src/surf/sg_platf.cpp

   1 /* Copyright (c) 2006-2017. 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 "simgrid/s4u/Engine.hpp"
   7 #include "simgrid/s4u/Storage.hpp"
   8
   9 #include "src/kernel/EngineImpl.hpp"
  10 #include "src/simix/smx_private.h"
  11
  12 #include "src/include/simgrid/sg_config.h"
  13
  14 #include "src/surf/HostImpl.hpp"
  15 #include "src/surf/cpu_interface.hpp"
  16 #include "src/surf/network_interface.hpp"
  17
  18 #include "src/kernel/routing/ClusterZone.hpp"
  19 #include "src/kernel/routing/DijkstraZone.hpp"
  20 #include "src/kernel/routing/DragonflyZone.hpp"
  21 #include "src/kernel/routing/EmptyZone.hpp"
  22 #include "src/kernel/routing/FatTreeZone.hpp"
  23 #include "src/kernel/routing/FloydZone.hpp"
  24 #include "src/kernel/routing/FullZone.hpp"
  25 #include "src/kernel/routing/NetPoint.hpp"
  26 #include "src/kernel/routing/NetZoneImpl.hpp"
  27 #include "src/kernel/routing/TorusZone.hpp"
  28 #include "src/kernel/routing/VivaldiZone.hpp"
  29 #include <string>
  30 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(surf_parse);
  31
  32 XBT_PRIVATE std::map<std::string, simgrid::surf::StorageImpl*> mount_list;
  33 XBT_PRIVATE std::vector<std::string> known_storages;
  34
  35 namespace simgrid {
  36 namespace surf {
  37
  38 simgrid::xbt::signal<void(sg_platf_cluster_cbarg_t)> on_cluster;
  39
  40 }
  41 }
  42
  43 // FIXME: The following duplicates the content of s4u::Host
  44 namespace simgrid {
  45 namespace s4u {
  46 extern std::map<std::string, simgrid::s4u::Host*> host_list;
  47 }
  48 }
  49
  50 static int surf_parse_models_setup_already_called = 0;
  51 std::map<std::string, storage_type_t> storage_types;
  52
  53 /** The current AS in the parsing */
  54 static simgrid::kernel::routing::NetZoneImpl* current_routing = nullptr;
  55 static simgrid::kernel::routing::NetZoneImpl* routing_get_current()
  56 {
  57   return current_routing;
  58 }
  59
  60 /** Module management function: creates all internal data structures */
  61 void sg_platf_init()
  62 { /* Do nothing: just for symmetry of user code */
  63 }
  64
  65 /** Module management function: frees all internal data structures */
  66 void sg_platf_exit() {
  67   simgrid::surf::on_cluster.disconnect_all_slots();
  68   simgrid::s4u::onPlatformCreated.disconnect_all_slots();
  69
  70   /* make sure that we will reinit the models while loading the platf once reinited */
  71   surf_parse_models_setup_already_called = 0;
  72   surf_parse_lex_destroy();
  73 }
  74
  75 /** @brief Add an host to the current AS */
  76 void sg_platf_new_host(sg_platf_host_cbarg_t args)
  77 {
  78   std::unordered_map<std::string, std::string> props;
  79   if (args->properties) {
  80     xbt_dict_cursor_t cursor=nullptr;
  81     char *key;
  82     char* data;
  83     xbt_dict_foreach (args->properties, cursor, key, data)
  84       props[key] = data;
  85     xbt_dict_free(&args->properties);
  86   }
  87
  88   simgrid::s4u::Host* host =
  89       routing_get_current()->createHost(args->id, &args->speed_per_pstate, args->core_amount, &props);
  90
  91   host->pimpl_->storage_ = mount_list;
  92   mount_list.clear();
  93
  94   /* Change from the defaults */
  95   if (args->state_trace)
  96     host->pimpl_cpu->setStateTrace(args->state_trace);
  97   if (args->speed_trace)
  98     host->pimpl_cpu->setSpeedTrace(args->speed_trace);
  99   if (args->pstate != 0)
 100     host->pimpl_cpu->setPState(args->pstate);
 101   if (args->coord && strcmp(args->coord, ""))
 102     new simgrid::kernel::routing::vivaldi::Coords(host->pimpl_netpoint, args->coord);
 103
 104 }
 105
 106 /** @brief Add a "router" to the network element list */
