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) {
15 unsigned int i = 0, cur_dim_size = 1, dim_size_product = 1;
16 unsigned int* coords = (unsigned int*)malloc(xbt_dynar_length(dimensions)*sizeof(unsigned int));
17 for (i = 0; i < xbt_dynar_length(dimensions); i++) {
18 cur_dim_size = xbt_dynar_get_as(dimensions, i, int);
19 coords[i] = (rankId / dim_size_product) % cur_dim_size;
20 dim_size_product *= cur_dim_size;
27 AS_t model_torus_cluster_create(void)
29 return new simgrid::surf::AsClusterTorus();
35 /* Creation routing model functions */
36 AsClusterTorus::AsClusterTorus() : AsCluster()
41 /* Creation routing model functions */
42 AsClusterTorus::~AsClusterTorus()
44 if(p_dimensions) xbt_dynar_free(&p_dimensions);
48 void AsClusterTorus::create_links_for_node(sg_platf_cluster_cbarg_t cluster, int id, int rank, int position){
49 s_sg_platf_link_cbarg_t link = SG_PLATF_LINK_INITIALIZER;
53 * Create all links that exist in the torus.
54 * Each rank creates #dimensions-1 links
56 int neighbour_rank_id = 0; // The other node the link connects
57 int current_dimension = 0, // which dimension are we currently in?
58 // we need to iterate over all dimensions
59 // and create all links there
60 dim_product = 1; // Needed to calculate the next neighbour_id
61 for (j = 0; j < xbt_dynar_length(p_dimensions); j++) {
63 memset(&link, 0, sizeof(link));
64 current_dimension = xbt_dynar_get_as(p_dimensions, j, int);
65 neighbour_rank_id = ( ((int) rank / dim_product) % current_dimension == current_dimension-1) ? rank - (current_dimension-1)*dim_product : rank + dim_product;
66 //name of neighbor is not right for non contiguous cluster radicals (as id != rank in this case)
67 link_id = bprintf("%s_link_from_%i_to_%i", cluster->id, id, neighbour_rank_id);
69 link.bandwidth = cluster->bw;
70 link.latency = cluster->lat;
72 link.policy = cluster->sharing_policy;
73 sg_platf_new_link(&link);
74 s_surf_parsing_link_up_down_t info;
75 if (link.policy == SURF_LINK_FULLDUPLEX) {
76 char *tmp_link = bprintf("%s_UP", link_id);
77 info.link_up = Link::byName(tmp_link);
79 tmp_link = bprintf("%s_DOWN", link_id);
80 info.link_down = Link::byName(tmp_link);
83 info.link_up = Link::byName(link_id);
84 info.link_down = info.link_up;
87 * Add the link to its appropriate position;
88 * note that position rankId*(xbt_dynar_length(dimensions)+has_loopack?+has_limiter?)
89 * holds the link "rankId->rankId"
91 xbt_dynar_set(p_linkUpDownList, position
94 dim_product *= current_dimension;
100 void AsClusterTorus::parse_specific_arguments(sg_platf_cluster_cbarg_t cluster){
104 xbt_dynar_t dimensions = xbt_str_split(cluster->topo_parameters, ",");
106 if (!xbt_dynar_is_empty(dimensions)) {
107 p_dimensions= xbt_dynar_new(sizeof(int), NULL);
109 * We are in a torus cluster
110 * Parse attribute dimensions="dim1,dim2,dim3,...,dimN"
111 * and safe it in a dynarray.
