1 /* Copyright (c) 2009-2021. 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"
9 #include "src/surf/xml/platf_private.hpp"
10 #include "surf/surf.hpp"
11 #include "xbt/string.hpp"
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_route_dijkstra, surf, "Routing part of surf -- dijkstra routing logic");
25 explicit GraphNodeData(int id) : id_(id) {}
27 int graph_id_ = -1; /* used for caching internal graph id's */
30 DijkstraZone::DijkstraZone(const std::string& name, bool cached) : RoutedZone(name), cached_(cached) {}
32 void DijkstraZone::route_graph_delete(xbt_graph_t g)
35 g, [](void* n) { delete static_cast<simgrid::kernel::routing::GraphNodeData*>(n); },
36 [](void* e) { delete static_cast<simgrid::kernel::routing::RouteCreationArgs*>(e); }, nullptr);
39 void DijkstraZone::do_seal()
42 xbt_node_t node = nullptr;
44 /* Add the loopback if needed */
45 if (get_network_model()->loopback_ && hierarchy_ == RoutingMode::base) {
46 xbt_dynar_foreach (xbt_graph_get_nodes(route_graph_.get()), cursor, node) {
48 xbt_edge_t edge = nullptr;
50 xbt_dynar_foreach (xbt_graph_node_get_outedges(node), cursor2, edge) {
51 if (xbt_graph_edge_get_target(edge) == node) { // There is an edge from node to itself
58 auto* route = new simgrid::kernel::routing::RouteCreationArgs();
59 route->link_list.push_back(get_network_model()->loopback_);
60 xbt_graph_new_edge(route_graph_.get(), node, node, route);
65 /* initialize graph indexes in nodes after graph has been built */
66 const_xbt_dynar_t nodes = xbt_graph_get_nodes(route_graph_.get());
68 xbt_dynar_foreach (nodes, cursor, node) {
69 auto* data = static_cast<GraphNodeData*>(xbt_graph_node_get_data(node));
70 data->graph_id_ = cursor;
74 xbt_node_t DijkstraZone::route_graph_new_node(int id)
76 xbt_node_t node = xbt_graph_new_node(route_graph_.get(), new GraphNodeData(id));
77 graph_node_map_.emplace(id, node);
82 xbt_node_t DijkstraZone::node_map_search(int id)
84 auto ret = graph_node_map_.find(id);
85 return ret == graph_node_map_.end() ? nullptr : ret->second;
90 void DijkstraZone::get_local_route(NetPoint* src, NetPoint* dst, RouteCreationArgs* route, double* lat)
92 get_route_check_params(src, dst);
93 int src_id = src->id();
94 int dst_id = dst->id();
96 const_xbt_dynar_t nodes = xbt_graph_get_nodes(route_graph_.get());
98 /* Use the graph_node id mapping set to quickly find the nodes */
99 const s_xbt_node_t* src_elm = node_map_search(src_id);
100 const s_xbt_node_t* dst_elm = node_map_search(dst_id);
102 int src_node_id = static_cast<GraphNodeData*>(xbt_graph_node_get_data(src_elm))->graph_id_;
103 int dst_node_id = static_cast<GraphNodeData*>(xbt_graph_node_get_data(dst_elm))->graph_id_;
105 /* if the src and dst are the same */
106 if (src_node_id == dst_node_id) {
107 const s_xbt_node_t* node_s_v = xbt_dynar_get_as(nodes, src_node_id, xbt_node_t);
108 const s_xbt_node_t* node_e_v = xbt_dynar_get_as(nodes, dst_node_id, xbt_node_t);
109 const s_xbt_edge_t* edge = xbt_graph_get_edge(route_graph_.get(), node_s_v, node_e_v);
112 throw std::invalid_argument(xbt::string_printf("No route from '%s' to '%s'", src->get_cname(), dst->get_cname()));
114 const RouteCreationArgs* e_route = static_cast<RouteCreationArgs*>(xbt_graph_edge_get_data(edge));
116 for (auto const& link : e_route->link_list) {
117 route->link_list.insert(route->link_list.begin(), link);
119 *lat += link->get_latency();
123 auto elm = route_cache_.emplace(src_id, std::vector<int>());
124 std::vector<int>& pred_arr = elm.first->second;
126 if (elm.second) { /* new element was inserted (not cached mode, or cache miss) */
127 int nr_nodes = xbt_dynar_length(nodes);
128 std::vector<double> cost_arr(nr_nodes); /* link cost from src to other hosts */
129 pred_arr.resize(nr_nodes); /* predecessors in path from src */
130 using Qelt = std::pair<double, int>;
131 std::priority_queue<Qelt, std::vector<Qelt>, std::greater<>> pqueue;
134 cost_arr[src_node_id] = 0.0;
136 for (int i = 0; i < nr_nodes; i++) {
137 if (i != src_node_id) {
138 cost_arr[i] = DBL_MAX;