 107 simgrid::kernel::routing::NetPoint* sg_platf_new_router(const char* name, const char* coords)
 108 {
 109   simgrid::kernel::routing::NetZoneImpl* current_routing = routing_get_current();
 110
 111   if (current_routing->hierarchy_ == simgrid::kernel::routing::NetZoneImpl::RoutingMode::unset)
 112     current_routing->hierarchy_ = simgrid::kernel::routing::NetZoneImpl::RoutingMode::base;
 113   xbt_assert(nullptr == simgrid::s4u::Engine::instance()->netpointByNameOrNull(name),
 114              "Refusing to create a router named '%s': this name already describes a node.", name);
 115
 116   simgrid::kernel::routing::NetPoint* netpoint =
 117       new simgrid::kernel::routing::NetPoint(name, simgrid::kernel::routing::NetPoint::Type::Router, current_routing);
 118   XBT_DEBUG("Router '%s' has the id %d", name, netpoint->id());
 119
 120   if (coords && strcmp(coords, ""))
 121     new simgrid::kernel::routing::vivaldi::Coords(netpoint, coords);
 122
 123
 124   return netpoint;
 125 }
 126
 127 void sg_platf_new_link(LinkCreationArgs* link)
 128 {
 129   std::vector<std::string> names;
 130
 131   if (link->policy == SURF_LINK_FULLDUPLEX) {
 132     names.push_back(link->id+ "_UP");
 133     names.push_back(link->id+ "_DOWN");
 134   } else {
 135     names.push_back(link->id);
 136   }
 137   for (auto link_name : names) {
 138     simgrid::surf::LinkImpl* l =
 139         surf_network_model->createLink(link_name.c_str(), link->bandwidth, link->latency, link->policy);
 140
 141     if (link->properties) {
 142       xbt_dict_cursor_t cursor = nullptr;
 143       char* key;
 144       char* data;
 145       xbt_dict_foreach (link->properties, cursor, key, data)
 146         l->setProperty(key, data);
 147       xbt_dict_free(&link->properties);
 148     }
 149
 150     if (link->latency_trace)
 151       l->setLatencyTrace(link->latency_trace);
 152     if (link->bandwidth_trace)
 153       l->setBandwidthTrace(link->bandwidth_trace);
 154     if (link->state_trace)
 155       l->setStateTrace(link->state_trace);
 156   }
 157 }
 158
 159 void sg_platf_new_cluster(sg_platf_cluster_cbarg_t cluster)
 160 {
 161   using simgrid::kernel::routing::ClusterZone;
 162   using simgrid::kernel::routing::DragonflyZone;
 163   using simgrid::kernel::routing::FatTreeZone;
 164   using simgrid::kernel::routing::TorusZone;
 165
 166   int rankId=0;
 167
 168   // What an inventive way of initializing the AS that I have as ancestor :-(
 169   s_sg_platf_AS_cbarg_t AS;
 170   AS.id = cluster->id;
 171   switch (cluster->topology) {
 172   case SURF_CLUSTER_TORUS:
 173     AS.routing = A_surfxml_AS_routing_ClusterTorus;
 174     break;
 175   case SURF_CLUSTER_DRAGONFLY:
 176     AS.routing = A_surfxml_AS_routing_ClusterDragonfly;
 177     break;
 178   case SURF_CLUSTER_FAT_TREE:
 179     AS.routing = A_surfxml_AS_routing_ClusterFatTree;
 180     break;
 181   default:
 182     AS.routing = A_surfxml_AS_routing_Cluster;
 183     break;
 184   }
 185   sg_platf_new_AS_begin(&AS);
 186   simgrid::kernel::routing::ClusterZone* current_as = static_cast<ClusterZone*>(routing_get_current());
 187   current_as->parse_specific_arguments(cluster);
 188
 189   if(cluster->loopback_bw > 0 || cluster->loopback_lat > 0){
 190     current_as->linkCountPerNode_++;
 191     current_as->hasLoopback_ = 1;
 192   }
 193
 194   if(cluster->limiter_link > 0){
 195     current_as->linkCountPerNode_++;
 196     current_as->hasLimiter_ = 1;
 197   }
 198
 199   for (int i : *cluster->radicals) {
 200     char * host_id = bprintf("%s%d%s", cluster->prefix, i, cluster->suffix);
 201     char * link_id = bprintf("%s_link_%d", cluster->id, i);
 202