112 * Additionally, we need to know how many ranks we have in total
114 xbt_dynar_foreach(dimensions, iter, groups) {
115 int tmp = surf_parse_get_int(xbt_dynar_get_as(dimensions, iter, char *));
116 xbt_dynar_set_as(p_dimensions, iter, int, tmp);
119 p_nb_links_per_node = xbt_dynar_length(p_dimensions);
122 xbt_dynar_free(&dimensions);
125 void AsClusterTorus::getRouteAndLatency(NetCard *src, NetCard *dst, sg_platf_route_cbarg_t route, double *lat){
127 XBT_VERB("torus_get_route_and_latency from '%s'[%d] to '%s'[%d]",
128 src->getName(), src->getId(),
129 dst->getName(), dst->getId());
131 if (dst->getRcType() == SURF_NETWORK_ELEMENT_ROUTER || src->getRcType() == SURF_NETWORK_ELEMENT_ROUTER) return;
133 if((src->getId() == dst->getId()) && p_has_loopback ){
134 s_surf_parsing_link_up_down_t info = xbt_dynar_get_as(p_linkUpDownList, src->getId() * p_nb_links_per_node, s_surf_parsing_link_up_down_t);
135 xbt_dynar_push_as(route->link_list, void *, info.link_up);
138 *lat += static_cast<Link*>(info.link_up)->getLatency();
144 * Dimension based routing routes through each dimension consecutively
145 * TODO Change to dynamic assignment
147 unsigned int j, cur_dim, dim_product = 1;
148 int current_node = src->getId();
149 int unsigned next_node = 0;
151 * Arrays that hold the coordinates of the current node and
152 * the target; comparing the values at the i-th position of
153 * both arrays, we can easily assess whether we need to route
154 * into this dimension or not.
156 unsigned int* myCoords, *targetCoords;
157 myCoords = rankId_to_coords(src->getId(), p_dimensions);
158 targetCoords = rankId_to_coords(dst->getId(), p_dimensions);
160 * linkOffset describes the offset where the link
161 * we want to use is stored
162 * (+1 is added because each node has a link from itself to itself,
163 * which can only be the case if src->m_id == dst->m_id -- see above
164 * for this special case)
166 int nodeOffset = (xbt_dynar_length(p_dimensions)+1)*src->getId();
168 int linkOffset = nodeOffset;
169 bool use_lnk_up = false; // Is this link of the form "cur -> next" or "next -> cur"?
170 // false means: next -> cur
171 while (current_node != dst->getId()) {
172 dim_product = 1; // First, we will route in x-dimension
173 for (j = 0; j < xbt_dynar_length(p_dimensions); j++) {
174 cur_dim = xbt_dynar_get_as(p_dimensions, j, int);
176 // current_node/dim_product = position in current dimension
177 if ((current_node/dim_product) % cur_dim != (dst->getId()/dim_product) % cur_dim) {
179 if (( targetCoords[j] > myCoords[j] && targetCoords[j] <= myCoords[j]+cur_dim/2) // Is the target node on the right, without the wrap-around?
180 || ( 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?
181 if ((current_node / dim_product) % cur_dim == cur_dim-1)
182 next_node = (current_node+dim_product-dim_product*cur_dim);
184 next_node = (current_node+dim_product);
186 // HERE: We use *CURRENT* node for calculation (as opposed to next_node)
187 nodeOffset = current_node*(p_nb_links_per_node);
188 linkOffset = nodeOffset+p_has_loopback+p_has_limiter+j;
190 assert(linkOffset >= 0);
192 else { // Route to the left
193 if ((current_node / dim_product) % cur_dim == 0)
194 next_node = (current_node-dim_product+dim_product*cur_dim);
196 next_node = (current_node-dim_product);
198 // HERE: We use *next* node for calculation (as opposed to current_node!)
199 nodeOffset = next_node*(p_nb_links_per_node);
200 linkOffset = nodeOffset+j+p_has_loopback+p_has_limiter;
203 assert(linkOffset >= 0);
205 XBT_DEBUG("torus_get_route_and_latency - current_node: %i, next_node: %u, linkOffset is %i",
206 current_node, next_node, linkOffset);
211 dim_product *= cur_dim;
214 s_surf_parsing_link_up_down_t info;
216 if (p_has_limiter){ // limiter for sender
217 info = xbt_dynar_get_as(p_linkUpDownList, nodeOffset + p_has_loopback, s_surf_parsing_link_up_down_t);
218 xbt_dynar_push_as(route->link_list, void *, info.link_up);
221 info = xbt_dynar_get_as(p_linkUpDownList,linkOffset, s_surf_parsing_link_up_down_t);
223 if (use_lnk_up == false){
224 xbt_dynar_push_as(route->link_list,void*,info.link_down);
227 *lat += static_cast<Link*>(info.link_down)->getLatency();
229 xbt_dynar_push_as(route->link_list,void*,info.link_up);
232 *lat += static_cast<Link*>(info.link_up)->getLatency();
234 current_node = next_node;