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/surf_interface.hpp"
   9 #include "surf/surf.hpp"
  10
  11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_cas, surf_cpu, "Logging specific to the SURF CPU module");
  12
  13 /***********
  14  * Options *
  15  ***********/
  16
  17 static simgrid::config::Flag<std::string>
  18     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
  19
  20                   std::map<std::string, std::string>({
  21                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
  22                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
  23                              "for the Cas01 CPU model for now)."},
  24                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
  25                   }),
  26
  27                   [](std::string const& val) {
  28                     xbt_assert(_sg_cfg_init_status < 2,
  29                                "Cannot change the optimization algorithm after the initialization");
  30                   });
  31
  32 /*********
  33  * Model *
  34  *********/
  35 void surf_cpu_model_init_Cas01()
  36 {
  37   xbt_assert(not surf_cpu_model_pm);
  38   xbt_assert(not surf_cpu_model_vm);
  39
  40   if (cpu_optim_opt == "TI") {
  41     surf_cpu_model_init_ti();
  42     return;
  43   }
  44
  45   simgrid::kernel::resource::Model::UpdateAlgo algo;
  46   if (cpu_optim_opt == "Lazy")
  47     algo = simgrid::kernel::resource::Model::UpdateAlgo::Lazy;
  48   else
  49     algo = simgrid::kernel::resource::Model::UpdateAlgo::Full;
  50
  51   surf_cpu_model_pm = new simgrid::surf::CpuCas01Model(algo);
  52   all_existing_models->push_back(surf_cpu_model_pm);
  53
  54   surf_cpu_model_vm = new simgrid::surf::CpuCas01Model(algo);
  55   all_existing_models->push_back(surf_cpu_model_vm);
  56 }
  57
  58 namespace simgrid {
  59 namespace surf {
  60
  61 CpuCas01Model::CpuCas01Model(kernel::resource::Model::UpdateAlgo algo) : simgrid::surf::CpuModel(algo)
  62 {
  63   bool select = simgrid::config::get_value<bool>("cpu/maxmin-selective-update");
  64
  65   if (algo == Model::UpdateAlgo::Lazy) {
  66     xbt_assert(select || simgrid::config::is_default("cpu/maxmin-selective-update"),
  67                "You cannot disable cpu selective update when using the lazy update mechanism");
  68     select = true;
  69   }
  70
  71   set_maxmin_system(new simgrid::kernel::lmm::System(select));
  72 }
  73
  74 CpuCas01Model::~CpuCas01Model()
  75 {
  76   surf_cpu_model_pm = nullptr;
  77 }
  78
  79 Cpu* CpuCas01Model::create_cpu(simgrid::s4u::Host* host, std::vector<double>* speed_per_pstate, int core)
  80 {
  81   return new CpuCas01(this, host, speed_per_pstate, core);
  82 }
  83
  84 /************
  85  * Resource *
  86  ************/
  87 CpuCas01::CpuCas01(CpuCas01Model* model, simgrid::s4u::Host* host, std::vector<double>* speedPerPstate, int core)
  88     : Cpu(model, host, model->get_maxmin_system()->constraint_new(this, core * speedPerPstate->front()), speedPerPstate,
  89           core)
  90 {
  91 }
  92
  93 CpuCas01::~CpuCas01() = default;
  94
  95 bool CpuCas01::is_used()
  96 {
  97   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
  98 }
  99
 100 /** @brief take into account changes of speed (either load or max) */
 101 void CpuCas01::onSpeedChange() {
 102   kernel::lmm::Variable* var = nullptr;
 103   const kernel::lmm::Element* elem = nullptr;
 104
 105   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
 106                                                             get_cores_count() * speed_.scale * speed_.peak);
 107   while ((var = get_constraint()->get_variable(&elem))) {
 108     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 109
 110     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 111                                                             action->requested_core() * speed_.scale * speed_.peak);
 112   }
 113
 114   Cpu::onSpeedChange();
 115 }
 116
 117 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
 118 {
 119   if (event == speed_.event) {
 120     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 121     xbt_assert(get_cores_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 122
 123     speed_.scale = value;
 124     onSpeedChange();
 125
 126     tmgr_trace_event_unref(&speed_.event);
 127   } else if (event == state_event_) {
 128     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 129     xbt_assert(get_cores_count() == 1, "FIXME: add state change code also for constraint_core[i]");
 130
 131     if (value > 0) {
 132       if (is_off())
 133         host_that_restart.push_back(get_host());
 134       turn_on();
 135     } else {
 136       kernel::lmm::Constraint* cnst = get_constraint();
 137       kernel::lmm::Variable* var    = nullptr;
 138       const kernel::lmm::Element* elem = nullptr;
 139       double date              = surf_get_clock();
 140
 141       turn_off();
 142
 143       while ((var = cnst->get_variable(&elem))) {
 144         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
 145
 146         if (action->get_state() == kernel::resource::Action::State::INITED ||
 147             action->get_state() == kernel::resource::Action::State::STARTED ||
 148             action->get_state() == kernel::resource::Action::State::IGNORED) {
 149           action->set_finish_time(date);
 150           action->set_state(kernel::resource::Action::State::FAILED);
 151         }
 152       }
 153     }
 154     tmgr_trace_event_unref(&state_event_);
 155
 156   } else {
 157     xbt_die("Unknown event!\n");
 158   }
 159 }
 160
 161 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 162 CpuAction* CpuCas01::execution_start(double size)
 163 {
 164   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint());
 165 }
 166
 167 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
 168 {
 169   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
 170 }
 171
 172 CpuAction *CpuCas01::sleep(double duration)
 173 {
 174   if (duration > 0)
 175     duration = std::max(duration, sg_surf_precision);
 176
 177   XBT_IN("(%s,%g)", get_cname(), duration);
 178   CpuCas01Action* action = new CpuCas01Action(get_model(), 1.0, is_off(), speed_.scale * speed_.peak, get_constraint());
 179
 180   // FIXME: sleep variables should not consume 1.0 in System::expand()
 181   action->set_max_duration(duration);
 182   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
 183   if (duration < 0) // NO_MAX_DURATION
 184     action->set_state(simgrid::kernel::resource::Action::State::IGNORED);
 185
 186   get_model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
 187   if (get_model()->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::Lazy) { // remove action from the heap
 188     get_model()->get_action_heap().remove(action);
 189     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 190     // max_duration correctly at the next call to share_resources
 191     get_model()->get_modified_set()->push_front(*action);
 192   }
 193
 194   XBT_OUT();
 195   return action;
 196 }
 197
 198 /**********
 199  * Action *
 200  **********/
 201 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 202                                kernel::lmm::Constraint* constraint, int requested_core)
 203     : CpuAction(model, cost, failed,
 204                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
 205     , requested_core_(requested_core)
 206 {
 207   if (model->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::Lazy)
 208     set_last_update();
 209   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 210 }
 211
 212 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 213                                kernel::lmm::Constraint* constraint)
 214     : CpuCas01Action(model, cost, failed, speed, constraint, /* requested_core */ 1)
 215 {
 216 }
 217
 218 int CpuCas01Action::requested_core()
 219 {
 220   return requested_core_;
 221 }
 222
 223 CpuCas01Action::~CpuCas01Action()=default;
 224
 225 }
 226 }