1 /* Copyright (c) 2009, 2010, 2011. 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 "surf_routing_private.h"
10 extern routing_global_t global_routing;
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_dijkstra, surf, "Routing part of surf -- dijkstra routing logic");
15 s_as_t generic_routing;
16 xbt_graph_t route_graph; /* xbt_graph */
17 xbt_dict_t graph_node_map; /* map */
18 xbt_dict_t route_cache; /* use in cache mode */
20 } s_as_dijkstra_t, *as_dijkstra_t;
23 typedef struct graph_node_data {
25 int graph_id; /* used for caching internal graph id's */
26 } s_graph_node_data_t, *graph_node_data_t;
28 typedef struct graph_node_map_element {
30 } s_graph_node_map_element_t, *graph_node_map_element_t;
32 typedef struct route_cache_element {
35 } s_route_cache_element_t, *route_cache_element_t;
39 static void route_cache_elem_free(void *e)
41 route_cache_element_t elm = (route_cache_element_t) e;
43 xbt_free(elm->pred_arr);
48 static void graph_node_map_elem_free(void *e)
50 graph_node_map_element_t elm = (graph_node_map_element_t) e;
54 static void graph_edge_data_free(void *e) // FIXME: useless code dupplication
56 route_t e_route = (route_t) e;
58 xbt_dynar_free(&(e_route->link_list));
59 xbt_free(e_route->src_gateway);
60 xbt_free(e_route->dst_gateway);
65 /* Utility functions */
67 static xbt_node_t route_graph_new_node(as_dijkstra_t as,
70 xbt_node_t node = NULL;
71 graph_node_data_t data = NULL;
72 graph_node_map_element_t elm = NULL;
74 data = xbt_new0(struct graph_node_data, 1);
76 data->graph_id = graph_id;
77 node = xbt_graph_new_node(as->route_graph, data);
79 elm = xbt_new0(struct graph_node_map_element, 1);
81 xbt_dict_set_ext(as->graph_node_map, (char *) (&id), sizeof(int),
82 (xbt_set_elm_t) elm, &graph_node_map_elem_free);
87 static graph_node_map_element_t
88 graph_node_map_search(as_dijkstra_t as, int id)
90 graph_node_map_element_t elm = (graph_node_map_element_t)
91 xbt_dict_get_or_null_ext(as->graph_node_map,
99 static void route_new_dijkstra(as_dijkstra_t as, int src_id,
100 int dst_id, route_t e_route)
102 XBT_DEBUG("Load Route from \"%d\" to \"%d\"", src_id, dst_id);
103 xbt_node_t src = NULL;
104 xbt_node_t dst = NULL;
106 graph_node_map_element_t src_elm = (graph_node_map_element_t)
107 xbt_dict_get_or_null_ext(as->graph_node_map,
110 graph_node_map_element_t dst_elm = (graph_node_map_element_t)
111 xbt_dict_get_or_null_ext(as->graph_node_map,
122 /* add nodes if they don't exist in the graph */
123 if (src_id == dst_id && src == NULL && dst == NULL) {
124 src = route_graph_new_node(as, src_id, -1);
128 src = route_graph_new_node(as, src_id, -1);
131 dst = route_graph_new_node(as, dst_id, -1);
135 /* add link as edge to graph */
136 xbt_graph_new_edge(as->route_graph, src, dst, e_route);
139 static void add_loopback_dijkstra(as_dijkstra_t as) {
140 xbt_dynar_t nodes = xbt_graph_get_nodes(as->route_graph);
142 xbt_node_t node = NULL;
143 unsigned int cursor2;
144 xbt_dynar_foreach(nodes, cursor2, node) {
145 xbt_dynar_t out_edges = xbt_graph_node_get_outedges(node);
146 xbt_edge_t edge = NULL;
150 xbt_dynar_foreach(out_edges, cursor, edge) {
151 xbt_node_t other_node = xbt_graph_edge_get_target(edge);
152 if (other_node == node) {
159 route_t e_route = xbt_new0(s_route_t, 1);
