1 /* Copyright (c) 2009-2018. 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 "simgrid/kernel/routing/DijkstraZone.hpp"
7 #include "simgrid/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 delete static_cast<graph_node_data_t>(n);
23 static void graph_edge_data_free(void* e)
25 delete static_cast<RouteCreationArgs*>(e);
28 /* Utility functions */
33 void DijkstraZone::seal()
36 xbt_node_t node = nullptr;
38 /* Create the topology graph */
40 routeGraph_ = xbt_graph_new_graph(1, nullptr);
42 /* Add the loopback if needed */
43 if (surf_network_model->loopback_ && hierarchy_ == RoutingMode::base) {
44 xbt_dynar_foreach (xbt_graph_get_nodes(routeGraph_), cursor, node) {
47 xbt_edge_t edge = nullptr;
49 xbt_dynar_foreach (xbt_graph_node_get_outedges(node), cursor2, edge) {
50 if (xbt_graph_edge_get_target(edge) == node) {
57 RouteCreationArgs* e_route = new RouteCreationArgs();
58 e_route->link_list.push_back(surf_network_model->loopback_);
59 xbt_graph_new_edge(routeGraph_, node, node, e_route);
64 /* initialize graph indexes in nodes after graph has been built */
65 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
67 xbt_dynar_foreach (nodes, cursor, node) {
68 graph_node_data_t data = static_cast<graph_node_data_t>(xbt_graph_node_get_data(node));
69 data->graph_id = cursor;
73 xbt_node_t DijkstraZone::routeGraphNewNode(int id, int graph_id)
75 graph_node_data_t data = new s_graph_node_data_t;
77 data->graph_id = graph_id;
79 xbt_node_t node = xbt_graph_new_node(routeGraph_, data);
80 graphNodeMap_.emplace(id, node);
85 xbt_node_t DijkstraZone::nodeMapSearch(int id)
87 auto ret = graphNodeMap_.find(id);
88 return ret == graphNodeMap_.end() ? nullptr : ret->second;
93 void DijkstraZone::newRoute(int src_id, int dst_id, RouteCreationArgs* e_route)
95 XBT_DEBUG("Load Route from \"%d\" to \"%d\"", src_id, dst_id);
96 xbt_node_t src = nullptr;
97 xbt_node_t dst = nullptr;
99 xbt_node_t src_elm = nodeMapSearch(src_id);
100 xbt_node_t dst_elm = nodeMapSearch(dst_id);
108 /* add nodes if they don't exist in the graph */
109 if (src_id == dst_id && src == nullptr && dst == nullptr) {
110 src = this->routeGraphNewNode(src_id, -1);
113 if (src == nullptr) {
114 src = this->routeGraphNewNode(src_id, -1);
116 if (dst == nullptr) {
117 dst = this->routeGraphNewNode(dst_id, -1);
121 /* add link as edge to graph */
122 xbt_graph_new_edge(routeGraph_, src, dst, e_route);
125 void DijkstraZone::getLocalRoute(NetPoint* src, NetPoint* dst, RouteCreationArgs* route, double* lat)
127 getRouteCheckParams(src, dst);
128 int src_id = src->id();
129 int dst_id = dst->id();
131 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
133 /* Use the graph_node id mapping set to quickly find the nodes */
134 xbt_node_t src_elm = nodeMapSearch(src_id);
135 xbt_node_t dst_elm = nodeMapSearch(dst_id);
137 int src_node_id = static_cast<graph_node_data_t>(xbt_graph_node_get_data(src_elm))->graph_id;
138 int dst_node_id = static_cast<graph_node_data_t>(xbt_graph_node_get_data(dst_elm))->graph_id;
140 /* if the src and dst are the same */
141 if (src_node_id == dst_node_id) {
143 xbt_node_t node_s_v = xbt_dynar_get_as(nodes, src_node_id, xbt_node_t);
144 xbt_node_t node_e_v = xbt_dynar_get_as(nodes, dst_node_id, xbt_node_t);
145 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_s_v, node_e_v);
148 THROWF(arg_error, 0, "No route from '%s' to '%s'", src->getCname(), dst->getCname());
150 RouteCreationArgs* e_route = static_cast<RouteCreationArgs*>(xbt_graph_edge_get_data(edge));
152 for (auto const& link : e_route->link_list) {
153 route->link_list.insert(route->link_list.begin(), link);
155 *lat += static_cast<surf::LinkImpl*>(link)->latency();
159 auto elm = routeCache_.emplace(src_id, std::vector<int>());
160 std::vector<int>& pred_arr = elm.first->second;
162 if (elm.second) { /* new element was inserted (not cached mode, or cache miss) */
163 int nr_nodes = xbt_dynar_length(nodes);
164 std::vector<double> cost_arr(nr_nodes); /* link cost from src to other hosts */
165 pred_arr.resize(nr_nodes); /* predecessors in path from src */
166 typedef std::pair<double, int> Qelt;
167 std::priority_queue<Qelt, std::vector<Qelt>, std::greater<Qelt>> pqueue;
170 cost_arr[src_node_id] = 0.0;
172 for (int i = 0; i < nr_nodes; i++) {
173 if (i != src_node_id) {
174 cost_arr[i] = DBL_MAX;
179 /* initialize priority queue */
180 pqueue.emplace(cost_arr[i], i);
