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;
28 AS_t model_torus_cluster_create(void)
30 return new simgrid::surf::AsClusterTorus();
35 AsClusterTorus::AsClusterTorus():AsCluster() {
37 AsClusterTorus::~AsClusterTorus() {
38 xbt_dynar_free(&p_dimensions);
41 void AsClusterTorus::create_links_for_node(sg_platf_cluster_cbarg_t cluster, int id, int rank, int position) {
42 s_sg_platf_link_cbarg_t link = SG_PLATF_LINK_INITIALIZER;
46 * Create all links that exist in the torus.
47 * Each rank creates #dimensions-1 links
49 int neighbour_rank_id = 0; // The other node the link connects
50 int current_dimension = 0, // which dimension are we currently in?
51 // we need to iterate over all dimensions
52 // and create all links there
53 dim_product = 1; // Needed to calculate the next neighbour_id
54 for (j = 0; j < xbt_dynar_length(p_dimensions); j++) {
56 memset(&link, 0, sizeof(link));
57 current_dimension = xbt_dynar_get_as(p_dimensions, j, int);
59 (((int) rank / dim_product) % current_dimension ==
60 current_dimension - 1) ? rank - (current_dimension - 1) * dim_product : rank + dim_product;
61 //name of neighbor is not right for non contiguous cluster radicals (as id != rank in this case)
62 link_id = bprintf("%s_link_from_%i_to_%i", cluster->id, id, neighbour_rank_id);
64 link.bandwidth = cluster->bw;
65 link.latency = cluster->lat;
67 link.policy = cluster->sharing_policy;
68 sg_platf_new_link(&link);
69 s_surf_parsing_link_up_down_t info;
70 if (link.policy == SURF_LINK_FULLDUPLEX) {
71 char *tmp_link = bprintf("%s_UP", link_id);
72 info.link_up = Link::byName(tmp_link);
74 tmp_link = bprintf("%s_DOWN", link_id);
75 info.link_down = Link::byName(tmp_link);
78 info.link_up = Link::byName(link_id);
79 info.link_down = info.link_up;
82 * Add the link to its appropriate position;
83 * note that position rankId*(xbt_dynar_length(dimensions)+has_loopack?+has_limiter?)
84 * holds the link "rankId->rankId"
86 xbt_dynar_set(p_linkUpDownList, position + j, &info);
87 dim_product *= current_dimension;
93 void AsClusterTorus::parse_specific_arguments(sg_platf_cluster_cbarg_t cluster) {
97 xbt_dynar_t dimensions = xbt_str_split(cluster->topo_parameters, ",");
99 if (!xbt_dynar_is_empty(dimensions)) {
100 p_dimensions = xbt_dynar_new(sizeof(int), NULL);
102 * We are in a torus cluster
103 * Parse attribute dimensions="dim1,dim2,dim3,...,dimN"
104 * and safe it in a dynarray.
105 * Additionally, we need to know how many ranks we have in total
107 xbt_dynar_foreach(dimensions, iter, groups) {
108 int tmp = surf_parse_get_int(xbt_dynar_get_as(dimensions, iter, char *));
109 xbt_dynar_set_as(p_dimensions, iter, int, tmp);
112 p_nb_links_per_node = xbt_dynar_length(p_dimensions);
115 xbt_dynar_free(&dimensions);
118 void AsClusterTorus::getRouteAndLatency(NetCard * src, NetCard * dst, sg_platf_route_cbarg_t route, double *lat) {
120 XBT_VERB("torus_get_route_and_latency from '%s'[%d] to '%s'[%d]",
121 src->getName(), src->getId(), dst->getName(), dst->getId());
123 if (dst->getRcType() == SURF_NETWORK_ELEMENT_ROUTER || src->getRcType() == SURF_NETWORK_ELEMENT_ROUTER)
126 if ((src->getId() == dst->getId()) && p_has_loopback) {
127 s_surf_parsing_link_up_down_t info =
128 xbt_dynar_get_as(p_linkUpDownList, src->getId() * p_nb_links_per_node, s_surf_parsing_link_up_down_t);
129 xbt_dynar_push_as(route->link_list, void *, info.link_up);
132 *lat += static_cast < Link * >(info.link_up)->getLatency();
138 * Dimension based routing routes through each dimension consecutively
139 * TODO Change to dynamic assignment
141 unsigned int j, cur_dim, dim_product = 1;
142 int current_node = src->getId();
143 int unsigned next_node = 0;
145 * Arrays that hold the coordinates of the current node and
146 * the target; comparing the values at the i-th position of
147 * both arrays, we can easily assess whether we need to route
148 * into this dimension or not.
