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::createCpu(simgrid::s4u::Host *host, std::vector<double> *speedPerPstate, int core)
  80 {
  81   return new CpuCas01(this, host, speedPerPstate, 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()
  94 {
  95   if (get_model() == surf_cpu_model_pm)
  96     speed_per_pstate_.clear();
  97 }
  98
  99 std::vector<double> * CpuCas01::getSpeedPeakList(){
 100   return &speed_per_pstate_;
 101 }
 102
 103 bool CpuCas01::is_used()
 104 {
 105   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
 106 }
 107
 108 /** @brief take into account changes of speed (either load or max) */
 109 void CpuCas01::onSpeedChange() {
 110   kernel::lmm::Variable* var = nullptr;
 111   const kernel::lmm::Element* elem = nullptr;
 112
 113   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
 114                                                             get_cores_count() * speed_.scale * speed_.peak);
 115   while ((var = get_constraint()->get_variable(&elem))) {
 116     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 117
 118     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 119                                                             action->requested_core() * speed_.scale * speed_.peak);
 120   }
 121
 122   Cpu::onSpeedChange();
 123 }
 124
 125 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
 126 {
 127   if (event == speed_.event) {
 128     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 129     xbt_assert(get_cores_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 130
 131     speed_.scale = value;
 132     onSpeedChange();
 133
 134     tmgr_trace_event_unref(&speed_.event);
 135   } else if (event == state_event_) {
 136     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 137     xbt_assert(get_cores_count() == 1, "FIXME: add state change code also for constraint_core[i]");
 138
 139     if (value > 0) {
 140       if (is_off())
 141         host_that_restart.push_back(get_host());
 142       turn_on();
 143     } else {
 144       kernel::lmm::Constraint* cnst = get_constraint();
 145       kernel::lmm::Variable* var    = nullptr;
 146       const kernel::lmm::Element* elem = nullptr;
 147       double date              = surf_get_clock();
 148
 149       turn_off();
 150
 151       while ((var = cnst->get_variable(&elem))) {
 152         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
 153
 154         if (action->get_state() == kernel::resource::Action::State::INITED ||
 155             action->get_state() == kernel::resource::Action::State::STARTED ||
 156             action->get_state() == kernel::resource::Action::State::IGNORED) {
 157           action->set_finish_time(date);
 158           action->set_state(kernel::resource::Action::State::FAILED);
 159         }
 160       }
 161     }
 162     tmgr_trace_event_unref(&state_event_);
 163
 164   } else {
 165     xbt_die("Unknown event!\n");
 166   }
 167 }
 168
 169 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 170 CpuAction* CpuCas01::execution_start(double size)
 171 {
 172   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint());
 173 }
 174
 175 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
 176 {
 177   return new CpuCas01Action(get_model(), size, is_off(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
 178 }
 179
 180 CpuAction *CpuCas01::sleep(double duration)
 181 {
 182   if (duration > 0)
 183     duration = std::max(duration, sg_surf_precision);
 184
 185   XBT_IN("(%s,%g)", get_cname(), duration);
 186   CpuCas01Action* action = new CpuCas01Action(get_model(), 1.0, is_off(), speed_.scale * speed_.peak, get_constraint());
 187
 188   // FIXME: sleep variables should not consume 1.0 in System::expand()
 189   action->set_max_duration(duration);
 190   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
 191   if (duration < 0) // NO_MAX_DURATION
 192     action->set_state(simgrid::kernel::resource::Action::State::IGNORED);
 193
 194   get_model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
 195   if (get_model()->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::Lazy) { // remove action from the heap
 196     get_model()->get_action_heap().remove(action);
 197     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 198     // max_duration correctly at the next call to share_resources
 199     get_model()->get_modified_set()->push_front(*action);
 200   }
 201
 202   XBT_OUT();
 203   return action;
 204 }
 205
 206 /**********
 207  * Action *
 208  **********/
 209 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 210                                kernel::lmm::Constraint* constraint, int requested_core)
 211     : CpuAction(model, cost, failed,
 212                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
 213     , requested_core_(requested_core)
 214 {
 215   if (model->get_update_algorithm() == kernel::resource::Model::UpdateAlgo::Lazy)
 216     set_last_update();
 217   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 218 }
 219
 220 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 221                                kernel::lmm::Constraint* constraint)
 222     : CpuCas01Action(model, cost, failed, speed, constraint, /* requested_core */ 1)
 223 {
 224 }
 225
 226 int CpuCas01Action::requested_core()
 227 {
 228   return requested_core_;
 229 }
 230
 231 CpuCas01Action::~CpuCas01Action()=default;
 232
 233 }
 234 }