src/instr/instr_platform.cpp

   1 /* Copyright (c) 2010-2018. The SimGrid Team. All rights reserved.          */
   2
   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. */
   5
   6 #include "src/instr/instr_private.hpp"
   7
   8 #include "simgrid/kernel/routing/NetPoint.hpp"
   9 #include "simgrid/kernel/routing/NetZoneImpl.hpp"
  10 #include "simgrid/s4u/Actor.hpp"
  11 #include "simgrid/s4u/Engine.hpp"
  12 #include "simgrid/s4u/Exec.hpp"
  13 #include "simgrid/s4u/Host.hpp"
  14 #include "simgrid/s4u/VirtualMachine.hpp"
  15 #include "src/surf/cpu_interface.hpp"
  16 #include "src/surf/network_interface.hpp"
  17 #include "src/surf/surf_interface.hpp"
  18 #include "src/surf/xml/platf_private.hpp"
  19 #include "surf/surf.hpp"
  20 #include "xbt/graph.h"
  21
  22 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(instr_routing, instr, "Tracing platform hierarchy");
  23
  24 static std::vector<simgrid::instr::NetZoneContainer*> currentContainer; /* push and pop, used only in creation */
  25
  26 static const char* instr_node_name(xbt_node_t node)
  27 {
  28   return static_cast<char*>(xbt_graph_node_get_data(node));
  29 }
  30
  31 static container_t lowestCommonAncestor(container_t a1, container_t a2)
  32 {
  33   // this is only an optimization (since most of a1 and a2 share the same parent)
  34   if (a1->father_ == a2->father_)
  35     return a1->father_;
  36
  37   // create an array with all ancestors of a1
  38   std::vector<container_t> ancestors_a1;
  39   container_t p = a1->father_;
  40   while (p) {
  41     ancestors_a1.push_back(p);
  42     p = p->father_;
  43   }
  44
  45   // create an array with all ancestors of a2
  46   std::vector<container_t> ancestors_a2;
  47   p = a2->father_;
  48   while (p) {
  49     ancestors_a2.push_back(p);
  50     p = p->father_;
  51   }
  52
  53   // find the lowest ancestor
  54   p     = nullptr;
  55   int i = ancestors_a1.size() - 1;
  56   int j = ancestors_a2.size() - 1;
  57   while (i >= 0 && j >= 0) {
  58     container_t a1p = ancestors_a1.at(i);
  59     container_t a2p = ancestors_a2.at(j);
  60     if (a1p == a2p) {
  61       p = a1p;
  62     } else {
  63       break;
  64     }
  65     i--;
  66     j--;
  67   }
  68   return p;
  69 }
  70
  71 static void linkContainers(container_t src, container_t dst, std::set<std::string>* filter)
  72 {
  73   // ignore loopback
  74   if (src->get_name() == "__loopback__" || dst->get_name() == "__loopback__") {
  75     XBT_DEBUG("  linkContainers: ignoring loopback link");
  76     return;
  77   }
  78
  79   // find common father
  80   container_t father = lowestCommonAncestor(src, dst);
  81   if (not father) {
  82     xbt_die("common father unknown, this is a tracing problem");
  83   }
  84
  85   // check if we already register this pair (we only need one direction)
  86   std::string aux1 = src->get_name() + dst->get_name();
  87   std::string aux2 = dst->get_name() + src->get_name();
  88   if (filter->find(aux1) != filter->end()) {
  89     XBT_DEBUG("  linkContainers: already registered %s <-> %s (1)", src->get_cname(), dst->get_cname());
  90     return;
  91   }
  92   if (filter->find(aux2) != filter->end()) {
  93     XBT_DEBUG("  linkContainers: already registered %s <-> %s (2)", dst->get_cname(), src->get_cname());
  94     return;
  95   }
  96
  97   // ok, not found, register it
  98   filter->insert(aux1);
  99   filter->insert(aux2);
 100
 101   // declare type
 102   std::string link_typename = father->type_->get_name() + "-" + src->type_->get_name() +
 103                               std::to_string(src->type_->get_id()) + "-" + dst->type_->get_name() +