183 /* apply dijkstra using the indexes from the graph's node array */
184 while (not pqueue.empty()) {
185 int v_id = pqueue.top().second;
187 xbt_node_t v_node = xbt_dynar_get_as(nodes, v_id, xbt_node_t);
188 xbt_edge_t edge = nullptr;
191 xbt_dynar_foreach (xbt_graph_node_get_outedges(v_node), cursor, edge) {
192 xbt_node_t u_node = xbt_graph_edge_get_target(edge);
193 graph_node_data_t data = static_cast<graph_node_data_t>(xbt_graph_node_get_data(u_node));
194 int u_id = data->graph_id;
195 RouteCreationArgs* tmp_e_route = static_cast<RouteCreationArgs*>(xbt_graph_edge_get_data(edge));
196 int cost_v_u = tmp_e_route->link_list.size(); /* count of links, old model assume 1 */
198 if (cost_v_u + cost_arr[v_id] < cost_arr[u_id]) {
199 pred_arr[u_id] = v_id;
200 cost_arr[u_id] = cost_v_u + cost_arr[v_id];
201 pqueue.emplace(cost_arr[u_id], u_id);
207 /* compose route path with links */
208 NetPoint* gw_src = nullptr;
210 NetPoint* first_gw = nullptr;
212 for (int v = dst_node_id; v != src_node_id; v = pred_arr[v]) {
213 xbt_node_t node_pred_v = xbt_dynar_get_as(nodes, pred_arr[v], xbt_node_t);
214 xbt_node_t node_v = xbt_dynar_get_as(nodes, v, xbt_node_t);
215 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_pred_v, node_v);
218 THROWF(arg_error, 0, "No route from '%s' to '%s'", src->getCname(), dst->getCname());
220 RouteCreationArgs* e_route = static_cast<RouteCreationArgs*>(xbt_graph_edge_get_data(edge));
222 NetPoint* prev_gw_src = gw_src;
223 gw_src = e_route->gw_src;
224 gw_dst = e_route->gw_dst;
226 if (v == dst_node_id)
229 if (hierarchy_ == RoutingMode::recursive && v != dst_node_id && gw_dst->getName() != prev_gw_src->getName()) {
230 std::vector<surf::LinkImpl*> e_route_as_to_as;
232 NetPoint* gw_dst_net_elm = nullptr;
233 NetPoint* prev_gw_src_net_elm = nullptr;
234 getGlobalRoute(gw_dst_net_elm, prev_gw_src_net_elm, e_route_as_to_as, nullptr);
235 auto pos = route->link_list.begin();
236 for (auto const& link : e_route_as_to_as) {
237 route->link_list.insert(pos, link);
239 *lat += link->latency();
244 for (auto const& link : e_route->link_list) {
245 route->link_list.insert(route->link_list.begin(), link);
247 *lat += static_cast<surf::LinkImpl*>(link)->latency();
251 if (hierarchy_ == RoutingMode::recursive) {
252 route->gw_src = gw_src;
253 route->gw_dst = first_gw;
260 DijkstraZone::~DijkstraZone()
262 xbt_graph_free_graph(routeGraph_, &graph_node_data_free, &graph_edge_data_free, nullptr);
265 /* Creation routing model functions */
267 DijkstraZone::DijkstraZone(NetZone* father, std::string name, bool cached) : RoutedZone(father, name), cached_(cached)
271 void DijkstraZone::addRoute(kernel::routing::NetPoint* src, kernel::routing::NetPoint* dst,
272 kernel::routing::NetPoint* gw_src, kernel::routing::NetPoint* gw_dst,
273 std::vector<simgrid::surf::LinkImpl*>& link_list, bool symmetrical)
275 const char* srcName = src->getCname();
276 const char* dstName = dst->getCname();
278 addRouteCheckParams(src, dst, gw_src, gw_dst, link_list, symmetrical);
280 /* Create the topology graph */
282 routeGraph_ = xbt_graph_new_graph(1, nullptr);
284 /* we don't check whether the route already exist, because the algorithm may find another path through some other
287 /* Add the route to the base */
288 RouteCreationArgs* e_route = newExtendedRoute(hierarchy_, src, dst, gw_src, gw_dst, link_list, symmetrical, 1);
289 newRoute(src->id(), dst->id(), e_route);
292 if (symmetrical == true) {
294 xbt_dynar_t nodes = xbt_graph_get_nodes(routeGraph_);
295 xbt_node_t node_s_v = xbt_dynar_get_as(nodes, src->id(), xbt_node_t);
296 xbt_node_t node_e_v = xbt_dynar_get_as(nodes, dst->id(), xbt_node_t);
297 xbt_edge_t edge = xbt_graph_get_edge(routeGraph_, node_e_v, node_s_v);
299 if (not gw_dst || not gw_src) {
300 XBT_DEBUG("Load Route from \"%s\" to \"%s\"", dstName, srcName);
302 THROWF(arg_error, 0, "Route from %s to %s already exists", dstName, srcName);
304 XBT_DEBUG("Load NetzoneRoute from %s@%s to %s@%s", dstName, gw_dst->getCname(), srcName, gw_src->getCname());
306 THROWF(arg_error, 0, "Route from %s@%s to %s@%s already exists", dstName, gw_dst->getCname(), srcName,
310 if (gw_dst && gw_src) {
311 NetPoint* gw_tmp = gw_src;
315 RouteCreationArgs* link_route_back =
316 newExtendedRoute(hierarchy_, src, dst, gw_src, gw_dst, link_list, symmetrical, 0);
317 newRoute(dst->id(), src->id(), link_route_back);