1 /* Copyright (c) 2009-2017. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "src/kernel/routing/DijkstraZone.hpp"
7 #include "src/kernel/routing/NetPoint.hpp"
8 #include "src/surf/network_interface.hpp"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_dijkstra, surf, "Routing part of surf -- dijkstra routing logic");
18 static void graph_node_data_free(void* n)
20 graph_node_data_t data = static_cast<graph_node_data_t>(n);
24 static void graph_edge_data_free(void* e)
26 sg_platf_route_cbarg_t e_route = static_cast<sg_platf_route_cbarg_t>(e);
30 /* Utility functions */
35 void DijkstraZone::seal()
38 xbt_node_t node = nullptr;
40 /* Create the topology graph */
42 routeGraph_ = xbt_graph_new_graph(1, nullptr);
44 /* Add the loopback if needed */
45 if (surf_network_model->loopback_ && hierarchy_ == RoutingMode::base) {
46 xbt_dynar_foreach (xbt_graph_get_nodes(routeGraph_), cursor, node) {
49 xbt_edge_t edge = nullptr;
51 xbt_dynar_foreach (xbt_graph_node_get_outedges(node), cursor2, edge) {
52 if (xbt_graph_edge_get_target(edge) == node) {
59 sg_platf_route_cbarg_t e_route = new s_sg_platf_route_cbarg_t;
60 e_route->link_list.push_back(surf_network_model->loopback_);
61 xbt_graph_new_edge(routeGraph_, node, node, e_route);
66 /* initialize graph indexes in nodes after graph has been built */
67 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
69 xbt_dynar_foreach (nodes, cursor, node) {
70 graph_node_data_t data = static_cast<graph_node_data_t>(xbt_graph_node_get_data(node));
71 data->graph_id = cursor;
75 xbt_node_t DijkstraZone::routeGraphNewNode(int id, int graph_id)
77 graph_node_data_t data = new s_graph_node_data_t;
79 data->graph_id = graph_id;
81 xbt_node_t node = xbt_graph_new_node(routeGraph_, data);
82 graphNodeMap_.emplace(id, node);
87 xbt_node_t DijkstraZone::nodeMapSearch(int id)
89 auto ret = graphNodeMap_.find(id);
90 return ret == graphNodeMap_.end() ? nullptr : ret->second;
95 void DijkstraZone::newRoute(int src_id, int dst_id, sg_platf_route_cbarg_t e_route)
97 XBT_DEBUG("Load Route from \"%d\" to \"%d\"", src_id, dst_id);
98 xbt_node_t src = nullptr;
99 xbt_node_t dst = nullptr;
101 xbt_node_t src_elm = nodeMapSearch(src_id);
102 xbt_node_t dst_elm = nodeMapSearch(dst_id);
110 /* add nodes if they don't exist in the graph */
111 if (src_id == dst_id && src == nullptr && dst == nullptr) {
112 src = this->routeGraphNewNode(src_id, -1);
115 if (src == nullptr) {
116 src = this->routeGraphNewNode(src_id, -1);
118 if (dst == nullptr) {
119 dst = this->routeGraphNewNode(dst_id, -1);
123 /* add link as edge to graph */
124 xbt_graph_new_edge(routeGraph_, src, dst, e_route);
127 void DijkstraZone::getLocalRoute(NetPoint* src, NetPoint* dst, sg_platf_route_cbarg_t route, double* lat)
129 getRouteCheckParams(src, dst);
130 int src_id = src->id();
131 int dst_id = dst->id();
133 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
135 /* Use the graph_node id mapping set to quickly find the nodes */
136 xbt_node_t src_elm = nodeMapSearch(src_id);
137 xbt_node_t dst_elm = nodeMapSearch(dst_id);
139 int src_node_id = static_cast<graph_node_data_t>(xbt_graph_node_get_data(src_elm))->graph_id;
140 int dst_node_id = static_cast<graph_node_data_t>(xbt_graph_node_get_data(dst_elm))->graph_id;
142 /* if the src and dst are the same */
143 if (src_node_id == dst_node_id) {
145 xbt_node_t node_s_v = xbt_dynar_get_as(nodes, src_node_id, xbt_node_t);
146 xbt_node_t node_e_v = xbt_dynar_get_as(nodes, dst_node_id, xbt_node_t);
147 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_s_v, node_e_v);
150 THROWF(arg_error, 0, "No route from '%s' to '%s'", src->getCname(), dst->getCname());
152 sg_platf_route_cbarg_t e_route = static_cast<sg_platf_route_cbarg_t>(xbt_graph_edge_get_data(edge));
154 for (auto const& link : e_route->link_list) {
155 route->link_list.insert(route->link_list.begin(), link);
157 *lat += static_cast<surf::LinkImpl*>(link)->latency();
161 auto elm = routeCache_.emplace(src_id, std::vector<int>());
162 std::vector<int>& pred_arr = elm.first->second;
164 if (elm.second) { /* new element was inserted (not cached mode, or cache miss) */
165 int nr_nodes = xbt_dynar_length(nodes);
166 std::vector<double> cost_arr(nr_nodes); /* link cost from src to other hosts */
167 pred_arr.resize(nr_nodes); /* predecessors in path from src */
168 typedef std::pair<double, int> Qelt;
169 std::priority_queue<Qelt, std::vector<Qelt>, std::greater<Qelt>> pqueue;
172 cost_arr[src_node_id] = 0.0;
