src/surf/ptask_L07.cpp

   1 /* Copyright (c) 2007-2021. 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 "ptask_L07.hpp"
   7 #include "src/kernel/EngineImpl.hpp"
   8 #include "src/kernel/resource/profile/Event.hpp"
   9 #include "surf/surf.hpp"
  10 #include "xbt/config.hpp"
  11
  12 #include <unordered_set>
  13
  14 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(res_host);
  15 XBT_LOG_EXTERNAL_CATEGORY(xbt_cfg);
  16
  17 /**************************************/
  18 /*** Resource Creation & Destruction **/
  19 /**************************************/
  20 void surf_host_model_init_ptask_L07()
  21 {
  22   XBT_CINFO(xbt_cfg, "Switching to the L07 model to handle parallel tasks.");
  23
  24   auto host_model = std::make_shared<simgrid::surf::HostL07Model>();
  25   simgrid::kernel::EngineImpl::get_instance()->add_model(simgrid::kernel::resource::Model::Type::HOST,
  26                                                          std::move(host_model), true);
  27 }
  28
  29 namespace simgrid {
  30 namespace surf {
  31
  32 HostL07Model::HostL07Model() : HostModel()
  33 {
  34   auto* maxmin_system = new simgrid::kernel::lmm::FairBottleneck(true /* selective update */);
  35   set_maxmin_system(maxmin_system);
  36
  37   net_model_  = std::make_unique<NetworkL07Model>(this, maxmin_system);
  38   auto engine = simgrid::kernel::EngineImpl::get_instance();
  39   engine->add_model_ptask(simgrid::kernel::resource::Model::Type::NETWORK, net_model_.get(), true);
  40
  41   cpu_model_ = std::make_unique<CpuL07Model>(this, maxmin_system);
  42   engine->add_model_ptask(simgrid::kernel::resource::Model::Type::CPU_PM, cpu_model_.get(), true);
  43 }
  44
  45 HostL07Model::~HostL07Model() {}
  46
  47 CpuL07Model::CpuL07Model(HostL07Model* hmodel, kernel::lmm::System* sys)
  48     : CpuModel(Model::UpdateAlgo::FULL), hostModel_(hmodel)
  49 {
  50   set_maxmin_system(sys);
  51 }
  52
  53 CpuL07Model::~CpuL07Model()
  54 {
  55   set_maxmin_system(nullptr);
  56 }
  57
  58 NetworkL07Model::NetworkL07Model(HostL07Model* hmodel, kernel::lmm::System* sys)
  59     : NetworkModel(Model::UpdateAlgo::FULL), hostModel_(hmodel)
  60 {
  61   set_maxmin_system(sys);
  62   loopback_ = NetworkL07Model::create_link(
  63                   "__loopback__", std::vector<double>{simgrid::config::get_value<double>("network/loopback-bw")},
  64                   s4u::Link::SharingPolicy::FATPIPE)
  65                   ->set_latency(simgrid::config::get_value<double>("network/loopback-lat"));
  66   loopback_->seal();
  67 }
  68
  69 NetworkL07Model::~NetworkL07Model()
  70 {
  71   set_maxmin_system(nullptr);
  72 }
  73
  74 double HostL07Model::next_occurring_event(double now)
  75 {
  76   double min = HostModel::next_occurring_event_full(now);
  77   for (kernel::resource::Action const& action : *get_started_action_set()) {
  78     const auto& net_action = static_cast<const L07Action&>(action);
  79     if (net_action.get_latency() > 0 && (min < 0 || net_action.get_latency() < min)) {
  80       min = net_action.get_latency();
  81       XBT_DEBUG("Updating min with %p (start %f): %f", &net_action, net_action.get_start_time(), min);
  82     }
  83   }
  84   XBT_DEBUG("min value: %f", min);
  85
  86   return min;
  87 }
  88
  89 void HostL07Model::update_actions_state(double /*now*/, double delta)
  90 {
  91   for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
  92     auto& action = static_cast<L07Action&>(*it);
  93     ++it; // increment iterator here since the following calls to action.finish() may invalidate it
  94     if (action.get_latency() > 0) {
  95       if (action.get_latency() > delta) {
  96         action.update_latency(delta, sg_surf_precision);
  97       } else {
  98         action.set_latency(0.0);
  99       }
 100       if ((action.get_latency() <= 0.0) && (action.is_suspended() == 0)) {
 101         action.updateBound();
 102         get_maxmin_system()->update_variable_penalty(action.get_variable(), 1.0);
 103         action.set_last_update();
 104       }
 105     }
 106     XBT_DEBUG("Action (%p) : remains (%g) updated by %g.", &action, action.get_remains(),
 107               action.get_variable()->get_value() * delta);
 108     action.update_remains(action.get_variable()->get_value() * delta);
 109     action.update_max_duration(delta);
 110
 111     XBT_DEBUG("Action (%p) : remains (%g).", &action, action.get_remains());
 112
 113     /* In the next if cascade, the action can be finished either because:
 114      *  - The amount of remaining work reached 0
 115      *  - The max duration was reached
 116      * If it's not done, it may have failed.