150 unsigned int *myCoords, *targetCoords;
151 myCoords = rankId_to_coords(src->getId(), p_dimensions);
152 targetCoords = rankId_to_coords(dst->getId(), p_dimensions);
154 * linkOffset describes the offset where the link
155 * we want to use is stored
156 * (+1 is added because each node has a link from itself to itself,
157 * which can only be the case if src->m_id == dst->m_id -- see above
158 * for this special case)
160 int nodeOffset = (xbt_dynar_length(p_dimensions) + 1) * src->getId();
162 int linkOffset = nodeOffset;
163 bool use_lnk_up = false; // Is this link of the form "cur -> next" or "next -> cur"?
164 // false means: next -> cur
165 while (current_node != dst->getId()) {
166 dim_product = 1; // First, we will route in x-dimension
167 for (j = 0; j < xbt_dynar_length(p_dimensions); j++) {
168 cur_dim = xbt_dynar_get_as(p_dimensions, j, int);
170 // current_node/dim_product = position in current dimension
171 if ((current_node / dim_product) % cur_dim != (dst->getId() / dim_product) % cur_dim) {
173 if ((targetCoords[j] > myCoords[j] && targetCoords[j] <= myCoords[j] + cur_dim / 2) // Is the target node on the right, without the wrap-around?
174 || (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?
175 if ((current_node / dim_product) % cur_dim == cur_dim - 1)
176 next_node = (current_node + dim_product - dim_product * cur_dim);
178 next_node = (current_node + dim_product);
180 // HERE: We use *CURRENT* node for calculation (as opposed to next_node)
181 nodeOffset = current_node * (p_nb_links_per_node);
182 linkOffset = nodeOffset + p_has_loopback + p_has_limiter + j;
184 assert(linkOffset >= 0);
185 } else { // Route to the left
186 if ((current_node / dim_product) % cur_dim == 0)
187 next_node = (current_node - dim_product + dim_product * cur_dim);
189 next_node = (current_node - dim_product);
191 // HERE: We use *next* node for calculation (as opposed to current_node!)
192 nodeOffset = next_node * (p_nb_links_per_node);
193 linkOffset = nodeOffset + j + p_has_loopback + p_has_limiter;
196 assert(linkOffset >= 0);
198 XBT_DEBUG("torus_get_route_and_latency - current_node: %i, next_node: %u, linkOffset is %i",
199 current_node, next_node, linkOffset);
204 dim_product *= cur_dim;
207 s_surf_parsing_link_up_down_t info;
209 if (p_has_limiter) { // limiter for sender
210 info = xbt_dynar_get_as(p_linkUpDownList, nodeOffset + p_has_loopback, s_surf_parsing_link_up_down_t);
211 xbt_dynar_push_as(route->link_list, void *, info.link_up);
214 info = xbt_dynar_get_as(p_linkUpDownList, linkOffset, s_surf_parsing_link_up_down_t);
216 if (use_lnk_up == false) {
217 xbt_dynar_push_as(route->link_list, void *, info.link_down);
220 *lat += static_cast < Link * >(info.link_down)->getLatency();
222 xbt_dynar_push_as(route->link_list, void *, info.link_up);
225 *lat += static_cast < Link * >(info.link_up)->getLatency();
227 current_node = next_node;