 104                               std::to_string(dst->type_->get_id());
 105   simgrid::instr::LinkType* link = father->type_->by_name_or_create(link_typename, src->type_, dst->type_);
 106   link->set_calling_container(father);
 107
 108   // register EDGE types for triva configuration
 109   trivaEdgeTypes.insert(link->get_name());
 110
 111   // create the link
 112   static long long counter = 0;
 113
 114   std::string key = std::to_string(counter);
 115   counter++;
 116
 117   link->start_event(src, "topology", key);
 118   link->end_event(dst, "topology", key);
 119
 120   XBT_DEBUG("  linkContainers %s <-> %s", src->get_cname(), dst->get_cname());
 121 }
 122
 123 static void recursiveGraphExtraction(simgrid::s4u::NetZone* netzone, container_t container,
 124                                      std::set<std::string>* filter)
 125 {
 126   if (not TRACE_platform_topology()) {
 127     XBT_DEBUG("Graph extraction disabled by user.");
 128     return;
 129   }
 130   XBT_DEBUG("Graph extraction for NetZone = %s", netzone->get_cname());
 131   if (not netzone->get_children().empty()) {
 132     // bottom-up recursion
 133     for (auto const& nz_son : netzone->get_children()) {
 134       container_t child_container = container->children_.at(nz_son->get_cname());
 135       recursiveGraphExtraction(nz_son, child_container, filter);
 136     }
 137   }
 138
 139   xbt_graph_t graph                        = xbt_graph_new_graph(0, nullptr);
 140   std::map<std::string, xbt_node_t>* nodes = new std::map<std::string, xbt_node_t>;
 141   std::map<std::string, xbt_edge_t>* edges = new std::map<std::string, xbt_edge_t>;
 142
 143   netzone->get_impl()->get_graph(graph, nodes, edges);
 144   for (auto elm : *edges) {
 145     xbt_edge_t edge = elm.second;
 146     linkContainers(simgrid::instr::Container::by_name(static_cast<const char*>(edge->src->data)),
 147                    simgrid::instr::Container::by_name(static_cast<const char*>(edge->dst->data)), filter);
 148   }
 149   delete nodes;
 150   delete edges;
 151   xbt_graph_free_graph(graph, xbt_free_f, xbt_free_f, nullptr);
 152 }
 153
 154 /*
 155  * Callbacks
 156  */
 157 static void instr_netzone_on_creation(simgrid::s4u::NetZone& netzone)
 158 {
 159   std::string id = netzone.get_name();
 160   if (simgrid::instr::Container::get_root() == nullptr) {
 161     simgrid::instr::NetZoneContainer* root = new simgrid::instr::NetZoneContainer(id, 0, nullptr);
 162
 163     if (TRACE_smpi_is_enabled()) {
 164       simgrid::instr::ContainerType* mpi = root->type_->by_name_or_create<simgrid::instr::ContainerType>("MPI");
 165       if (not TRACE_smpi_is_grouped())
 166         mpi->by_name_or_create<simgrid::instr::StateType>("MPI_STATE");
 167       root->type_->by_name_or_create("MPI_LINK", mpi, mpi);
 168       // TODO See if we can move this to the LoadBalancer plugin
 169       root->type_->by_name_or_create("MIGRATE_LINK", mpi, mpi);
 170       mpi->by_name_or_create<simgrid::instr::StateType>("MIGRATE_STATE");
 171     }
 172
 173     if (TRACE_needs_platform()) {
 174       currentContainer.push_back(root);
 175     }
 176     return;
 177   }
 178
 179   if (TRACE_needs_platform()) {
 180     simgrid::instr::NetZoneContainer* container =
 181         new simgrid::instr::NetZoneContainer(id, currentContainer.size(), currentContainer.back());
 182     currentContainer.push_back(container);
 183   }
 184 }
 185
 186 static void instr_link_on_creation(simgrid::s4u::Link& link)
 187 {
 188   if (currentContainer.empty()) // No ongoing parsing. Are you creating the loopback?
