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/sg_config.hpp"
   8 #include "src/kernel/resource/profile/Event.hpp"
   9 #include "src/surf/cpu_ti.hpp"
  10 #include "src/surf/surf_interface.hpp"
  11 #include "surf/surf.hpp"
  12
  13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
  14
  15 /***********
  16  * Options *
  17  ***********/
  18
  19 static simgrid::config::Flag<std::string>
  20     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
  21
  22                   std::map<std::string, std::string, std::less<>>({
  23                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
  24                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
  25                              "for the Cas01 CPU model for now)."},
  26                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
  27                   }),
  28
  29                   [](std::string const&) {
  30                     xbt_assert(_sg_cfg_init_status < 2,
  31                                "Cannot change the optimization algorithm after the initialization");
  32                   });
  33
  34 /*********
  35  * Model *
  36  *********/
  37 void surf_cpu_model_init_Cas01()
  38 {
  39   if (cpu_optim_opt == "TI") {
  40     simgrid::kernel::resource::CpuTiModel::create_pm_vm_models();
  41     return;
  42   }
  43
  44   simgrid::kernel::resource::Model::UpdateAlgo algo;
  45   if (cpu_optim_opt == "Lazy")
  46     algo = simgrid::kernel::resource::Model::UpdateAlgo::LAZY;
  47   else
  48     algo = simgrid::kernel::resource::Model::UpdateAlgo::FULL;
  49
  50   auto cpu_model_pm = new simgrid::kernel::resource::CpuCas01Model(algo);
  51   models_by_type[simgrid::kernel::resource::Model::Type::CPU_PM].push_back(cpu_model_pm);
  52   auto cpu_model_vm = new simgrid::kernel::resource::CpuCas01Model(algo);
  53   models_by_type[simgrid::kernel::resource::Model::Type::CPU_VM].push_back(cpu_model_vm);
  54 }
  55
  56 namespace simgrid {
  57 namespace kernel {
  58 namespace resource {
  59
  60 CpuCas01Model::CpuCas01Model(Model::UpdateAlgo algo) : CpuModel(algo)
  61 {
  62   all_existing_models.push_back(this);
  63
  64   bool select = config::get_value<bool>("cpu/maxmin-selective-update");
  65
  66   if (is_update_lazy()) {
  67     xbt_assert(select || config::is_default("cpu/maxmin-selective-update"),
  68                "You cannot disable cpu selective update when using the lazy update mechanism");
  69     select = true;
  70   }
  71
  72   set_maxmin_system(new lmm::System(select));
  73 }
  74
  75 CpuCas01Model::~CpuCas01Model()
  76 {
  77 }
  78
  79 Cpu* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
  80 {
  81   return (new CpuCas01(host, speed_per_pstate))->set_model(this);
  82 }
  83
  84 /************
  85  * Resource *
  86  ************/
  87 bool CpuCas01::is_used() const
  88 {
  89   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
  90 }
  91
  92 /** @brief take into account changes of speed (either load or max) */
  93 void CpuCas01::on_speed_change()
  94 {
  95   const lmm::Variable* var;
  96   const lmm::Element* elem = nullptr;
  97
  98   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
  99                                                             get_core_count() * speed_.scale * speed_.peak);
 100   while ((var = get_constraint()->get_variable(&elem))) {
 101     const CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 102
 103     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 104                                                             action->requested_core() * speed_.scale * speed_.peak);
 105   }
 106
 107   Cpu::on_speed_change();
 108 }
 109
 110 void CpuCas01::apply_event(profile::Event* event, double value)
 111 {
 112   if (event == speed_.event) {
 113     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 114     xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 115
 116     speed_.scale = value;
 117     on_speed_change();
 118
 119     tmgr_trace_event_unref(&speed_.event);
 120   } else if (event == state_event_) {
 121     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 122     xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
 123
 124     if (value > 0) {
 125       if (not is_on()) {
 126         XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
 127         get_iface()->turn_on();
 128       }
 129     } else {
 130       const lmm::Constraint* cnst = get_constraint();
 131       const lmm::Variable* var;
 132       const lmm::Element* elem = nullptr;
 133       double date              = surf_get_clock();
 134
 135       get_iface()->turn_off();
 136
 137       while ((var = cnst->get_variable(&elem))) {
 138         Action* action = var->get_id();
 139
 140         if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
 141             action->get_state() == Action::State::IGNORED) {
 142           action->set_finish_time(date);
 143           action->set_state(Action::State::FAILED);
 144         }
 145       }
 146     }
 147     tmgr_trace_event_unref(&state_event_);
 148
 149   } else {
 150     xbt_die("Unknown event!\n");
 151   }
 152 }
 153
 154 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 155 CpuAction* CpuCas01::execution_start(double size)
 156 {
 157   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint());
 158 }
 159
 160 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
 161 {
 162   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(),
 163                             requested_cores);
 164 }
 165
 166 CpuAction* CpuCas01::sleep(double duration)
 167 {
 168   if (duration > 0)
 169     duration = std::max(duration, sg_surf_precision);
 170
 171   XBT_IN("(%s,%g)", get_cname(), duration);
 172   auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint());
 173
 174   // FIXME: sleep variables should not consume 1.0 in System::expand()
 175   action->set_max_duration(duration);
 176   action->set_suspend_state(Action::SuspendStates::SLEEPING);
 177   if (duration == NO_MAX_DURATION)
 178     action->set_state(Action::State::IGNORED);
 179
 180   get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
 181   if (get_model()->is_update_lazy()) { // remove action from the heap
 182     get_model()->get_action_heap().remove(action);
 183     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 184     // max_duration correctly at the next call to share_resources
 185     get_model()->get_modified_set()->push_front(*action);
 186   }
 187
 188   XBT_OUT();
 189   return action;
 190 }
 191
 192 /**********
 193  * Action *
 194  **********/
 195 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
 196                                int requested_core)
 197     : CpuAction(model, cost, failed,
 198                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
 199     , requested_core_(requested_core)
 200 {
 201   if (model->is_update_lazy())
 202     set_last_update();
 203   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 204 }
 205
 206 int CpuCas01Action::requested_core() const
 207 {
 208   return requested_core_;
 209 }
 210
 211 CpuCas01Action::~CpuCas01Action() = default;
 212
 213 } // namespace resource
 214 } // namespace kernel
 215 } // namespace simgrid