 203     XBT_DEBUG("<host\tid=\"%s\"\tpower=\"%f\">", host_id, cluster->speeds.front());
 204
 205     s_sg_platf_host_cbarg_t host;
 206     memset(&host, 0, sizeof(host));
 207     host.id = host_id;
 208     if ((cluster->properties != nullptr) && (not xbt_dict_is_empty(cluster->properties))) {
 209       xbt_dict_cursor_t cursor=nullptr;
 210       char *key;
 211       char* data;
 212       host.properties = xbt_dict_new_homogeneous(free);
 213
 214       xbt_dict_foreach(cluster->properties,cursor,key,data) {
 215         xbt_dict_set(host.properties, key, xbt_strdup(data), nullptr);
 216       }
 217     }
 218
 219     host.speed_per_pstate = cluster->speeds;
 220     host.pstate = 0;
 221     host.core_amount = cluster->core_amount;
 222     host.coord = "";
 223     sg_platf_new_host(&host);
 224     XBT_DEBUG("</host>");
 225
 226     XBT_DEBUG("<link\tid=\"%s\"\tbw=\"%f\"\tlat=\"%f\"/>", link_id, cluster->bw, cluster->lat);
 227
 228     // All links are saved in a matrix;
 229     // every row describes a single node; every node may have multiple links.
 230     // the first column may store a link from x to x if p_has_loopback is set
 231     // the second column may store a limiter link if p_has_limiter is set
 232     // other columns are to store one or more link for the node
 233
 234     //add a loopback link
 235     simgrid::surf::LinkImpl* linkUp   = nullptr;
 236     simgrid::surf::LinkImpl* linkDown = nullptr;
 237     if(cluster->loopback_bw > 0 || cluster->loopback_lat > 0){
 238       char *tmp_link = bprintf("%s_loopback", link_id);
 239       XBT_DEBUG("<loopback\tid=\"%s\"\tbw=\"%f\"/>", tmp_link, cluster->loopback_bw);
 240
 241       LinkCreationArgs link;
 242       link.id        = tmp_link;
 243       link.bandwidth = cluster->loopback_bw;
 244       link.latency   = cluster->loopback_lat;
 245       link.policy    = SURF_LINK_FATPIPE;
 246       sg_platf_new_link(&link);
 247       linkUp   = simgrid::surf::LinkImpl::byName(tmp_link);
 248       linkDown = simgrid::surf::LinkImpl::byName(tmp_link);
 249       free(tmp_link);
 250
 251       auto as_cluster = static_cast<ClusterZone*>(current_as);
 252       as_cluster->privateLinks_.insert({rankId * as_cluster->linkCountPerNode_, {linkUp, linkDown}});
 253     }
 254
 255     //add a limiter link (shared link to account for maximal bandwidth of the node)
 256     linkUp   = nullptr;
 257     linkDown = nullptr;
 258     if(cluster->limiter_link > 0){
 259       char *tmp_link = bprintf("%s_limiter", link_id);
 260       XBT_DEBUG("<limiter\tid=\"%s\"\tbw=\"%f\"/>", tmp_link, cluster->limiter_link);
 261
 262       LinkCreationArgs link;
 263       link.id = tmp_link;
 264       link.bandwidth = cluster->limiter_link;
 265       link.latency = 0;
 266       link.policy = SURF_LINK_SHARED;
 267       sg_platf_new_link(&link);
 268       linkDown = simgrid::surf::LinkImpl::byName(tmp_link);
 269       linkUp   = linkDown;
 270       free(tmp_link);
 271       current_as->privateLinks_.insert(
 272           {rankId * current_as->linkCountPerNode_ + current_as->hasLoopback_, {linkUp, linkDown}});
 273     }
 274
 275     //call the cluster function that adds the others links
 276     if (cluster->topology == SURF_CLUSTER_FAT_TREE) {
 277       static_cast<FatTreeZone*>(current_as)->addProcessingNode(i);
 278     } else {
 279       current_as->create_links_for_node(cluster, i, rankId,
 280           rankId*current_as->linkCountPerNode_ + current_as->hasLoopback_ + current_as->hasLimiter_ );
 281     }
 282     xbt_free(link_id);
 283     xbt_free(host_id);
 284     rankId++;
 285   }
 286   xbt_dict_free(&cluster->properties);
 287
 288   // Add a router.
