1 /* Copyright (c) 2009-2015. 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_dijkstra.hpp"
8 #include "src/surf/network_interface.hpp"
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_dijkstra, surf, "Routing part of surf -- dijkstra routing logic");
14 static void route_cache_elem_free(void *e)
16 route_cache_element_t elm = (route_cache_element_t) e;
18 xbt_free(elm->pred_arr);
23 static void graph_node_map_elem_free(void *e)
25 graph_node_map_element_t elm = (graph_node_map_element_t) e;
29 static void graph_edge_data_free(void *e) // FIXME: useless code duplication
31 sg_platf_route_cbarg_t e_route = (sg_platf_route_cbarg_t) e;
33 xbt_dynar_free(&(e_route->link_list));
38 /* Utility functions */
42 void AsDijkstra::Seal()
44 xbt_node_t node = NULL;
45 unsigned int cursor2, cursor;
47 /* Create the topology graph */
49 routeGraph_ = xbt_graph_new_graph(1, NULL);
51 graphNodeMap_ = xbt_dict_new_homogeneous(&graph_node_map_elem_free);
53 /* Add the loopback if needed */
54 if (routing_platf->loopback_ && hierarchy_ == SURF_ROUTING_BASE) {
55 xbt_dynar_foreach(xbt_graph_get_nodes(routeGraph_), cursor, node) {
56 xbt_edge_t edge = NULL;
59 xbt_dynar_foreach(xbt_graph_node_get_outedges(node), cursor2, edge) {
60 if (xbt_graph_edge_get_target(edge) == node) {
67 sg_platf_route_cbarg_t e_route = xbt_new0(s_sg_platf_route_cbarg_t, 1);
68 e_route->link_list = xbt_dynar_new(sizeof(Link*), NULL);
69 xbt_dynar_push(e_route->link_list, &routing_platf->loopback_);
70 xbt_graph_new_edge(routeGraph_, node, node, e_route);
75 /* initialize graph indexes in nodes after graph has been built */
76 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
78 xbt_dynar_foreach(nodes, cursor, node) {
79 graph_node_data_t data = (graph_node_data_t) xbt_graph_node_get_data(node);
80 data->graph_id = cursor;
84 xbt_node_t AsDijkstra::routeGraphNewNode(int id, int graph_id)
86 xbt_node_t node = NULL;
87 graph_node_data_t data = NULL;
88 graph_node_map_element_t elm = NULL;
90 data = xbt_new0(struct graph_node_data, 1);
92 data->graph_id = graph_id;
93 node = xbt_graph_new_node(routeGraph_, data);
95 elm = xbt_new0(struct graph_node_map_element, 1);
97 xbt_dict_set_ext(graphNodeMap_, (char *) (&id), sizeof(int), (xbt_dictelm_t) elm, NULL);
102 graph_node_map_element_t AsDijkstra::nodeMapSearch(int id)
104 return (graph_node_map_element_t)xbt_dict_get_or_null_ext(graphNodeMap_, (char *) (&id), sizeof(int));
109 void AsDijkstra::newRoute(int src_id, int dst_id, sg_platf_route_cbarg_t e_route)
111 XBT_DEBUG("Load Route from \"%d\" to \"%d\"", src_id, dst_id);
112 xbt_node_t src = NULL;
113 xbt_node_t dst = NULL;
115 graph_node_map_element_t src_elm = nodeMapSearch(src_id);
116 graph_node_map_element_t dst_elm = nodeMapSearch(dst_id);
124 /* add nodes if they don't exist in the graph */
125 if (src_id == dst_id && src == NULL && dst == NULL) {
126 src = this->routeGraphNewNode(src_id, -1);
130 src = this->routeGraphNewNode(src_id, -1);
133 dst = this->routeGraphNewNode(dst_id, -1);
137 /* add link as edge to graph */
138 xbt_graph_new_edge(routeGraph_, src, dst, e_route);
141 xbt_dynar_t AsDijkstra::getOneLinkRoutes()
143 xbt_dynar_t ret = xbt_dynar_new(sizeof(Onelink*), xbt_free_f);
144 sg_platf_route_cbarg_t route = xbt_new0(s_sg_platf_route_cbarg_t,1);
145 route->link_list = xbt_dynar_new(sizeof(Link*),NULL);
147 int table_size = (int)xbt_dynar_length(vertices_);
148 for(int src=0; src < table_size; src++) {
149 for(int dst=0; dst< table_size; dst++) {
150 xbt_dynar_reset(route->link_list);
151 NetCard *src_elm = xbt_dynar_get_as(vertices_, src, NetCard*);
152 NetCard *dst_elm = xbt_dynar_get_as(vertices_, dst, NetCard*);
153 this->getRouteAndLatency(src_elm, dst_elm,route, NULL);