160 e_route->link_list = xbt_dynar_new(global_routing->size_of_link, NULL);
161 xbt_dynar_push(e_route->link_list,
162 &global_routing->loopback);
163 xbt_graph_new_edge(as->route_graph, node, node, e_route);
168 static void dijkstra_get_route(AS_t as_generic,
169 const char *src, const char *dst, route_t route);
171 static xbt_dynar_t dijkstra_get_onelink_routes(AS_t as)
173 // xbt_die("\"dijkstra_get_onelink_routes\" function not implemented yet");
174 xbt_dynar_t ret = xbt_dynar_new(sizeof(onelink_t), xbt_free);
176 //size_t table_size = xbt_dict_length(routing->generic_routing.to_index);
177 xbt_dict_cursor_t c1 = NULL, c2 = NULL;
178 char *k1, *d1, *k2, *d2;
179 xbt_dict_foreach(as->to_index, c1, k1, d1) {
180 xbt_dict_foreach(as->to_index, c2, k2, d2) {
181 route_t route = xbt_new0(s_route_t,1);
182 route->link_list = xbt_dynar_new(global_routing->size_of_link,NULL);
183 dijkstra_get_route(as, k1, k2,route);
185 if (xbt_dynar_length(route->link_list) == 1) {
187 *(void **) xbt_dynar_get_ptr(route->link_list, 0);
188 onelink_t onelink = xbt_new0(s_onelink_t, 1);
189 onelink->link_ptr = link;
190 if (as->hierarchy == SURF_ROUTING_BASE) {
191 onelink->src = xbt_strdup(k1);
192 onelink->dst = xbt_strdup(k2);
193 } else if (as->hierarchy ==
194 SURF_ROUTING_RECURSIVE) {
195 onelink->src = xbt_strdup(route->src_gateway);
196 onelink->dst = xbt_strdup(route->dst_gateway);
198 xbt_dynar_push(ret, &onelink);
205 static void dijkstra_get_route(AS_t asg,
206 const char *src, const char *dst,
211 as_dijkstra_t as = (as_dijkstra_t) asg;
213 generic_src_dst_check(asg, src, dst);
214 int *src_id = xbt_dict_get_or_null(asg->to_index, src);
215 int *dst_id = xbt_dict_get_or_null(asg->to_index, dst);
216 if (!src_id || !dst_id)
217 THROWF(arg_error,0,"No route from '%s' to '%s'",src,dst);
219 int *pred_arr = NULL;
228 xbt_dynar_t links = NULL;
229 route_cache_element_t elm = NULL;
230 xbt_dynar_t nodes = xbt_graph_get_nodes(as->route_graph);
232 /* Use the graph_node id mapping set to quickly find the nodes */
233 graph_node_map_element_t src_elm =
234 graph_node_map_search(as, *src_id);
235 graph_node_map_element_t dst_elm =
236 graph_node_map_search(as, *dst_id);
238 src_node_id = ((graph_node_data_t)
239 xbt_graph_node_get_data(src_elm->node))->graph_id;
240 dst_node_id = ((graph_node_data_t)
241 xbt_graph_node_get_data(dst_elm->node))->graph_id;
243 /* if the src and dst are the same */
244 if (src_node_id == dst_node_id) {
246 xbt_node_t node_s_v = xbt_dynar_get_as(nodes, src_node_id, xbt_node_t);
247 xbt_node_t node_e_v = xbt_dynar_get_as(nodes, dst_node_id, xbt_node_t);
249 xbt_graph_get_edge(as->route_graph, node_s_v, node_e_v);
252 THROWF(arg_error,0,"No route from '%s' to '%s'",src,dst);
254 e_route = (route_t) xbt_graph_edge_get_data(edge);
256 links = e_route->link_list;
257 xbt_dynar_foreach(links, cpt, link) {
258 xbt_dynar_unshift(route->link_list, &link);
264 /*check if there is a cached predecessor list avail */
265 elm = (route_cache_element_t)
266 xbt_dict_get_or_null_ext(as->route_cache, (char *) (&src_id),
270 if (elm) { /* cached mode and cache hit */
271 pred_arr = elm->pred_arr;
272 } else { /* not cached mode or cache miss */
273 double *cost_arr = NULL;
274 xbt_heap_t pqueue = NULL;