 289   XBT_DEBUG(" ");
 290   XBT_DEBUG("<router id=\"%s\"/>", cluster->router_id);
 291   if (not cluster->router_id || not strcmp(cluster->router_id, "")) {
 292     char* newid         = bprintf("%s%s_router%s", cluster->prefix, cluster->id, cluster->suffix);
 293     current_as->router_ = sg_platf_new_router(newid, NULL);
 294     free(newid);
 295   } else {
 296     current_as->router_ = sg_platf_new_router(cluster->router_id, NULL);
 297   }
 298
 299   //Make the backbone
 300   if ((cluster->bb_bw > 0) || (cluster->bb_lat > 0)) {
 301
 302     LinkCreationArgs link;
 303     link.id        = std::string(cluster->id)+ "_backbone";
 304     link.bandwidth = cluster->bb_bw;
 305     link.latency   = cluster->bb_lat;
 306     link.policy    = cluster->bb_sharing_policy;
 307
 308     XBT_DEBUG("<link\tid=\"%s\" bw=\"%f\" lat=\"%f\"/>", link.id.c_str(), cluster->bb_bw, cluster->bb_lat);
 309     sg_platf_new_link(&link);
 310
 311     routing_cluster_add_backbone(simgrid::surf::LinkImpl::byName(link.id.c_str()));
 312   }
 313
 314   XBT_DEBUG("</AS>");
 315   sg_platf_new_AS_seal();
 316
 317   simgrid::surf::on_cluster(cluster);
 318   delete cluster->radicals;
 319 }
 320
 321 void routing_cluster_add_backbone(simgrid::surf::LinkImpl* bb)
 322 {
 323   simgrid::kernel::routing::ClusterZone* cluster =
 324       dynamic_cast<simgrid::kernel::routing::ClusterZone*>(current_routing);
 325
 326   xbt_assert(cluster, "Only hosts from Cluster can get a backbone.");
 327   xbt_assert(nullptr == cluster->backbone_, "Cluster %s already has a backbone link!", cluster->name());
 328
 329   cluster->backbone_ = bb;
 330   XBT_DEBUG("Add a backbone to AS '%s'", current_routing->name());
 331 }
 332
 333 void sg_platf_new_cabinet(sg_platf_cabinet_cbarg_t cabinet)
 334 {
 335   for (int radical : *cabinet->radicals) {
 336     std::string hostname = std::string(cabinet->prefix) + std::to_string(radical) + std::string(cabinet->suffix);
 337     s_sg_platf_host_cbarg_t host;
 338     memset(&host, 0, sizeof(host));
 339     host.pstate           = 0;
 340     host.core_amount      = 1;
 341     host.id               = hostname.c_str();
 342     host.speed_per_pstate.push_back(cabinet->speed);
 343     sg_platf_new_host(&host);
 344
 345     LinkCreationArgs link;
 346     link.policy    = SURF_LINK_FULLDUPLEX;
 347     link.latency   = cabinet->lat;
 348     link.bandwidth = cabinet->bw;
 349     link.id        = "link_" + hostname;
 350     sg_platf_new_link(&link);
 351
 352     s_sg_platf_host_link_cbarg_t host_link;
 353     memset(&host_link, 0, sizeof(host_link));
 354     host_link.id        = hostname.c_str();
 355     host_link.link_up   = bprintf("link_%s_UP",hostname.c_str());
 356     host_link.link_down = bprintf("link_%s_DOWN",hostname.c_str());
 357     sg_platf_new_hostlink(&host_link);
 358     free((char*)host_link.link_up);
 359     free((char*)host_link.link_down);
 360   }
 361   delete cabinet->radicals;
 362 }
 363
 364 void sg_platf_new_storage(sg_platf_storage_cbarg_t storage)
 365 {
 366   xbt_assert(std::find(known_storages.begin(), known_storages.end(), storage->id) == known_storages.end(),
 367              "Refusing to add a second storage named \"%s\"", storage->id);
 368
 369   xbt_assert(storage_types.find(storage->type_id) != storage_types.end(), "No storage type '%s'", storage->type_id);
 370   storage_type_t stype = storage_types.at(storage->type_id);
 371
 372   XBT_DEBUG("ROUTING Create a storage name '%s' with type_id '%s' and content '%s'", storage->id, storage->type_id,
 373             storage->content);
 374
 375   known_storages.push_back(storage->id);
 376
 377   // if storage content is not specified use the content of storage_type if any
 378   if (not strcmp(storage->content, "") && strcmp(stype->content, "")) {
 379     storage->content      = stype->content;
