src/surf/cpu_cas01.cpp

   1 /* Copyright (c) 2009-2021. 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 "cpu_cas01.hpp"
   7 #include "simgrid/kernel/routing/NetZoneImpl.hpp"
   8 #include "simgrid/s4u/Engine.hpp"
   9 #include "simgrid/sg_config.hpp"
  10 #include "src/kernel/EngineImpl.hpp"
  11 #include "src/kernel/resource/profile/Event.hpp"
  12 #include "src/surf/cpu_ti.hpp"
  13 #include "src/surf/surf_interface.hpp"
  14 #include "surf/surf.hpp"
  15
  16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
  17
  18 /***********
  19  * Options *
  20  ***********/
  21
  22 static simgrid::config::Flag<std::string>
  23     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
  24
  25                   std::map<std::string, std::string, std::less<>>({
  26                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
  27                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
  28                              "for the Cas01 CPU model for now)."},
  29                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
  30                   }),
  31
  32                   [](std::string const&) {
  33                     xbt_assert(_sg_cfg_init_status < 2,
  34                                "Cannot change the optimization algorithm after the initialization");
  35                   });
  36
  37 /*********
  38  * Model *
  39  *********/
  40 void surf_cpu_model_init_Cas01()
  41 {
  42   if (cpu_optim_opt == "TI") {
  43     simgrid::kernel::resource::CpuTiModel::create_pm_models();
  44     return;
  45   }
  46
  47   auto cpu_model_pm = std::make_shared<simgrid::kernel::resource::CpuCas01Model>();
  48   simgrid::kernel::EngineImpl::get_instance()->add_model(simgrid::kernel::resource::Model::Type::CPU_PM, cpu_model_pm,
  49                                                          true);
  50   simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_cpu_pm_model(cpu_model_pm);
  51 }
  52
  53 namespace simgrid {
  54 namespace kernel {
  55 namespace resource {
  56
  57 CpuCas01Model::CpuCas01Model()
  58 {
  59   if (config::get_value<std::string>("cpu/optim") == "Lazy")
  60     set_update_algorithm(Model::UpdateAlgo::LAZY);
  61
  62   bool select = config::get_value<bool>("cpu/maxmin-selective-update");
  63
  64   if (is_update_lazy()) {
  65     xbt_assert(select || config::is_default("cpu/maxmin-selective-update"),
  66                "You cannot disable cpu selective update when using the lazy update mechanism");
  67     select = true;
  68   }
  69
  70   set_maxmin_system(new lmm::System(select));
  71 }
  72
  73 Cpu* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
  74 {
  75   return (new CpuCas01(host, speed_per_pstate))->set_model(this);
  76 }
  77
  78 /************
  79  * Resource *
  80  ************/
  81 bool CpuCas01::is_used() const
  82 {
  83   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
  84 }
  85
  86 /** @brief take into account changes of speed (either load or max) */
  87 void CpuCas01::on_speed_change()
  88 {
  89   const lmm::Variable* var;
  90   const lmm::Element* elem = nullptr;
  91
  92   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
  93                                                             get_core_count() * speed_.scale * speed_.peak);
  94   while ((var = get_constraint()->get_variable(&elem))) {
  95     const CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
  96
  97     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
  98                                                             action->requested_core() * speed_.scale * speed_.peak);
  99   }
 100
 101   Cpu::on_speed_change();
 102 }
 103
 104 void CpuCas01::apply_event(profile::Event* event, double value)
 105 {
 106   if (event == speed_.event) {
 107     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 108     xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 109
 110     speed_.scale = value;
 111     on_speed_change();
 112
 113     tmgr_trace_event_unref(&speed_.event);
 114   } else if (event == state_event_) {
 115     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 116     xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
 117
 118     if (value > 0) {
 119       if (not is_on()) {
 120         XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
 121         get_iface()->turn_on();
 122       }
 123     } else {
 124       const lmm::Constraint* cnst = get_constraint();
 125       const lmm::Variable* var;
 126       const lmm::Element* elem = nullptr;
 127       double date              = surf_get_clock();
 128
 129       get_iface()->turn_off();
 130
 131       while ((var = cnst->get_variable(&elem))) {
 132         Action* action = var->get_id();
 133
 134         if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
 135             action->get_state() == Action::State::IGNORED) {
 136           action->set_finish_time(date);
 137           action->set_state(Action::State::FAILED);
 138         }
 139       }
 140     }
 141     tmgr_trace_event_unref(&state_event_);
 142
 143   } else {
 144     xbt_die("Unknown event!\n");
 145   }
 146 }
 147
 148 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 149 CpuAction* CpuCas01::execution_start(double size)
 150 {
 151   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint());
 152 }
 153
 154 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
 155 {
 156   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(),
 157                             requested_cores);
 158 }
 159
 160 CpuAction* CpuCas01::sleep(double duration)
 161 {
 162   if (duration > 0)
 163     duration = std::max(duration, sg_surf_precision);
 164
 165   XBT_IN("(%s,%g)", get_cname(), duration);
 166   auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint());
 167
 168   // FIXME: sleep variables should not consume 1.0 in System::expand()
 169   action->set_max_duration(duration);
 170   action->set_suspend_state(Action::SuspendStates::SLEEPING);
 171   if (duration == NO_MAX_DURATION)
 172     action->set_state(Action::State::IGNORED);
 173
 174   get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
 175   if (get_model()->is_update_lazy()) { // remove action from the heap
 176     get_model()->get_action_heap().remove(action);
 177     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 178     // max_duration correctly at the next call to share_resources
 179     get_model()->get_modified_set()->push_front(*action);
 180   }
 181
 182   XBT_OUT();
 183   return action;
 184 }
 185
 186 /**********
 187  * Action *
 188  **********/
 189 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
 190                                int requested_core)
 191     : CpuAction(model, cost, failed,
 192                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
 193     , requested_core_(requested_core)
 194 {
 195   if (model->is_update_lazy())
 196     set_last_update();
 197   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 198 }
 199
 200 int CpuCas01Action::requested_core() const
 201 {
 202   return requested_core_;
 203 }
 204
 205 } // namespace resource
 206 } // namespace kernel
 207 } // namespace simgrid