143 /* initialize priority queue */
144 pqueue.emplace(cost_arr[i], i);
147 /* apply dijkstra using the indexes from the graph's node array */
148 while (not pqueue.empty()) {
149 int v_id = pqueue.top().second;
151 const s_xbt_node_t* v_node = xbt_dynar_get_as(nodes, v_id, xbt_node_t);
152 xbt_edge_t edge = nullptr;
155 xbt_dynar_foreach (xbt_graph_node_get_outedges(v_node), cursor, edge) {
156 const s_xbt_node_t* u_node = xbt_graph_edge_get_target(edge);
157 const GraphNodeData* data = static_cast<GraphNodeData*>(xbt_graph_node_get_data(u_node));
158 int u_id = data->graph_id_;
159 const RouteCreationArgs* tmp_e_route = static_cast<RouteCreationArgs*>(xbt_graph_edge_get_data(edge));
160 int cost_v_u = tmp_e_route->link_list.size(); /* count of links, old model assume 1 */
162 if (cost_v_u + cost_arr[v_id] < cost_arr[u_id]) {
163 pred_arr[u_id] = v_id;
164 cost_arr[u_id] = cost_v_u + cost_arr[v_id];
165 pqueue.emplace(cost_arr[u_id], u_id);
171 /* compose route path with links */
172 NetPoint* gw_src = nullptr;
173 NetPoint* first_gw = nullptr;
175 for (int v = dst_node_id; v != src_node_id; v = pred_arr[v]) {
176 const s_xbt_node_t* node_pred_v = xbt_dynar_get_as(nodes, pred_arr[v], xbt_node_t);
177 const s_xbt_node_t* node_v = xbt_dynar_get_as(nodes, v, xbt_node_t);
178 const s_xbt_edge_t* edge = xbt_graph_get_edge(route_graph_.get(), node_pred_v, node_v);
181 throw std::invalid_argument(xbt::string_printf("No route from '%s' to '%s'", src->get_cname(), dst->get_cname()));
183 const RouteCreationArgs* e_route = static_cast<RouteCreationArgs*>(xbt_graph_edge_get_data(edge));
185 const NetPoint* prev_gw_src = gw_src;
186 gw_src = e_route->gw_src;
187 NetPoint* gw_dst = e_route->gw_dst;
189 if (v == dst_node_id)
192 if (hierarchy_ == RoutingMode::recursive && v != dst_node_id && gw_dst->get_name() != prev_gw_src->get_name()) {
193 std::vector<resource::LinkImpl*> e_route_as_to_as;
195 NetPoint* gw_dst_net_elm = nullptr;
196 NetPoint* prev_gw_src_net_elm = nullptr;
197 get_global_route(gw_dst_net_elm, prev_gw_src_net_elm, e_route_as_to_as, nullptr);
198 auto pos = route->link_list.begin();
199 for (auto const& link : e_route_as_to_as) {
200 route->link_list.insert(pos, link);
202 *lat += link->get_latency();
207 for (auto const& link : e_route->link_list) {
208 route->link_list.insert(route->link_list.begin(), link);
210 *lat += link->get_latency();
214 if (hierarchy_ == RoutingMode::recursive) {
215 route->gw_src = gw_src;
216 route->gw_dst = first_gw;
220 route_cache_.clear();
223 void DijkstraZone::add_route(NetPoint* src, NetPoint* dst, NetPoint* gw_src, NetPoint* gw_dst,
224 std::vector<resource::LinkImpl*>& link_list, bool symmetrical)
226 add_route_check_params(src, dst, gw_src, gw_dst, link_list, symmetrical);
228 new_edge(src->id(), dst->id(), new_extended_route(hierarchy_, gw_src, gw_dst, link_list, true));
231 new_edge(dst->id(), src->id(), new_extended_route(hierarchy_, gw_dst, gw_src, link_list, false));
234 void DijkstraZone::new_edge(int src_id, int dst_id, RouteCreationArgs* route)
236 XBT_DEBUG("Create Route from '%d' to '%d'", src_id, dst_id);
238 // Get the extremities, or create them if they don't exist yet
239 xbt_node_t src = node_map_search(src_id);
241 src = route_graph_new_node(src_id);
243 xbt_node_t dst = node_map_search(dst_id);
245 dst = route_graph_new_node(dst_id);
247 // Make sure that this graph edge was not already added to the graph
248 if (xbt_graph_get_edge(route_graph_.get(), src, dst) != nullptr) {
249 if (route->gw_dst == nullptr || route->gw_src == nullptr)
250 throw std::invalid_argument(
251 xbt::string_printf("Route from %s to %s already exists", route->src->get_cname(), route->dst->get_cname()));
253 throw std::invalid_argument(xbt::string_printf("Route from %s@%s to %s@%s already exists",
254 route->src->get_cname(), route->gw_src->get_cname(),
255 route->dst->get_cname(), route->gw_dst->get_cname()));
259 xbt_graph_new_edge(route_graph_.get(), src, dst, route);
261 } // namespace routing
262 } // namespace kernel
263 } // namespace simgrid