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   simgrid::kernel::resource::Model::UpdateAlgo algo;
  48   if (cpu_optim_opt == "Lazy")
  49     algo = simgrid::kernel::resource::Model::UpdateAlgo::LAZY;
  50   else
  51     algo = simgrid::kernel::resource::Model::UpdateAlgo::FULL;
  52
  53   auto cpu_model_pm = std::make_shared<simgrid::kernel::resource::CpuCas01Model>(algo);
  54   simgrid::kernel::EngineImpl::get_instance()->add_model(simgrid::kernel::resource::Model::Type::CPU_PM, cpu_model_pm,
  55                                                          true);
  56   simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_cpu_pm_model(cpu_model_pm);
  57 }
  58
  59 namespace simgrid {
  60 namespace kernel {
  61 namespace resource {
  62
  63 CpuCas01Model::CpuCas01Model(Model::UpdateAlgo algo) : CpuModel(algo)
  64 {
  65   bool select = config::get_value<bool>("cpu/maxmin-selective-update");
  66
  67   if (is_update_lazy()) {
  68     xbt_assert(select || config::is_default("cpu/maxmin-selective-update"),
  69                "You cannot disable cpu selective update when using the lazy update mechanism");
  70     select = true;
  71   }
  72
  73   set_maxmin_system(new lmm::System(select));
  74 }
  75
  76 Cpu* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
  77 {
  78   return (new CpuCas01(host, speed_per_pstate))->set_model(this);
  79 }
  80
  81 /************
  82  * Resource *
  83  ************/
  84 bool CpuCas01::is_used() const
  85 {
  86   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
  87 }
  88
  89 /** @brief take into account changes of speed (either load or max) */
  90 void CpuCas01::on_speed_change()
  91 {
  92   const lmm::Variable* var;
  93   const lmm::Element* elem = nullptr;
  94
  95   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
  96                                                             get_core_count() * speed_.scale * speed_.peak);
  97   while ((var = get_constraint()->get_variable(&elem))) {
  98     const CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
  99
 100     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 101                                                             action->requested_core() * speed_.scale * speed_.peak);
 102   }
 103
 104   Cpu::on_speed_change();
 105 }
 106
 107 void CpuCas01::apply_event(profile::Event* event, double value)
 108 {
 109   if (event == speed_.event) {
 110     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 111     xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 112
 113     speed_.scale = value;
 114     on_speed_change();
 115
 116     tmgr_trace_event_unref(&speed_.event);
 117   } else if (event == state_event_) {
 118     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 119     xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
 120
 121     if (value > 0) {
 122       if (not is_on()) {
 123         XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
 124         get_iface()->turn_on();
 125       }
 126     } else {
 127       const lmm::Constraint* cnst = get_constraint();
 128       const lmm::Variable* var;
 129       const lmm::Element* elem = nullptr;
 130       double date              = surf_get_clock();
 131
 132       get_iface()->turn_off();
 133
 134       while ((var = cnst->get_variable(&elem))) {
 135         Action* action = var->get_id();
 136
 137         if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
 138             action->get_state() == Action::State::IGNORED) {
 139           action->set_finish_time(date);
 140           action->set_state(Action::State::FAILED);
 141         }
 142       }
 143     }
 144     tmgr_trace_event_unref(&state_event_);
 145
 146   } else {
 147     xbt_die("Unknown event!\n");
 148   }
 149 }
 150
 151 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 152 CpuAction* CpuCas01::execution_start(double size)
 153 {
 154   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint());
 155 }
 156
 157 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
 158 {
 159   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(),
 160                             requested_cores);
 161 }
 162
 163 CpuAction* CpuCas01::sleep(double duration)
 164 {
 165   if (duration > 0)
 166     duration = std::max(duration, sg_surf_precision);
 167
 168   XBT_IN("(%s,%g)", get_cname(), duration);
 169   auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint());
 170
 171   // FIXME: sleep variables should not consume 1.0 in System::expand()
 172   action->set_max_duration(duration);
 173   action->set_suspend_state(Action::SuspendStates::SLEEPING);
 174   if (duration == NO_MAX_DURATION)
 175     action->set_state(Action::State::IGNORED);
 176
 177   get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
 178   if (get_model()->is_update_lazy()) { // remove action from the heap
 179     get_model()->get_action_heap().remove(action);
 180     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 181     // max_duration correctly at the next call to share_resources
 182     get_model()->get_modified_set()->push_front(*action);
 183   }
 184
 185   XBT_OUT();
 186   return action;
 187 }
 188
 189 /**********
 190  * Action *
 191  **********/
 192 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
 193                                int requested_core)
 194     : CpuAction(model, cost, failed,
 195                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
 196     , requested_core_(requested_core)
 197 {
 198   if (model->is_update_lazy())
 199     set_last_update();
 200   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 201 }
 202
 203 int CpuCas01Action::requested_core() const
 204 {
 205   return requested_core_;
 206 }
 207
 208 } // namespace resource
 209 } // namespace kernel
 210 } // namespace simgrid