 189     return;
 190
 191   container_t container = new simgrid::instr::Container(link.get_name(), "LINK", currentContainer.back());
 192
 193   if ((TRACE_categorized() || TRACE_uncategorized() || TRACE_platform()) && (not TRACE_disable_link())) {
 194     simgrid::instr::VariableType* bandwidth = container->type_->by_name_or_create("bandwidth", "");
 195     bandwidth->set_calling_container(container);
 196     bandwidth->set_event(0, link.get_bandwidth());
 197     simgrid::instr::VariableType* latency = container->type_->by_name_or_create("latency", "");
 198     latency->set_calling_container(container);
 199     latency->set_event(0, link.get_latency());
 200   }
 201   if (TRACE_uncategorized()) {
 202     container->type_->by_name_or_create("bandwidth_used", "0.5 0.5 0.5");
 203   }
 204 }
 205
 206 static void instr_host_on_creation(simgrid::s4u::Host& host)
 207 {
 208   container_t container = new simgrid::instr::HostContainer(host, currentContainer.back());
 209   container_t root      = simgrid::instr::Container::get_root();
 210
 211   if ((TRACE_categorized() || TRACE_uncategorized() || TRACE_platform()) && (not TRACE_disable_speed())) {
 212     simgrid::instr::VariableType* speed = container->type_->by_name_or_create("speed", "");
 213     speed->set_calling_container(container);
 214     speed->set_event(0, host.get_speed());
 215
 216     simgrid::instr::VariableType* cores = container->type_->by_name_or_create("core_count", "");
 217     cores->set_calling_container(container);
 218     cores->set_event(0, host.get_core_count());
 219   }
 220
 221   if (TRACE_uncategorized())
 222     container->type_->by_name_or_create("speed_used", "0.5 0.5 0.5");
 223
 224   if (TRACE_smpi_is_enabled() && TRACE_smpi_is_grouped()) {
 225     simgrid::instr::ContainerType* mpi = container->type_->by_name_or_create<simgrid::instr::ContainerType>("MPI");
 226     mpi->by_name_or_create<simgrid::instr::StateType>("MPI_STATE");
 227     // TODO See if we can move this to the LoadBalancer plugin
 228     root->type_->by_name_or_create("MIGRATE_LINK", mpi, mpi);
 229     mpi->by_name_or_create<simgrid::instr::StateType>("MIGRATE_STATE");
 230   }
 231 }
 232
 233 static void instr_host_on_speed_change(simgrid::s4u::Host& host)
 234 {
 235   simgrid::instr::Container::by_name(host.get_cname())
 236       ->get_variable("speed")
 237       ->set_event(surf_get_clock(), host.get_core_count() * host.get_available_speed());
 238 }
 239
 240 static void instr_action_on_state_change(simgrid::kernel::resource::Action* action,
 241                                          simgrid::kernel::resource::Action::State /* previous */)
 242 {
 243   int n = action->get_variable()->get_number_of_constraint();
 244
 245   for (int i = 0; i < n; i++) {
 246     double value = action->get_variable()->get_value() * action->get_variable()->get_constraint_weight(i);
 247     /* Beware of composite actions: ptasks put links and cpus together. Extra pb: we cannot dynamic_cast from void* */
 248     simgrid::kernel::resource::Resource* resource =
 249         static_cast<simgrid::kernel::resource::Resource*>(action->get_variable()->get_constraint(i)->get_id());
 250     simgrid::surf::Cpu* cpu = dynamic_cast<simgrid::surf::Cpu*>(resource);
 251
 252     if (cpu != nullptr)
 253       TRACE_surf_resource_set_utilization("HOST", "speed_used", cpu->get_cname(), action->get_category(), value,