155 if (xbt_dynar_length(route->link_list) == 1) {
156 void *link = *(void **) xbt_dynar_get_ptr(route->link_list, 0);
158 if (hierarchy_ == SURF_ROUTING_BASE)
159 onelink = new Onelink(link, src_elm, dst_elm);
160 else if (hierarchy_ == SURF_ROUTING_RECURSIVE)
161 onelink = new Onelink(link, route->gw_src, route->gw_dst);
163 onelink = new Onelink(link, NULL, NULL);
164 xbt_dynar_push(ret, &onelink);
171 void AsDijkstra::getRouteAndLatency(NetCard *src, NetCard *dst, sg_platf_route_cbarg_t route, double *lat)
173 getRouteCheckParams(src, dst);
174 int src_id = src->id();
175 int dst_id = dst->id();
177 int *pred_arr = NULL;
178 sg_platf_route_cbarg_t e_route;
182 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
184 /* Use the graph_node id mapping set to quickly find the nodes */
185 graph_node_map_element_t src_elm = nodeMapSearch(src_id);
186 graph_node_map_element_t dst_elm = nodeMapSearch(dst_id);
188 int src_node_id = ((graph_node_data_t) xbt_graph_node_get_data(src_elm->node))->graph_id;
189 int dst_node_id = ((graph_node_data_t) xbt_graph_node_get_data(dst_elm->node))->graph_id;
191 /* if the src and dst are the same */
192 if (src_node_id == dst_node_id) {
194 xbt_node_t node_s_v = xbt_dynar_get_as(nodes, src_node_id, xbt_node_t);
195 xbt_node_t node_e_v = xbt_dynar_get_as(nodes, dst_node_id, xbt_node_t);
196 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_s_v, node_e_v);
199 THROWF(arg_error, 0, "No route from '%s' to '%s'", src->name(), dst->name());
201 e_route = (sg_platf_route_cbarg_t) xbt_graph_edge_get_data(edge);
203 xbt_dynar_foreach(e_route->link_list, cpt, link) {
204 xbt_dynar_unshift(route->link_list, &link);
206 *lat += static_cast<Link*>(link)->getLatency();
211 route_cache_element_t elm = NULL;
212 if (routeCache_) { /* cache mode */
213 elm = (route_cache_element_t)
214 xbt_dict_get_or_null_ext(routeCache_, (char *) (&src_id), sizeof(int));
217 if (elm) { /* cached mode and cache hit */
218 pred_arr = elm->pred_arr;
219 } else { /* not cached mode, or cache miss */
221 int nr_nodes = xbt_dynar_length(nodes);
222 double * cost_arr = xbt_new0(double, nr_nodes); /* link cost from src to other hosts */
223 pred_arr = xbt_new0(int, nr_nodes); /* predecessors in path from src */
224 xbt_heap_t pqueue = xbt_heap_new(nr_nodes, xbt_free_f);
227 cost_arr[src_node_id] = 0.0;
229 for (int i = 0; i < nr_nodes; i++) {
230 if (i != src_node_id) {
231 cost_arr[i] = DBL_MAX;
236 /* initialize priority queue */
237 int *nodeid = xbt_new0(int, 1);
239 xbt_heap_push(pqueue, nodeid, cost_arr[i]);
243 /* apply dijkstra using the indexes from the graph's node array */
244 while (xbt_heap_size(pqueue) > 0) {
245 int *v_id = (int *) xbt_heap_pop(pqueue);
246 xbt_node_t v_node = xbt_dynar_get_as(nodes, *v_id, xbt_node_t);
247 xbt_edge_t edge = NULL;
250 xbt_dynar_foreach(xbt_graph_node_get_outedges(v_node), cursor, edge) {
251 xbt_node_t u_node = xbt_graph_edge_get_target(edge);
252 graph_node_data_t data = (graph_node_data_t) xbt_graph_node_get_data(u_node);
253 int u_id = data->graph_id;
254 sg_platf_route_cbarg_t tmp_e_route = (sg_platf_route_cbarg_t) xbt_graph_edge_get_data(edge);
255 int cost_v_u = (tmp_e_route->link_list)->used; /* count of links, old model assume 1 */
257 if (cost_v_u + cost_arr[*v_id] < cost_arr[u_id]) {
258 pred_arr[u_id] = *v_id;
259 cost_arr[u_id] = cost_v_u + cost_arr[*v_id];
260 int *nodeid = xbt_new0(int, 1);
262 xbt_heap_push(pqueue, nodeid, cost_arr[u_id]);
266 /* free item popped from pqueue */
271 xbt_heap_free(pqueue);
274 /* compose route path with links */
275 NetCard *gw_src = NULL, *gw_dst, *prev_gw_src, *first_gw = NULL;
276 NetCard *gw_dst_net_elm = NULL, *prev_gw_src_net_elm = NULL;