 380     XBT_DEBUG("For disk '%s' content is empty, inherit the content (of type %s)", storage->id, stype->type_id);
 381   }
 382
 383   XBT_DEBUG("SURF storage create resource\n\t\tid '%s'\n\t\ttype '%s' "
 384             "\n\t\tmodel '%s' \n\t\tcontent '%s' "
 385             "\n\t\tproperties '%p''\n",
 386             storage->id, stype->model, stype->type_id, storage->content, storage->properties);
 387
 388   auto s = surf_storage_model->createStorage(storage->id, stype->type_id, storage->content, storage->attach);
 389
 390   if (storage->properties) {
 391     xbt_dict_cursor_t cursor = nullptr;
 392     char *key;
 393     char* data;
 394     xbt_dict_foreach (storage->properties, cursor, key, data)
 395       s->setProperty(key, data);
 396     xbt_dict_free(&storage->properties);
 397   }
 398 }
 399
 400 void sg_platf_new_storage_type(sg_platf_storage_type_cbarg_t storage_type)
 401 {
 402   xbt_assert(storage_types.find(storage_type->id) == storage_types.end(),
 403              "Reading a storage type, processing unit \"%s\" already exists", storage_type->id);
 404
 405   storage_type_t stype = xbt_new0(s_storage_type_t, 1);
 406   stype->model = xbt_strdup(storage_type->model);
 407   stype->properties = storage_type->properties;
 408   stype->content = xbt_strdup(storage_type->content);
 409   stype->type_id = xbt_strdup(storage_type->id);
 410   stype->size = storage_type->size;
 411   stype->model_properties = storage_type->model_properties;
 412
 413   XBT_DEBUG("ROUTING Create a storage type id '%s' with model '%s', content '%s'", stype->type_id, stype->model,
 414             storage_type->content);
 415
 416   storage_types.insert({std::string(stype->type_id), stype});
 417 }
 418
 419 void sg_platf_new_mount(sg_platf_mount_cbarg_t mount){
 420   xbt_assert(std::find(known_storages.begin(), known_storages.end(), mount->storageId) != known_storages.end(),
 421              "Cannot mount non-existent disk \"%s\"", mount->storageId);
 422
 423   XBT_DEBUG("ROUTING Mount '%s' on '%s'",mount->storageId, mount->name);
 424
 425   if (mount_list.empty())
 426     XBT_DEBUG("Create a Mount list for %s", A_surfxml_host_id);
 427   mount_list.insert({std::string(mount->name), simgrid::surf::StorageImpl::byName(mount->storageId)});
 428 }
 429
 430 void sg_platf_new_route(sg_platf_route_cbarg_t route)
 431 {
 432   routing_get_current()->addRoute(route);
 433 }
 434
 435 void sg_platf_new_bypassRoute(sg_platf_route_cbarg_t bypassRoute)
 436 {
 437   routing_get_current()->addBypassRoute(bypassRoute);
 438 }
 439
 440 void sg_platf_new_process(sg_platf_process_cbarg_t process)
 441 {
 442   sg_host_t host = sg_host_by_name(process->host);
 443   if (not host) {
 444     // The requested host does not exist. Do a nice message to the user
 445     std::string msg = std::string("Cannot create process '") + process->function + "': host '" + process->host +
 446                       "' does not exist\nExisting hosts: '";
 447     for (auto kv : simgrid::s4u::host_list) {
 448       simgrid::s4u::Host* host = kv.second;
 449       msg += host->name();
 450       msg += "', '";
 451       if (msg.length() > 1024) {
 452         msg.pop_back(); // remove trailing quote
 453         msg += "...(list truncated)......";
 454         break;
 455       }
 456     }
 457     xbt_die("%s", msg.c_str());
 458   }
 459   simgrid::simix::ActorCodeFactory& factory = SIMIX_get_actor_code_factory(process->function);
 460   xbt_assert(factory, "Function '%s' unknown", process->function);
 461
 462   double start_time = process->start_time;
 463   double kill_time  = process->kill_time;
 464   int auto_restart = process->on_failure == SURF_ACTOR_ON_FAILURE_DIE ? 0 : 1;
 465
 466   std::vector<std::string> args(process->argv, process->argv + process->argc);
 467   std::function<void()> code = factory(std::move(args));
 468
 469   smx_process_arg_t arg = nullptr;