277 int nr_nodes = xbt_dynar_length(nodes);
278 cost_arr = xbt_new0(double, nr_nodes); /* link cost from src to other hosts */
279 pred_arr = xbt_new0(int, nr_nodes); /* predecessors in path from src */
280 pqueue = xbt_heap_new(nr_nodes, xbt_free);
283 cost_arr[src_node_id] = 0.0;
285 for (i = 0; i < nr_nodes; i++) {
286 if (i != src_node_id) {
287 cost_arr[i] = DBL_MAX;
292 /* initialize priority queue */
293 nodeid = xbt_new0(int, 1);
295 xbt_heap_push(pqueue, nodeid, cost_arr[i]);
299 /* apply dijkstra using the indexes from the graph's node array */
300 while (xbt_heap_size(pqueue) > 0) {
301 int *v_id = xbt_heap_pop(pqueue);
302 xbt_node_t v_node = xbt_dynar_get_as(nodes, *v_id, xbt_node_t);
303 xbt_dynar_t out_edges = xbt_graph_node_get_outedges(v_node);
304 xbt_edge_t edge = NULL;
307 xbt_dynar_foreach(out_edges, cursor, edge) {
308 xbt_node_t u_node = xbt_graph_edge_get_target(edge);
309 graph_node_data_t data = xbt_graph_node_get_data(u_node);
310 int u_id = data->graph_id;
311 route_t tmp_e_route = (route_t) xbt_graph_edge_get_data(edge);
312 int cost_v_u = (tmp_e_route->link_list)->used; /* count of links, old model assume 1 */
314 if (cost_v_u + cost_arr[*v_id] < cost_arr[u_id]) {
315 pred_arr[u_id] = *v_id;
316 cost_arr[u_id] = cost_v_u + cost_arr[*v_id];
317 nodeid = xbt_new0(int, 1);
319 xbt_heap_push(pqueue, nodeid, cost_arr[u_id]);
323 /* free item popped from pqueue */
328 xbt_heap_free(pqueue);
331 /* compose route path with links */
332 char *gw_src = NULL, *gw_dst = NULL, *prev_gw_src, *first_gw = NULL;
334 for (v = dst_node_id; v != src_node_id; v = pred_arr[v]) {
335 xbt_node_t node_pred_v =
336 xbt_dynar_get_as(nodes, pred_arr[v], xbt_node_t);
337 xbt_node_t node_v = xbt_dynar_get_as(nodes, v, xbt_node_t);
339 xbt_graph_get_edge(as->route_graph, node_pred_v, node_v);
342 THROWF(arg_error,0,"No route from '%s' to '%s'",src,dst);
344 prev_gw_src = gw_src;
346 e_route = (route_t) xbt_graph_edge_get_data(edge);
347 gw_src = e_route->src_gateway;
348 gw_dst = e_route->dst_gateway;
350 if (v == dst_node_id)
353 if (asg->hierarchy == SURF_ROUTING_RECURSIVE && v != dst_node_id
354 && strcmp(gw_dst, prev_gw_src)) {
355 xbt_dynar_t e_route_as_to_as=NULL;
356 routing_get_route_and_latency(gw_dst, prev_gw_src,&e_route_as_to_as,NULL);
358 THROWF(arg_error,0,"No route from '%s' to '%s'",src,dst);
359 links = e_route_as_to_as;
361 xbt_dynar_foreach(links, cpt, link) {
362 xbt_dynar_insert_at(route->link_list, pos, &link);
367 links = e_route->link_list;
368 xbt_dynar_foreach(links, cpt, link) {
369 xbt_dynar_unshift(route->link_list, &link);
374 if (asg->hierarchy == SURF_ROUTING_RECURSIVE) {
375 route->src_gateway = xbt_strdup(gw_src);
376 route->dst_gateway = xbt_strdup(first_gw);
379 if (as->cached && elm == NULL) {
380 /* add to predecessor list of the current src-host to cache */
381 elm = xbt_new0(struct route_cache_element, 1);
382 elm->pred_arr = pred_arr;
384 xbt_dict_set_ext(as->route_cache, (char *) (&src_id), sizeof(int),
385 (xbt_set_elm_t) elm, &route_cache_elem_free);
392 static void dijkstra_finalize(AS_t asg)
394 as_dijkstra_t as = (as_dijkstra_t) asg;
396 xbt_graph_free_graph(as->route_graph, &xbt_free,
397 &graph_edge_data_free, &xbt_free);
398 xbt_dict_free(&as->graph_node_map);