174 for (int i = 0; i < nr_nodes; i++) {
175 if (i != src_node_id) {
176 cost_arr[i] = DBL_MAX;
181 /* initialize priority queue */
182 pqueue.emplace(cost_arr[i], i);
185 /* apply dijkstra using the indexes from the graph's node array */
186 while (not pqueue.empty()) {
187 int v_id = pqueue.top().second;
189 xbt_node_t v_node = xbt_dynar_get_as(nodes, v_id, xbt_node_t);
190 xbt_edge_t edge = nullptr;
193 xbt_dynar_foreach (xbt_graph_node_get_outedges(v_node), cursor, edge) {
194 xbt_node_t u_node = xbt_graph_edge_get_target(edge);
195 graph_node_data_t data = static_cast<graph_node_data_t>(xbt_graph_node_get_data(u_node));
196 int u_id = data->graph_id;
197 sg_platf_route_cbarg_t tmp_e_route = static_cast<sg_platf_route_cbarg_t>(xbt_graph_edge_get_data(edge));
198 int cost_v_u = tmp_e_route->link_list.size(); /* count of links, old model assume 1 */
200 if (cost_v_u + cost_arr[v_id] < cost_arr[u_id]) {
201 pred_arr[u_id] = v_id;
202 cost_arr[u_id] = cost_v_u + cost_arr[v_id];
203 pqueue.emplace(cost_arr[u_id], u_id);
209 /* compose route path with links */
210 NetPoint* gw_src = nullptr;
212 NetPoint* first_gw = nullptr;
214 for (int v = dst_node_id; v != src_node_id; v = pred_arr[v]) {
215 xbt_node_t node_pred_v = xbt_dynar_get_as(nodes, pred_arr[v], xbt_node_t);
216 xbt_node_t node_v = xbt_dynar_get_as(nodes, v, xbt_node_t);
217 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_pred_v, node_v);
220 THROWF(arg_error, 0, "No route from '%s' to '%s'", src->getCname(), dst->getCname());
222 sg_platf_route_cbarg_t e_route = static_cast<sg_platf_route_cbarg_t>(xbt_graph_edge_get_data(edge));
224 NetPoint* prev_gw_src = gw_src;
225 gw_src = e_route->gw_src;
226 gw_dst = e_route->gw_dst;
228 if (v == dst_node_id)
231 if (hierarchy_ == RoutingMode::recursive && v != dst_node_id && gw_dst->getName() != prev_gw_src->getName()) {
232 std::vector<surf::LinkImpl*> e_route_as_to_as;
234 NetPoint* gw_dst_net_elm = nullptr;
235 NetPoint* prev_gw_src_net_elm = nullptr;
236 getGlobalRoute(gw_dst_net_elm, prev_gw_src_net_elm, e_route_as_to_as, nullptr);
237 auto pos = route->link_list.begin();
238 for (auto const& link : e_route_as_to_as) {
239 route->link_list.insert(pos, link);
241 *lat += link->latency();
246 for (auto const& link : e_route->link_list) {
247 route->link_list.insert(route->link_list.begin(), link);
249 *lat += static_cast<surf::LinkImpl*>(link)->latency();
253 if (hierarchy_ == RoutingMode::recursive) {
254 route->gw_src = gw_src;
255 route->gw_dst = first_gw;
262 DijkstraZone::~DijkstraZone()
264 xbt_graph_free_graph(routeGraph_, &graph_node_data_free, &graph_edge_data_free, nullptr);
267 /* Creation routing model functions */
269 DijkstraZone::DijkstraZone(NetZone* father, std::string name, bool cached) : RoutedZone(father, name), cached_(cached)
273 void DijkstraZone::addRoute(sg_platf_route_cbarg_t route)
275 NetPoint* src = route->src;
276 NetPoint* dst = route->dst;
277 const char* srcName = src->getCname();
278 const char* dstName = dst->getCname();
280 addRouteCheckParams(route);
282 /* Create the topology graph */
284 routeGraph_ = xbt_graph_new_graph(1, nullptr);
286 /* we don't check whether the route already exist, because the algorithm may find another path through some other
289 /* Add the route to the base */
290 sg_platf_route_cbarg_t e_route = newExtendedRoute(hierarchy_, route, 1);
291 newRoute(src->id(), dst->id(), e_route);
294 if (route->symmetrical == true) {
296 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
297 xbt_node_t node_s_v = xbt_dynar_get_as(nodes, src->id(), xbt_node_t);
298 xbt_node_t node_e_v = xbt_dynar_get_as(nodes, dst->id(), xbt_node_t);
299 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_e_v, node_s_v);
301 if (not route->gw_dst || not route->gw_src){
302 XBT_DEBUG("Load Route from \"%s\" to \"%s\"", dstName, srcName);
304 THROWF(arg_error, 0, "Route from %s to %s already exists", dstName, srcName);
306 XBT_DEBUG("Load NetzoneRoute from %s@%s to %s@%s", dstName, route->gw_dst->getCname(), srcName,
307 route->gw_src->getCname());
309 THROWF(arg_error, 0, "Route from %s@%s to %s@%s already exists", dstName, route->gw_dst->getCname(), srcName,
310 route->gw_src->getCname());
313 if (route->gw_dst && route->gw_src) {
314 NetPoint* gw_tmp = route->gw_src;
315 route->gw_src = route->gw_dst;
316 route->gw_dst = gw_tmp;
318 sg_platf_route_cbarg_t link_route_back = newExtendedRoute(hierarchy_, route, 0);
319 newRoute(dst->id(), src->id(), link_route_back);