 470
 471   arg = new simgrid::simix::ProcessArg();
 472   arg->name = std::string(process->argv[0]);
 473   arg->code = code;
 474   arg->data = nullptr;
 475   arg->host = host;
 476   arg->kill_time = kill_time;
 477   arg->properties = current_property_set;
 478
 479   host->extension<simgrid::simix::Host>()->boot_processes.push_back(arg);
 480
 481   if (start_time > SIMIX_get_clock()) {
 482
 483     arg = new simgrid::simix::ProcessArg();
 484     arg->name = std::string(process->argv[0]);
 485     arg->code = std::move(code);
 486     arg->data = nullptr;
 487     arg->host = host;
 488     arg->kill_time = kill_time;
 489     arg->properties = current_property_set;
 490
 491     XBT_DEBUG("Process %s@%s will be started at time %f", arg->name.c_str(), arg->host->cname(), start_time);
 492     SIMIX_timer_set(start_time, [arg, auto_restart]() {
 493       smx_actor_t actor = simix_global->create_process_function(arg->name.c_str(), std::move(arg->code), arg->data,
 494                                                                 arg->host, arg->properties, nullptr);
 495       if (arg->kill_time >= 0)
 496         simcall_process_set_kill_time(actor, arg->kill_time);
 497       if (auto_restart)
 498         SIMIX_process_auto_restart_set(actor, auto_restart);
 499       delete arg;
 500     });
 501   } else {                      // start_time <= SIMIX_get_clock()
 502     XBT_DEBUG("Starting Process %s(%s) right now", arg->name.c_str(), host->cname());
 503
 504     smx_actor_t actor = simix_global->create_process_function(arg->name.c_str(), std::move(code), nullptr, host,
 505                                                               current_property_set, nullptr);
 506
 507     /* The actor creation will fail if the host is currently dead, but that's fine */
 508     if (actor != nullptr) {
 509       if (arg->kill_time >= 0)
 510         simcall_process_set_kill_time(actor, arg->kill_time);
 511       if (auto_restart)
 512         SIMIX_process_auto_restart_set(actor, auto_restart);
 513     }
 514   }
 515   current_property_set = nullptr;
 516 }
 517
 518 void sg_platf_new_peer(sg_platf_peer_cbarg_t peer)
 519 {
 520   simgrid::kernel::routing::VivaldiZone* as = dynamic_cast<simgrid::kernel::routing::VivaldiZone*>(current_routing);
 521   xbt_assert(as, "<peer> tag can only be used in Vivaldi netzones.");
 522
 523   std::vector<double> speedPerPstate;
 524   speedPerPstate.push_back(peer->speed);
 525   simgrid::s4u::Host* host = as->createHost(peer->id, &speedPerPstate, 1, nullptr);
 526
 527   as->setPeerLink(host->pimpl_netpoint, peer->bw_in, peer->bw_out, peer->coord);
 528
 529   /* Change from the defaults */
 530   if (peer->state_trace)
 531     host->pimpl_cpu->setStateTrace(peer->state_trace);
 532   if (peer->speed_trace)
 533     host->pimpl_cpu->setSpeedTrace(peer->speed_trace);
 534 }
 535
 536 void sg_platf_begin() { /* Do nothing: just for symmetry of user code */ }
 537
 538 void sg_platf_end() {
 539   simgrid::s4u::onPlatformCreated();
 540 }
 541
 542 /* Pick the right models for CPU, net and host, and call their model_init_preparse */
 543 static void surf_config_models_setup()
 544 {
 545   const char* host_model_name    = xbt_cfg_get_string("host/model");
 546   const char* network_model_name = xbt_cfg_get_string("network/model");
 547   const char* cpu_model_name     = xbt_cfg_get_string("cpu/model");
 548   const char* storage_model_name = xbt_cfg_get_string("storage/model");
 549
 550   /* The compound host model is needed when using non-default net/cpu models */
 551   if ((not xbt_cfg_is_default_value("network/model") || not xbt_cfg_is_default_value("cpu/model")) &&
 552       xbt_cfg_is_default_value("host/model")) {
 553     host_model_name = "compound";
 554     xbt_cfg_set_string("host/model", host_model_name);
 555   }
 556
 557   XBT_DEBUG("host model: %s", host_model_name);
