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