 254                                           action->get_last_update(), SIMIX_get_clock() - action->get_last_update());
 255
 256     simgrid::kernel::resource::LinkImpl* link = dynamic_cast<simgrid::kernel::resource::LinkImpl*>(resource);
 257
 258     if (link != nullptr)
 259       TRACE_surf_resource_set_utilization("LINK", "bandwidth_used", link->get_cname(), action->get_category(), value,
 260                                           action->get_last_update(), SIMIX_get_clock() - action->get_last_update());
 261   }
 262 }
 263
 264 static void instr_link_on_bandwidth_change(simgrid::s4u::Link& link)
 265 {
 266   simgrid::instr::Container::by_name(link.get_cname())
 267       ->get_variable("bandwidth")
 268       ->set_event(surf_get_clock(), sg_bandwidth_factor * link.get_bandwidth());
 269 }
 270
 271 static void instr_netpoint_on_creation(simgrid::kernel::routing::NetPoint* netpoint)
 272 {
 273   if (netpoint->is_router())
 274     new simgrid::instr::RouterContainer(netpoint->get_cname(), currentContainer.back());
 275 }
 276
 277 static void instr_on_platform_created()
 278 {
 279   currentContainer.clear();
 280   std::set<std::string>* filter = new std::set<std::string>;
 281   XBT_DEBUG("Starting graph extraction.");
 282   recursiveGraphExtraction(simgrid::s4u::Engine::get_instance()->get_netzone_root(),
 283                            simgrid::instr::Container::get_root(), filter);
 284   XBT_DEBUG("Graph extraction finished.");
 285   delete filter;
 286   TRACE_paje_dump_buffer(true);
 287 }
 288
 289 static void instr_actor_on_creation(simgrid::s4u::ActorPtr actor)
 290 {
 291   container_t root      = simgrid::instr::Container::get_root();
 292   container_t container = simgrid::instr::Container::by_name(actor->get_host()->get_name());
 293
 294   container->create_child(instr_pid(actor.get()), "ACTOR");
 295   simgrid::instr::ContainerType* actor_type =
 296       container->type_->by_name_or_create<simgrid::instr::ContainerType>("ACTOR");
 297   simgrid::instr::StateType* state = actor_type->by_name_or_create<simgrid::instr::StateType>("ACTOR_STATE");
 298   state->add_entity_value("suspend", "1 0 1");
 299   state->add_entity_value("sleep", "1 1 0");
 300   state->add_entity_value("receive", "1 0 0");
 301   state->add_entity_value("send", "0 0 1");
 302   state->add_entity_value("execute", "0 1 1");
 303   root->type_->by_name_or_create("ACTOR_LINK", actor_type, actor_type);
 304   root->type_->by_name_or_create("ACTOR_TASK_LINK", actor_type, actor_type);
 305
 306   std::string container_name = instr_pid(actor.get());
 307   actor->on_exit(
 308       [container_name](int status, void* actor) {
 309         if (status == SMX_EXIT_FAILURE)
 310           // kill means that this actor no longer exists, let's destroy it
 311           simgrid::instr::Container::by_name(container_name)->remove_from_parent();
 312       },
 313       actor->get_impl());
 314 }
 315
 316 static long long int counter = 0;
 317
 318 static void instr_actor_on_migration_start(simgrid::s4u::ActorPtr actor)
 319 {
 320   // start link
 321   container_t container = simgrid::instr::Container::by_name(instr_pid(actor.get()));
 322   simgrid::instr::Container::get_root()->get_link("ACTOR_LINK")->start_event(container, "M", std::to_string(counter));
 323
 324   // destroy existing container of this process
 325   container->remove_from_parent();
 326 }
 327
 328 static void instr_actor_on_migration_end(simgrid::s4u::ActorPtr actor)
 329 {