 117      */
 118
 119     if (((action.get_remains() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
 120         ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
 121       action.finish(kernel::resource::Action::State::FINISHED);
 122       continue;
 123     }
 124
 125     /* Need to check that none of the model has failed */
 126     int i                               = 0;
 127     const kernel::lmm::Constraint* cnst = action.get_variable()->get_constraint(i);
 128     while (cnst != nullptr) {
 129       i++;
 130       const kernel::resource::Resource* constraint_id = cnst->get_id();
 131       if (not constraint_id->is_on()) {
 132         XBT_DEBUG("Action (%p) Failed!!", &action);
 133         action.finish(kernel::resource::Action::State::FAILED);
 134         break;
 135       }
 136       cnst = action.get_variable()->get_constraint(i);
 137     }
 138   }
 139 }
 140
 141 kernel::resource::CpuAction* HostL07Model::execute_parallel(const std::vector<s4u::Host*>& host_list,
 142                                                             const double* flops_amount, const double* bytes_amount,
 143                                                             double rate)
 144 {
 145   return new L07Action(this, host_list, flops_amount, bytes_amount, rate);
 146 }
 147
 148 L07Action::L07Action(kernel::resource::Model* model, const std::vector<s4u::Host*>& host_list,
 149                      const double* flops_amount, const double* bytes_amount, double rate)
 150     : CpuAction(model, 1.0, false), computationAmount_(flops_amount), communicationAmount_(bytes_amount), rate_(rate)
 151 {
 152   size_t link_nb      = 0;
 153   size_t used_host_nb = 0; /* Only the hosts with something to compute (>0 flops) are counted) */
 154   double latency      = 0.0;
 155   this->set_last_update();
 156
 157   hostList_.insert(hostList_.end(), host_list.begin(), host_list.end());
 158
 159   if (flops_amount != nullptr)
 160     used_host_nb += std::count_if(flops_amount, flops_amount + host_list.size(), [](double x) { return x > 0.0; });
 161
 162   /* Compute the number of affected resources... */
 163   if (bytes_amount != nullptr) {
 164     std::unordered_set<const char*> affected_links;
 165
 166     for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
 167       if (bytes_amount[k] <= 0)
 168         continue;
 169
 170       double lat = 0.0;
 171       std::vector<kernel::resource::LinkImpl*> route;
 172       hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, &lat);
 173       latency = std::max(latency, lat);
 174
 175       for (auto const& link : route)
 176         affected_links.insert(link->get_cname());
 177     }
 178
 179     link_nb = affected_links.size();
 180   }
 181
 182   XBT_DEBUG("Creating a parallel task (%p) with %zu hosts and %zu unique links.", this, host_list.size(), link_nb);
 183   latency_ = latency;
 184
 185   set_variable(
 186       model->get_maxmin_system()->variable_new(this, 1.0, (rate > 0 ? rate : -1.0), host_list.size() + link_nb));
 187
 188   if (latency_ > 0)
 189     model->get_maxmin_system()->update_variable_penalty(get_variable(), 0.0);
 190
 191   /* Expand it for the CPUs even if there is nothing to compute, to make sure that it gets expended even if there is no
 192    * communication either */
 193   double bound = std::numeric_limits<double>::max();
 194   for (size_t i = 0; i < host_list.size(); i++) {
 195     model->get_maxmin_system()->expand(host_list[i]->pimpl_cpu->get_constraint(), get_variable(),
 196                                        (flops_amount == nullptr ? 0.0 : flops_amount[i]));
 197     if (flops_amount && flops_amount[i] > 0)
 198       bound = std::min(bound, host_list[i]->pimpl_cpu->get_speed(1.0) * host_list[i]->pimpl_cpu->get_speed_ratio() /
 199                                   flops_amount[i]);