 558   if (not strcmp(host_model_name, "compound")) {
 559     xbt_assert(cpu_model_name, "Set a cpu model to use with the 'compound' host model");
 560     xbt_assert(network_model_name, "Set a network model to use with the 'compound' host model");
 561
 562     int cpu_id = find_model_description(surf_cpu_model_description, cpu_model_name);
 563     surf_cpu_model_description[cpu_id].model_init_preparse();
 564
 565     int network_id = find_model_description(surf_network_model_description, network_model_name);
 566     surf_network_model_description[network_id].model_init_preparse();
 567   }
 568
 569   XBT_DEBUG("Call host_model_init");
 570   int host_id = find_model_description(surf_host_model_description, host_model_name);
 571   surf_host_model_description[host_id].model_init_preparse();
 572
 573   XBT_DEBUG("Call vm_model_init");
 574   surf_vm_model_init_HL13();
 575
 576   XBT_DEBUG("Call storage_model_init");
 577   int storage_id = find_model_description(surf_storage_model_description, storage_model_name);
 578   surf_storage_model_description[storage_id].model_init_preparse();
 579 }
 580
 581 /**
 582  * \brief Add an AS to the platform
 583  *
 584  * Add a new autonomous system to the platform. Any elements (such as host,
 585  * router or sub-AS) added after this call and before the corresponding call
 586  * to sg_platf_new_AS_seal() will be added to this AS.
 587  *
 588  * Once this function was called, the configuration concerning the used
 589  * models cannot be changed anymore.
 590  *
 591  * @param AS the parameters defining the AS to build.
 592  */
 593 simgrid::s4u::NetZone* sg_platf_new_AS_begin(sg_platf_AS_cbarg_t AS)
 594 {
 595   if (not surf_parse_models_setup_already_called) {
 596     /* Initialize the surf models. That must be done after we got all config, and before we need the models.
 597      * That is, after the last <config> tag, if any, and before the first of cluster|peer|AS|trace|trace_connect
 598      *
 599      * I'm not sure for <trace> and <trace_connect>, there may be a bug here
 600      * (FIXME: check it out by creating a file beginning with one of these tags)
 601      * but cluster and peer create ASes internally, so putting the code in there is ok.
 602      */
 603     surf_parse_models_setup_already_called = 1;
 604     surf_config_models_setup();
 605   }
 606
 607   _sg_cfg_init_status = 2; /* HACK: direct access to the global controlling the level of configuration to prevent
 608                             * any further config now that we created some real content */
 609
 610   /* search the routing model */
 611   simgrid::kernel::routing::NetZoneImpl* new_as = nullptr;
 612   switch(AS->routing){
 613     case A_surfxml_AS_routing_Cluster:
 614       new_as = new simgrid::kernel::routing::ClusterZone(current_routing, AS->id);
 615       break;
 616     case A_surfxml_AS_routing_ClusterDragonfly:
 617       new_as = new simgrid::kernel::routing::DragonflyZone(current_routing, AS->id);
 618       break;
 619     case A_surfxml_AS_routing_ClusterTorus:
 620       new_as = new simgrid::kernel::routing::TorusZone(current_routing, AS->id);
 621       break;
 622     case A_surfxml_AS_routing_ClusterFatTree:
 623       new_as = new simgrid::kernel::routing::FatTreeZone(current_routing, AS->id);
 624       break;
 625     case A_surfxml_AS_routing_Dijkstra:
 626       new_as = new simgrid::kernel::routing::DijkstraZone(current_routing, AS->id, 0);
 627       break;
 628     case A_surfxml_AS_routing_DijkstraCache:
 629       new_as = new simgrid::kernel::routing::DijkstraZone(current_routing, AS->id, 1);
 630       break;
 631     case A_surfxml_AS_routing_Floyd:
 632       new_as = new simgrid::kernel::routing::FloydZone(current_routing, AS->id);
 633       break;
 634     case A_surfxml_AS_routing_Full:
