions);
114 void AsClusterTorus::getRouteAndLatency(NetCard * src, NetCard * dst, sg_platf_route_cbarg_t route, double *lat) {
116 XBT_VERB("torus_get_route_and_latency from '%s'[%d] to '%s'[%d]",
117 src->name(), src->id(), dst->name(), dst->id());
119 if (dst->getRcType() == SURF_NETWORK_ELEMENT_ROUTER || src->getRcType() == SURF_NETWORK_ELEMENT_ROUTER)
122 if ((src->id() == dst->id()) && p_has_loopback) {
123 s_surf_parsing_link_up_down_t info =
124 xbt_dynar_get_as(upDownLinks, src->id() * p_nb_links_per_node, s_surf_parsing_link_up_down_t);
125 xbt_dynar_push_as(route->link_list, void *, info.link_up);
128 *lat += static_cast < Link * >(info.link_up)->getLatency();
134 * Dimension based routing routes through each dimension consecutively
135 * TODO Change to dynamic assignment
137 unsigned int j, cur_dim, dim_product = 1;
138 int current_node = src->id();
139 int unsigned next_node = 0;
141 * Arrays that hold the coordinates of the current node and
142 * the target; comparing the values at the i-th position of
143 * both arrays, we can easily assess whether we need to route
144 * into this dimension or not.
146 unsigned int *myCoords, *targetCoords;
147 myCoords = rankId_to_coords(src->id(), p_dimensions);
148 targetCoords = rankId_to_coords(dst->id(), p_dimensions);
150 * linkOffset describes the offset where the link
151 * we want to use is stored
152 * (+1 is added because each node has a link from itself to itself,
153 * which can only be the case if src->m_id == dst->m_id -- see above
154 * for this special case)
156 int nodeOffset = (xbt_dynar_length(p_dimensions) + 1) * src->id();
158 int linkOffset = nodeOffset;
159 bool use_lnk_up = false; // Is this link of the form "cur -> next" or "next -> cur"?
160 // false means: next -> cur
161 while (current_node != dst->id()) {
162 dim_product = 1; // First, we will route in x-dimension
163 for (j = 0; j < xbt_dynar_length(p_dimensions); j++) {
164 cur_dim = xbt_dynar_get_as(p_dimensions, j, int);
166 // current_node/dim_product = position in current dimension
167 if ((current_node / dim_product) % cur_dim != (dst->id() / dim_product) % cur_dim) {
169 if ((targetCoords[j] > myCoords[j] && targetCoords[j] <= myCoords[j] + cur_dim / 2) // Is the target node on the right, without the wrap-around?
170 || (myCoords[j] > cur_dim / 2 && (myCoords[j] + cur_dim / 2) % cur_dim >= targetCoords[j])) { // Or do we need to use the wrap around to reach it?
171 if ((current_node / dim_product) % cur_dim == cur_dim - 1)
172 next_node = (current_node + dim_product - dim_product * cur_dim);
174 next_node = (current_node + dim_product);
176 // HERE: We use *CURRENT* node for calculation (as opposed to next_node)
177 nodeOffset = current_node * (p_nb_links_per_node);
178 linkOffset = nodeOffset + p_has_loopback + p_has_limiter + j;
180 assert(linkOffset >= 0);
181 } else { // Route to the left
182 if ((current_node / dim_product) % cur_dim == 0)
183 next_node = (current_node - dim_product + dim_product * cur_dim);
185 next_node = (current_node - dim_product);
187 // HERE: We use *next* node for calculation (as opposed to current_node!)
188 nodeOffset = next_node * (p_nb_links_per_node);
189 linkOffset = nodeOffset + j + p_has_loopback + p_has_limiter;
192 assert(linkOffset >= 0);
194 XBT_DEBUG("torus_get_route_and_latency - current_node: %i, next_node: %u, linkOffset is %i",
195 current_node, next_node, linkOffset);
200 dim_product *= cur_dim;
203 s_surf_parsing_link_up_down_t info;
205 if (p_has_limiter) { // limiter for sender
206 info = xbt_dynar_get_as(upDownLinks, nodeOffset + p_has_loopback, s_surf_parsing_link_up_down_t);
207 xbt_dynar_push_as(route->link_list, void *, info.link_up);
210 info = xbt_dynar_get_as(upDownLinks, linkOffset, s_surf_parsing_link_up_down_t);
212 if (use_lnk_up == false) {
213 xbt_dynar_push_as(route->link_list, void *, info.link_down);
216 *lat += static_cast < Link * >(info.link_down)->getLatency();
218 xbt_dynar_push_as(route->link_list, void *, info.link_up);
221 *lat += static_cast < Link * >(info.link_up)->getLatency();
223 current_node = next_node;