 200   }
 201   if (bound < std::numeric_limits<double>::max())
 202     model->get_maxmin_system()->update_variable_bound(get_variable(), bound);
 203
 204   if (bytes_amount != nullptr) {
 205     for (size_t k = 0; k < host_list.size() * host_list.size(); k++) {
 206       if (bytes_amount[k] <= 0.0)
 207         continue;
 208       std::vector<kernel::resource::LinkImpl*> route;
 209       hostList_[k / host_list.size()]->route_to(hostList_[k % host_list.size()], route, nullptr);
 210
 211       for (auto const& link : route)
 212         model->get_maxmin_system()->expand_add(link->get_constraint(), this->get_variable(), bytes_amount[k]);
 213     }
 214   }
 215
 216   if (link_nb + used_host_nb == 0) {
 217     this->set_cost(1.0);
 218     this->set_remains(0.0);
 219   }
 220 }
 221
 222 kernel::resource::Action* NetworkL07Model::communicate(s4u::Host* src, s4u::Host* dst, double size, double rate)
 223 {
 224   std::vector<s4u::Host*> host_list = {src, dst};
 225   const auto* flops_amount          = new double[2]();
 226   auto* bytes_amount                = new double[4]();
 227
 228   bytes_amount[1] = size;
 229
 230   kernel::resource::Action* res = hostModel_->execute_parallel(host_list, flops_amount, bytes_amount, rate);
 231   static_cast<L07Action*>(res)->free_arrays_ = true;
 232   return res;
 233 }
 234
 235 kernel::resource::Cpu* CpuL07Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
 236 {
 237   return (new CpuL07(host, speed_per_pstate))->set_model(this);
 238 }
 239
 240 kernel::resource::LinkImpl* NetworkL07Model::create_link(const std::string& name, const std::vector<double>& bandwidths,
 241                                                          s4u::Link::SharingPolicy policy)
 242 {
 243   xbt_assert(bandwidths.size() == 1, "Non WIFI link must have only 1 bandwidth.");
 244   auto link = new LinkL07(name, bandwidths[0], policy, get_maxmin_system());
 245   link->set_model(this);
 246   return link;
 247 }
 248
 249 /************
 250  * Resource *
 251  ************/
 252
 253 kernel::resource::CpuAction* CpuL07::execution_start(double size)
 254 {
 255   std::vector<s4u::Host*> host_list = {get_iface()};
 256
 257   auto* flops_amount = new double[host_list.size()]();
 258   flops_amount[0]    = size;
 259
 260   kernel::resource::CpuAction* res =
 261       static_cast<CpuL07Model*>(get_model())->hostModel_->execute_parallel(host_list, flops_amount, nullptr, -1);
 262   static_cast<L07Action*>(res)->free_arrays_ = true;
 263   return res;
 264 }
 265
 266 kernel::resource::CpuAction* CpuL07::sleep(double duration)
 267 {
 268   auto* action = static_cast<L07Action*>(execution_start(1.0));
 269   action->set_max_duration(duration);
 270   action->set_suspend_state(kernel::resource::Action::SuspendStates::SLEEPING);
 271   get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
 272
 273   return action;
 274 }
 275
 276 bool CpuL07::is_used() const
 277 {
 278   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
 279 }
 280
 281 /** @brief take into account changes of speed (either load or max) */
 282 void CpuL07::on_speed_change()
 283 {
 284   const kernel::lmm::Variable* var;
 285   const kernel::lmm::Element* elem = nullptr;
 286
 287   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), speed_.peak * speed_.scale);
 288   while ((var = get_constraint()->get_variable(&elem))) {
 289     const kernel::resource::Action* action = var->get_id();
 290
 291     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), speed_.scale * speed_.peak);
 292   }
 293
 294   Cpu::on_speed_change();
 295 }
 296
 297 LinkL07::LinkL07(const std::string& name, double bandwidth, s4u::Link::SharingPolicy policy,
 298                  kernel::lmm::System* system)
 299     : LinkImpl(name)
 300 {
 301   this->set_constraint(system->constraint_new(this, bandwidth));