 330   // create new container on the new_host location
 331   simgrid::instr::Container::by_name(actor->get_host()->get_name())->create_child(instr_pid(actor.get()), "ACTOR");
 332   // end link
 333   simgrid::instr::Container::get_root()
 334       ->get_link("ACTOR_LINK")
 335       ->end_event(simgrid::instr::Container::by_name(instr_pid(actor.get())), "M", std::to_string(counter));
 336   counter++;
 337 }
 338
 339 static void instr_vm_on_creation(simgrid::s4u::Host& host)
 340 {
 341   container_t container             = new simgrid::instr::HostContainer(host, currentContainer.back());
 342   container_t root                  = simgrid::instr::Container::get_root();
 343   simgrid::instr::ContainerType* vm = container->type_->by_name_or_create<simgrid::instr::ContainerType>("VM");
 344   simgrid::instr::StateType* state  = vm->by_name_or_create<simgrid::instr::StateType>("VM_STATE");
 345   state->add_entity_value("suspend", "1 0 1");
 346   state->add_entity_value("sleep", "1 1 0");
 347   state->add_entity_value("receive", "1 0 0");
 348   state->add_entity_value("send", "0 0 1");
 349   state->add_entity_value("execute", "0 1 1");
 350   root->type_->by_name_or_create("VM_LINK", vm, vm);
 351   root->type_->by_name_or_create("VM_ACTOR_LINK", vm, vm);
 352 }
 353
 354 void instr_define_callbacks()
 355 {
 356   // always need the callbacks to zones (we need only the root zone), to create the rootContainer and the rootType
 357   // properly
 358   if (TRACE_needs_platform()) {
 359     simgrid::s4u::on_platform_created.connect(instr_on_platform_created);
 360     simgrid::s4u::Host::on_creation.connect(instr_host_on_creation);
 361     simgrid::s4u::Host::on_speed_change.connect(instr_host_on_speed_change);
 362     simgrid::s4u::Link::on_creation.connect(instr_link_on_creation);
 363     simgrid::s4u::Link::on_bandwidth_change.connect(instr_link_on_bandwidth_change);
 364     simgrid::s4u::NetZone::on_seal.connect([](simgrid::s4u::NetZone& /*netzone*/) { currentContainer.pop_back(); });
 365     simgrid::kernel::routing::NetPoint::on_creation.connect(instr_netpoint_on_creation);
 366   }
 367   simgrid::s4u::NetZone::on_creation.connect(instr_netzone_on_creation);
 368
 369   simgrid::surf::CpuAction::on_state_change.connect(instr_action_on_state_change);
 370   simgrid::s4u::Link::on_communication_state_change.connect(instr_action_on_state_change);
 371
 372   if (TRACE_actor_is_enabled()) {
 373     simgrid::s4u::Actor::on_creation.connect(instr_actor_on_creation);
 374     simgrid::s4u::Actor::on_suspend.connect([](simgrid::s4u::ActorPtr actor) {
 375       simgrid::instr::Container::by_name(instr_pid(actor.get()))->get_state("ACTOR_STATE")->push_event("suspend");
 376     });
 377     simgrid::s4u::Actor::on_resume.connect([](simgrid::s4u::ActorPtr actor) {
 378       simgrid::instr::Container::by_name(instr_pid(actor.get()))->get_state("ACTOR_STATE")->pop_event();
 379     });
 380     simgrid::s4u::Actor::on_sleep.connect([](simgrid::s4u::ActorPtr actor) {
 381       simgrid::instr::Container::by_name(instr_pid(actor.get()))->get_state("ACTOR_STATE")->push_event("sleep");
 382     });
 383     simgrid::s4u::Actor::on_wake_up.connect([](simgrid::s4u::ActorPtr actor) {
 384       simgrid::instr::Container::by_name(instr_pid(actor.get()))->get_state("ACTOR_STATE")->pop_event();
 385     });
 386     simgrid::s4u::Exec::on_start.connect([](simgrid::s4u::ActorPtr actor) {
