src/surf/cpu_cas01.cpp

   1 /* Copyright (c) 2009-2018. 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/surf/cpu_ti.hpp"
   9 #include "src/surf/surf_interface.hpp"
  10 #include "surf/surf.hpp"
  11
  12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_cas, surf_cpu, "Logging specific to the SURF CPU module");
  13
  14 /***********
  15  * Options *
  16  ***********/
  17
  18 static simgrid::config::Flag<std::string>
  19     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
  20
  21                   std::map<std::string, std::string>({
  22                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
  23                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
  24                              "for the Cas01 CPU model for now)."},
  25                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
  26                   }),
  27
  28                   [](std::string const& val) {
  29                     xbt_assert(_sg_cfg_init_status < 2,
  30                                "Cannot change the optimization algorithm after the initialization");
  31                   });
  32
  33 /*********
  34  * Model *
  35  *********/
  36 void surf_cpu_model_init_Cas01()
  37 {
  38   xbt_assert(surf_cpu_model_pm == nullptr, "CPU model already initialized. This should not happen.");
  39   xbt_assert(surf_cpu_model_vm == nullptr, "CPU model already initialized. This should not happen.");
  40
  41   if (cpu_optim_opt == "TI") {
  42     simgrid::surf::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::surf::CpuCas01Model(algo);
  53   all_existing_models.push_back(surf_cpu_model_pm);
  54
  55   surf_cpu_model_vm = new simgrid::surf::CpuCas01Model(algo);
  56   all_existing_models.push_back(surf_cpu_model_vm);
  57 }
  58
  59 namespace simgrid {
  60 namespace surf {
  61
  62 CpuCas01Model::CpuCas01Model(kernel::resource::Model::UpdateAlgo algo) : simgrid::surf::CpuModel(algo)
  63 {
  64   bool select = simgrid::config::get_value<bool>("cpu/maxmin-selective-update");
  65
  66   if (algo == Model::UpdateAlgo::LAZY) {
  67     xbt_assert(select || simgrid::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 simgrid::kernel::lmm::System(select));
  73 }
  74
  75 CpuCas01Model::~CpuCas01Model()
  76 {
  77   surf_cpu_model_pm = nullptr;
  78 }
  79
  80 Cpu* CpuCas01Model::create_cpu(simgrid::s4u::Host* host, std::vector<double>* speed_per_pstate, int core)
  81 {
  82   return new CpuCas01(this, host, speed_per_pstate, core);
  83 }
  84
  85 /************
  86  * Resource *
  87  ************/
  88 CpuCas01::CpuCas01(CpuCas01Model* model, simgrid::s4u::Host* host, std::vector<double>* speedPerPstate, int core)
  89     : Cpu(model, host, model->get_maxmin_system()->constraint_new(this, core * speedPerPstate->front()), speedPerPstate,
  90           core)
  91 {
  92 }
  93
  94 CpuCas01::~CpuCas01() = default;
  95
  96 bool CpuCas01::is_used()
  97 {
  98   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
  99 }
 100
 101 /** @brief take into account changes of speed (either load or max) */
 102 void CpuCas01::on_speed_change()
 103 {
 104   kernel::lmm::Variable* var = nullptr;
 105   const kernel::lmm::Element* elem = nullptr;
 106
 107   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
 108                                                             get_core_count() * speed_.scale * speed_.peak);
 109   while ((var = get_constraint()->get_variable(&elem))) {
 110     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 111
 112     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 113                                                             action->requested_core() * speed_.scale * speed_.peak);
 114   }
 115
 116   Cpu::on_speed_change();
 117 }
 118
 119 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
 120 {
 121   if (event == speed_.event) {
 122     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 123     xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 124
 125     speed_.scale = value;
 126     on_speed_change();
 127
 128     tmgr_trace_event_unref(&speed_.event);
 129   } else if (event == state_event_) {
 130     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 131     xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
 132
 133     if (value > 0) {
 134       if (is_off())
 135         host_that_restart.push_back(get_host());
 136       turn_on();
 137     } else {
 138       kernel::lmm::Constraint* cnst = get_constraint();
 139       kernel::lmm::Variable* var    = nullptr;
 140       const kernel::lmm::Element* elem = nullptr;
 141       double date              = surf_get_clock();
 142
 143       turn_off();
 144
 145       while ((var = cnst->get_variable(&elem))) {
 146         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
 147
 148         if (action->get_state() == kernel::resource::Action::State::INITED ||
 149             action->get_state() == kernel::resource::Action::State::STARTED ||
 150             action->get_state() == kernel::resource::Action::State::IGNORED) {
 151           action->set_finish_time(date);
 152           action->set_state(kernel::resource::Action::State::FAILED);
 153         }
 154       }
 155     }
 156     tmgr_trace_event_unref(&state_event_);
 157
 158   } else {
 159     xbt_die("Unknown event!\n");
 160   }
 161 }
 162
 163 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 164 CpuAction* CpuCas01::execution_start(double size)
 165 {
 166   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint());
 167 }
 168
 169 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
 170 {
 171   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
 172 }
 173
 174 CpuAction *CpuCas01::sleep(double duration)
 175 {
 176   if (duration > 0)
 177     duration = std::max(duration, sg_surf_precision);
 178
 179   XBT_IN("(%s,%g)", get_cname(), duration);
 180   CpuCas01Action* action = new CpuCas01Action(get_model(), 1.0, is_off(), speed_.scale * speed_.peak, get_constraint());
 181
 182   // FIXME: sleep variables should not consume 1.0 in System::expand()
 183   action->set_max_duration(duration);
 184   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
 185   if (duration < 0) // NO_MAX_DURATION
 186     action->set_state(simgrid::kernel::resource::Action::State::IGNORED);
 187
 188   get_model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
 189   if (get_model()->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::LAZY) { // remove action from the heap
 190     get_model()->get_action_heap().remove(action);
 191     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 192     // max_duration correctly at the next call to share_resources
 193     get_model()->get_modified_set()->push_front(*action);
 194   }
 195
 196   XBT_OUT();
 197   return action;
 198 }
 199
 200 /**********
 201  * Action *
 202  **********/
 203 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 204                                kernel::lmm::Constraint* constraint, int requested_core)
 205     : CpuAction(model, cost, failed,
 206                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
 207     , requested_core_(requested_core)
 208 {
 209   if (model->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::LAZY)
 210     set_last_update();
 211   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 212 }
 213
 214 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 215                                kernel::lmm::Constraint* constraint)
 216     : CpuCas01Action(model, cost, failed, speed, constraint, /* requested_core */ 1)
 217 {
 218 }
 219
 220 int CpuCas01Action::requested_core()
 221 {
 222   return requested_core_;
 223 }
 224
 225 CpuCas01Action::~CpuCas01Action()=default;
 226
 227 }
 228 }