400 xbt_dict_free(&as->route_cache);
402 model_generic_finalize(asg);
405 /* Creation routing model functions */
407 AS_t model_dijkstra_both_create(int cached)
409 as_dijkstra_t new_component = (as_dijkstra_t)
410 model_generic_create_sized(sizeof(s_as_dijkstra_t));
412 new_component->generic_routing.parse_route = model_dijkstra_both_parse_route;
413 new_component->generic_routing.parse_ASroute = model_dijkstra_both_parse_route;
414 new_component->generic_routing.get_route = dijkstra_get_route;
415 new_component->generic_routing.get_onelink_routes =
416 dijkstra_get_onelink_routes;
417 new_component->generic_routing.finalize = dijkstra_finalize;
418 new_component->cached = cached;
420 return (AS_t)new_component;
423 AS_t model_dijkstra_create(void)
425 return model_dijkstra_both_create(0);
428 AS_t model_dijkstracache_create(void)
430 return model_dijkstra_both_create(1);
433 void model_dijkstra_both_end(AS_t as)
435 as_dijkstra_t THIS = (as_dijkstra_t) as;
437 xbt_node_t node = NULL;
438 unsigned int cursor2;
439 xbt_dynar_t nodes = NULL;
441 /* Create the topology graph */
442 if(!THIS->route_graph)
443 THIS->route_graph = xbt_graph_new_graph(1, NULL);
444 if(!THIS->graph_node_map)
445 THIS->graph_node_map = xbt_dict_new();
447 if (THIS->cached && !THIS->route_cache)
448 THIS->route_cache = xbt_dict_new();
450 /* Add the loopback if needed */
451 if (as->hierarchy == SURF_ROUTING_BASE)
452 add_loopback_dijkstra(THIS);
454 /* initialize graph indexes in nodes after graph has been built */
455 nodes = xbt_graph_get_nodes(THIS->route_graph);
457 xbt_dynar_foreach(nodes, cursor2, node) {
458 graph_node_data_t data = xbt_graph_node_get_data(node);
459 data->graph_id = cursor2;
463 void model_dijkstra_both_parse_route (AS_t asg, const char *src,
464 const char *dst, route_t route)
466 as_dijkstra_t as = (as_dijkstra_t) asg;
467 int *src_id, *dst_id;
468 src_id = xbt_dict_get_or_null(asg->to_index, src);
469 dst_id = xbt_dict_get_or_null(asg->to_index, dst);
471 xbt_assert(src_id, "Network elements %s not found", src);
472 xbt_assert(dst_id, "Network elements %s not found", dst);
474 /* Create the topology graph */
476 as->route_graph = xbt_graph_new_graph(1, NULL);
477 if(!as->graph_node_map)
478 as->graph_node_map = xbt_dict_new();
480 if (as->cached && !as->route_cache)
481 as->route_cache = xbt_dict_new();
483 if( A_surfxml_route_symmetrical == A_surfxml_route_symmetrical_YES
484 || A_surfxml_ASroute_symmetrical == A_surfxml_ASroute_symmetrical_YES )
485 xbt_die("Route symmetrical not supported on model dijkstra");
487 if(!route->dst_gateway && !route->src_gateway)
488 XBT_DEBUG("Load Route from \"%s\" to \"%s\"", src, dst);
490 XBT_DEBUG("Load ASroute from \"%s(%s)\" to \"%s(%s)\"", src,
491 route->src_gateway, dst, route->dst_gateway);
492 if(routing_get_network_element_type((const char*)route->dst_gateway) == SURF_NETWORK_ELEMENT_NULL)
493 xbt_die("The dst_gateway '%s' does not exist!",route->dst_gateway);
494 if(routing_get_network_element_type((const char*)route->src_gateway) == SURF_NETWORK_ELEMENT_NULL)
495 xbt_die("The src_gateway '%s' does not exist!",route->src_gateway);
498 route_t e_route = generic_new_extended_route(asg->hierarchy, route, 1);
499 route_new_dijkstra(as, *src_id, *dst_id, e_route);