 387       simgrid::instr::Container::by_name(instr_pid(actor.get()))->get_state("ACTOR_STATE")->push_event("execute");
 388     });
 389     simgrid::s4u::Exec::on_completion.connect([](simgrid::s4u::ActorPtr actor) {
 390       simgrid::instr::Container::by_name(instr_pid(actor.get()))->get_state("ACTOR_STATE")->pop_event();
 391     });
 392     simgrid::s4u::Actor::on_migration_start.connect(instr_actor_on_migration_start);
 393     simgrid::s4u::Actor::on_migration_end.connect(instr_actor_on_migration_end);
 394   }
 395
 396   if (TRACE_vm_is_enabled()) {
 397     simgrid::s4u::Host::on_creation.connect(instr_vm_on_creation);
 398     simgrid::s4u::VirtualMachine::on_start.connect([](simgrid::s4u::VirtualMachine& vm) {
 399       simgrid::instr::Container::by_name(vm.get_name())->get_state("VM_STATE")->push_event("start");
 400     });
 401     simgrid::s4u::VirtualMachine::on_started.connect([](simgrid::s4u::VirtualMachine& vm) {
 402       simgrid::instr::Container::by_name(vm.get_name())->get_state("VM_STATE")->pop_event();
 403     });
 404     simgrid::s4u::VirtualMachine::on_suspend.connect([](simgrid::s4u::VirtualMachine& vm) {
 405       simgrid::instr::Container::by_name(vm.get_name())->get_state("VM_STATE")->push_event("suspend");
 406     });
 407     simgrid::s4u::VirtualMachine::on_resume.connect([](simgrid::s4u::VirtualMachine& vm) {
 408       simgrid::instr::Container::by_name(vm.get_name())->get_state("VM_STATE")->pop_event();
 409     });
 410     simgrid::s4u::Host::on_destruction.connect(
 411         [](simgrid::s4u::Host& host) { simgrid::instr::Container::by_name(host.get_name())->remove_from_parent(); });
 412   }
 413 }
 414 /*
 415  * user categories support
 416  */
 417 static void recursiveNewVariableType(std::string new_typename, std::string color, simgrid::instr::Type* root)
 418 {
 419   if (root->get_name() == "HOST" || root->get_name() == "VM")
 420     root->by_name_or_create(std::string("p") + new_typename, color);
 421
 422   if (root->get_name() == "LINK")
 423     root->by_name_or_create(std::string("b") + new_typename, color);
 424
 425   for (auto elm : root->children_) {
 426     recursiveNewVariableType(new_typename, color, elm.second);
 427   }
 428 }
 429
 430 void instr_new_variable_type(std::string new_typename, std::string color)
 431 {
 432   recursiveNewVariableType(new_typename, color, simgrid::instr::Container::get_root()->type_);
 433 }
 434
 435 static void recursiveNewUserVariableType(std::string father_type, std::string new_typename, std::string color,
 436                                          simgrid::instr::Type* root)
 437 {
 438   if (root->get_name() == father_type) {
 439     root->by_name_or_create(new_typename, color);
 440   }
 441   for (auto elm : root->children_)
 442     recursiveNewUserVariableType(father_type, new_typename, color, elm.second);
 443 }
 444
 445 void instr_new_user_variable_type(std::string father_type, std::string new_typename, std::string color)
 446 {
 447   recursiveNewUserVariableType(father_type, new_typename, color, simgrid::instr::Container::get_root()->type_);
 448 }
 449
 450 static void recursiveNewUserStateType(std::string father_type, std::string new_typename, simgrid::instr::Type* root)
 451 {
 452   if (root->get_name() == father_type)
 453     root->by_name_or_create<simgrid::instr::StateType>(new_typename);
 454
 455   for (auto elm : root->children_)
 456     recursiveNewUserStateType(father_type, new_typename, elm.second);