278 for (int v = dst_node_id; v != src_node_id; v = pred_arr[v]) {
279 xbt_node_t node_pred_v = xbt_dynar_get_as(nodes, pred_arr[v], xbt_node_t);
280 xbt_node_t node_v = xbt_dynar_get_as(nodes, v, xbt_node_t);
281 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_pred_v, node_v);
284 THROWF(arg_error, 0, "No route from '%s' to '%s'", src->name(), dst->name());
286 prev_gw_src = gw_src;
288 e_route = (sg_platf_route_cbarg_t) xbt_graph_edge_get_data(edge);
289 gw_src = e_route->gw_src;
290 gw_dst = e_route->gw_dst;
292 if (v == dst_node_id)
295 if (hierarchy_ == SURF_ROUTING_RECURSIVE && v != dst_node_id && strcmp(gw_dst->name(), prev_gw_src->name())) {
296 xbt_dynar_t e_route_as_to_as=NULL;
298 routing_platf->getRouteAndLatency(gw_dst_net_elm, prev_gw_src_net_elm, &e_route_as_to_as, NULL);
300 THROWF(arg_error,0,"No route from '%s' to '%s'", src->name(), dst->name());
302 xbt_dynar_foreach(e_route_as_to_as, cpt, link) {
303 xbt_dynar_insert_at(route->link_list, pos, &link);
305 *lat += static_cast<Link*>(link)->getLatency();
310 xbt_dynar_foreach(e_route->link_list, cpt, link) {
311 xbt_dynar_unshift(route->link_list, &link);
313 *lat += static_cast<Link*>(link)->getLatency();
318 if (hierarchy_ == SURF_ROUTING_RECURSIVE) {
319 route->gw_src = gw_src;
320 route->gw_dst = first_gw;
323 if (routeCache_ && elm == NULL) {
324 /* add to predecessor list of the current src-host to cache */
325 elm = xbt_new0(struct route_cache_element, 1);
326 elm->pred_arr = pred_arr;
328 xbt_dict_set_ext(routeCache_, (char *) (&src_id), sizeof(int), (xbt_dictelm_t) elm, NULL);
335 AsDijkstra::~AsDijkstra()
337 xbt_graph_free_graph(routeGraph_, &xbt_free_f, &graph_edge_data_free, &xbt_free_f);
338 xbt_dict_free(&graphNodeMap_);
339 xbt_dict_free(&routeCache_);
342 /* Creation routing model functions */
344 AsDijkstra::AsDijkstra(const char*name, bool cached)
345 : AsRoutedGraph(name)
348 routeCache_ = xbt_dict_new_homogeneous(&route_cache_elem_free);
351 void AsDijkstra::addRoute(sg_platf_route_cbarg_t route)
353 const char *srcName = route->src;
354 const char *dstName = route->dst;
355 NetCard *src = sg_netcard_by_name_or_null(srcName);
356 NetCard *dst = sg_netcard_by_name_or_null(dstName);
358 addRouteCheckParams(route);
360 /* Create the topology graph */
362 routeGraph_ = xbt_graph_new_graph(1, NULL);
364 graphNodeMap_ = xbt_dict_new_homogeneous(&graph_node_map_elem_free);
366 /* we don't check whether the route already exist, because the algorithm may find another path through some other nodes */
368 /* Add the route to the base */
369 sg_platf_route_cbarg_t e_route = newExtendedRoute(hierarchy_, route, 1);
370 newRoute(src->id(), dst->id(), e_route);
373 if (route->symmetrical == TRUE) {
374 if(!route->gw_dst && !route->gw_src)
375 XBT_DEBUG("Load Route from \"%s\" to \"%s\"", dstName, srcName);
377 XBT_DEBUG("Load ASroute from %s@%s to %s@%s", dstName, route->gw_dst->name(), srcName, route->gw_src->name());
379 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
380 xbt_node_t node_s_v = xbt_dynar_get_as(nodes, src->id(), xbt_node_t);
381 xbt_node_t node_e_v = xbt_dynar_get_as(nodes, dst->id(), xbt_node_t);
382 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_e_v, node_s_v);
385 THROWF(arg_error,0, "Route from %s@%s to %s@%s already exists", dstName, route->gw_dst->name(), srcName, route->gw_src->name());
387 if (route->gw_dst && route->gw_src) {
388 NetCard *gw_tmp = route->gw_src;
389 route->gw_src = route->gw_dst;
390 route->gw_dst = gw_tmp;
392 sg_platf_route_cbarg_t link_route_back = newExtendedRoute(hierarchy_, route, 0);
393 newRoute(dst->id(), src->id(), link_route_back);
395 xbt_dynar_free(&route->link_list);