 635       new_as = new simgrid::kernel::routing::FullZone(current_routing, AS->id);
 636       break;
 637     case A_surfxml_AS_routing_None:
 638       new_as = new simgrid::kernel::routing::EmptyZone(current_routing, AS->id);
 639       break;
 640     case A_surfxml_AS_routing_Vivaldi:
 641       new_as = new simgrid::kernel::routing::VivaldiZone(current_routing, AS->id);
 642       break;
 643     default:
 644       xbt_die("Not a valid model!");
 645       break;
 646   }
 647
 648   if (current_routing == nullptr) { /* it is the first one */
 649     xbt_assert(simgrid::s4u::Engine::instance()->pimpl->netRoot_ == nullptr,
 650                "All defined components must belong to a networking zone.");
 651     simgrid::s4u::Engine::instance()->pimpl->netRoot_ = new_as;
 652
 653   } else {
 654     /* set the father behavior */
 655     if (current_routing->hierarchy_ == simgrid::kernel::routing::NetZoneImpl::RoutingMode::unset)
 656       current_routing->hierarchy_ = simgrid::kernel::routing::NetZoneImpl::RoutingMode::recursive;
 657     /* add to the sons dictionary */
 658     current_routing->children()->push_back(static_cast<simgrid::s4u::NetZone*>(new_as));
 659   }
 660
 661   /* set the new current component of the tree */
 662   current_routing = new_as;
 663
 664   simgrid::s4u::NetZone::onCreation(*new_as); // notify the signal
 665
 666   return new_as;
 667 }
 668
 669 /**
 670  * \brief Specify that the description of the current AS is finished
 671  *
 672  * Once you've declared all the content of your AS, you have to seal
 673  * it with this call. Your AS is not usable until you call this function.
 674  */
 675 void sg_platf_new_AS_seal()
 676 {
 677   xbt_assert(current_routing, "Cannot seal the current AS: none under construction");
 678   current_routing->seal();
 679   simgrid::s4u::NetZone::onSeal(*current_routing);
 680   current_routing = static_cast<simgrid::kernel::routing::NetZoneImpl*>(current_routing->father());
 681 }
 682
 683 /** @brief Add a link connecting an host to the rest of its AS (which must be cluster or vivaldi) */
 684 void sg_platf_new_hostlink(sg_platf_host_link_cbarg_t hostlink)
 685 {
 686   simgrid::kernel::routing::NetPoint* netpoint = sg_host_by_name(hostlink->id)->pimpl_netpoint;
 687   xbt_assert(netpoint, "Host '%s' not found!", hostlink->id);
 688   xbt_assert(dynamic_cast<simgrid::kernel::routing::ClusterZone*>(current_routing),
 689              "Only hosts from Cluster and Vivaldi ASes can get an host_link.");
 690
 691   simgrid::surf::LinkImpl* linkUp   = simgrid::surf::LinkImpl::byName(hostlink->link_up);
 692   simgrid::surf::LinkImpl* linkDown = simgrid::surf::LinkImpl::byName(hostlink->link_down);
 693
 694   xbt_assert(linkUp, "Link '%s' not found!", hostlink->link_up);
 695   xbt_assert(linkDown, "Link '%s' not found!", hostlink->link_down);
 696
 697   auto as_cluster = static_cast<simgrid::kernel::routing::ClusterZone*>(current_routing);
 698
 699   if (as_cluster->privateLinks_.find(netpoint->id()) != as_cluster->privateLinks_.end())
 700     surf_parse_error("Host_link for '%s' is already defined!",hostlink->id);
 701
 702   XBT_DEBUG("Push Host_link for host '%s' to position %d", netpoint->cname(), netpoint->id());
 703   as_cluster->privateLinks_.insert({netpoint->id(), {linkUp, linkDown}});
 704 }
 705
 706 void sg_platf_new_trace(sg_platf_trace_cbarg_t trace)
 707 {
 708   tmgr_trace_t tmgr_trace;
 709   if (trace->file && strcmp(trace->file, "") != 0) {
 710     tmgr_trace = tmgr_trace_new_from_file(trace->file);
 711   } else {
 712     xbt_assert(strcmp(trace->pc_data, ""),
 713         "Trace '%s' must have either a content, or point to a file on disk.",trace->id);
 714     tmgr_trace = tmgr_trace_new_from_string(trace->id, trace->pc_data, trace->periodicity);
 715   }
 716   xbt_dict_set(traces_set_list, trace->id, static_cast<void*>(tmgr_trace), nullptr);
 717 }