 457 }
 458
 459 void instr_new_user_state_type(std::string father_type, std::string new_typename)
 460 {
 461   recursiveNewUserStateType(father_type, new_typename, simgrid::instr::Container::get_root()->type_);
 462 }
 463
 464 static void recursiveNewValueForUserStateType(std::string type_name, const char* val, std::string color,
 465                                               simgrid::instr::Type* root)
 466 {
 467   if (root->get_name() == type_name)
 468     static_cast<simgrid::instr::StateType*>(root)->add_entity_value(val, color);
 469
 470   for (auto elm : root->children_)
 471     recursiveNewValueForUserStateType(type_name, val, color, elm.second);
 472 }
 473
 474 void instr_new_value_for_user_state_type(std::string type_name, const char* value, std::string color)
 475 {
 476   recursiveNewValueForUserStateType(type_name, value, color, simgrid::instr::Container::get_root()->type_);
 477 }
 478
 479 #define GRAPHICATOR_SUPPORT_FUNCTIONS
 480
 481 static void recursiveXBTGraphExtraction(xbt_graph_t graph, std::map<std::string, xbt_node_t>* nodes,
 482                                         std::map<std::string, xbt_edge_t>* edges, sg_netzone_t netzone,
 483                                         container_t container)
 484 {
 485   if (not netzone->get_children().empty()) {
 486     // bottom-up recursion
 487     for (auto const& netzone_child : netzone->get_children()) {
 488       container_t child_container = container->children_.at(netzone_child->get_cname());
 489       recursiveXBTGraphExtraction(graph, nodes, edges, netzone_child, child_container);
 490     }
 491   }
 492
 493   netzone->get_impl()->get_graph(graph, nodes, edges);
 494 }
 495
 496 xbt_graph_t instr_routing_platform_graph()
 497 {
 498   xbt_graph_t ret                          = xbt_graph_new_graph(0, nullptr);
 499   std::map<std::string, xbt_node_t>* nodes = new std::map<std::string, xbt_node_t>;
 500   std::map<std::string, xbt_edge_t>* edges = new std::map<std::string, xbt_edge_t>;
 501   recursiveXBTGraphExtraction(ret, nodes, edges, simgrid::s4u::Engine::get_instance()->get_netzone_root(),
 502                               simgrid::instr::Container::get_root());
 503   delete nodes;
 504   delete edges;
 505   return ret;
 506 }
 507
 508 void instr_routing_platform_graph_export_graphviz(xbt_graph_t g, const char* filename)
 509 {
 510   unsigned int cursor = 0;
 511   xbt_node_t node     = nullptr;
 512   xbt_edge_t edge     = nullptr;
 513
 514   FILE* file = fopen(filename, "w");
 515   xbt_assert(file, "Failed to open %s \n", filename);
 516
 517   if (g->directed)
 518     fprintf(file, "digraph test {\n");
 519   else
 520     fprintf(file, "graph test {\n");
 521
 522   fprintf(file, "  graph [overlap=scale]\n");
 523
 524   fprintf(file, "  node [shape=box, style=filled]\n");
 525   fprintf(file, "  node [width=.3, height=.3, style=filled, color=skyblue]\n\n");
 526
 527   xbt_dynar_foreach (g->nodes, cursor, node) {
 528     fprintf(file, "  \"%s\";\n", instr_node_name(node));
 529   }
 530   xbt_dynar_foreach (g->edges, cursor, edge) {
 531     const char* src_s = instr_node_name(edge->src);
 532     const char* dst_s = instr_node_name(edge->dst);
 533     if (g->directed)
 534       fprintf(file, "  \"%s\" -> \"%s\";\n", src_s, dst_s);
 535     else
 536       fprintf(file, "  \"%s\" -- \"%s\";\n", src_s, dst_s);
 537   }
 538   fprintf(file, "}\n");
 539   fclose(file);
 540 }