 302   bandwidth_.peak = bandwidth;
 303
 304   if (policy == s4u::Link::SharingPolicy::FATPIPE)
 305     get_constraint()->unshare();
 306 }
 307
 308 bool LinkL07::is_used() const
 309 {
 310   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
 311 }
 312
 313 void CpuL07::apply_event(kernel::profile::Event* triggered, double value)
 314 {
 315   XBT_DEBUG("Updating cpu %s (%p) with value %g", get_cname(), this, value);
 316   if (triggered == speed_.event) {
 317     speed_.scale = value;
 318     on_speed_change();
 319     tmgr_trace_event_unref(&speed_.event);
 320
 321   } else if (triggered == state_event_) {
 322     if (value > 0) {
 323       if (not is_on()) {
 324         XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
 325         get_iface()->turn_on();
 326       }
 327     } else
 328       get_iface()->turn_off();
 329     tmgr_trace_event_unref(&state_event_);
 330
 331   } else {
 332     xbt_die("Unknown event!\n");
 333   }
 334 }
 335
 336 void LinkL07::apply_event(kernel::profile::Event* triggered, double value)
 337 {
 338   XBT_DEBUG("Updating link %s (%p) with value=%f", get_cname(), this, value);
 339   if (triggered == bandwidth_.event) {
 340     set_bandwidth(value);
 341     tmgr_trace_event_unref(&bandwidth_.event);
 342
 343   } else if (triggered == latency_.event) {
 344     set_latency(value);
 345     tmgr_trace_event_unref(&latency_.event);
 346
 347   } else if (triggered == state_event_) {
 348     if (value > 0)
 349       turn_on();
 350     else
 351       turn_off();
 352     tmgr_trace_event_unref(&state_event_);
 353
 354   } else {
 355     xbt_die("Unknown event ! \n");
 356   }
 357 }
 358
 359 void LinkL07::set_bandwidth(double value)
 360 {
 361   bandwidth_.peak = value;
 362   LinkImpl::on_bandwidth_change();
 363
 364   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(), bandwidth_.peak * bandwidth_.scale);
 365 }
 366
 367 kernel::resource::LinkImpl* LinkL07::set_latency(double value)
 368 {
 369   latency_check(value);
 370   const kernel::lmm::Variable* var;
 371   L07Action* action;
 372   const kernel::lmm::Element* elem = nullptr;
 373
 374   latency_.peak = value;
 375   while ((var = get_constraint()->get_variable(&elem))) {
 376     action = static_cast<L07Action*>(var->get_id());
 377     action->updateBound();
 378   }
 379   return this;
 380 }
 381 LinkL07::~LinkL07() = default;
 382
 383 /**********
 384  * Action *
 385  **********/
 386
 387 L07Action::~L07Action()
 388 {
 389   if (free_arrays_) {
 390     delete[] computationAmount_;
 391     delete[] communicationAmount_;
 392   }
 393 }
 394
 395 void L07Action::updateBound()
 396 {
 397   double lat_current = 0.0;
 398
 399   size_t host_count = hostList_.size();
 400
 401   if (communicationAmount_ != nullptr) {
 402     for (size_t i = 0; i < host_count; i++) {
 403       for (size_t j = 0; j < host_count; j++) {
 404         if (communicationAmount_[i * host_count + j] > 0) {
 405           double lat = 0.0;
 406           std::vector<kernel::resource::LinkImpl*> route;
 407           hostList_.at(i)->route_to(hostList_.at(j), route, &lat);
 408
 409           lat_current = std::max(lat_current, lat * communicationAmount_[i * host_count + j]);
 410         }
 411       }
 412     }
 413   }
 414   double lat_bound = kernel::resource::NetworkModel::cfg_tcp_gamma / (2.0 * lat_current);
 415   XBT_DEBUG("action (%p) : lat_bound = %g", this, lat_bound);
 416   if ((latency_ <= 0.0) && is_running()) {
 417     if (rate_ < 0)
 418       get_model()->get_maxmin_system()->update_variable_bound(get_variable(), lat_bound);
 419     else
 420       get_model()->get_maxmin_system()->update_variable_bound(get_variable(), std::min(rate_, lat_bound));
 421   }
 422 }
 423
 424 } // namespace surf
 425 } // namespace simgrid