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 "cpu_ti.hpp"
   8 #include "simgrid/sg_config.hpp"
   9 #include "src/kernel/lmm/maxmin.hpp"
  10 #include "xbt/config.hpp"
  11 #include "xbt/utility.hpp"
  12
  13 #include <algorithm>
  14
  15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_cas, surf_cpu, "Logging specific to the SURF CPU module");
  16
  17 /***********
  18  * Options *
  19  ***********/
  20
  21 static simgrid::config::Flag<std::string>
  22     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
  23
  24                   std::map<std::string, std::string>({
  25                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
  26                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
  27                              "for the Cas01 CPU model for now)."},
  28                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
  29                   }),
  30
  31                   [](std::string const& val) {
  32                     xbt_assert(_sg_cfg_init_status < 2,
  33                                "Cannot change the optimization algorithm after the initialization");
  34                   });
  35
  36 /*********
  37  * Model *
  38  *********/
  39 void surf_cpu_model_init_Cas01()
  40 {
  41   xbt_assert(not surf_cpu_model_pm);
  42   xbt_assert(not surf_cpu_model_vm);
  43
  44   if (cpu_optim_opt == "TI") {
  45     surf_cpu_model_init_ti();
  46     return;
  47   }
  48
  49   simgrid::kernel::resource::Model::UpdateAlgo algo;
  50   if (cpu_optim_opt == "Lazy")
  51     algo = simgrid::kernel::resource::Model::UpdateAlgo::Lazy;
  52   else
  53     algo = simgrid::kernel::resource::Model::UpdateAlgo::Full;
  54
  55   surf_cpu_model_pm = new simgrid::surf::CpuCas01Model(algo);
  56   all_existing_models->push_back(surf_cpu_model_pm);
  57
  58   surf_cpu_model_vm = new simgrid::surf::CpuCas01Model(algo);
  59   all_existing_models->push_back(surf_cpu_model_vm);
  60 }
  61
  62 namespace simgrid {
  63 namespace surf {
  64
  65 CpuCas01Model::CpuCas01Model(kernel::resource::Model::UpdateAlgo algo) : simgrid::surf::CpuModel(algo)
  66 {
  67   bool select = xbt_cfg_get_boolean("cpu/maxmin-selective-update");
  68
  69   if (algo == Model::UpdateAlgo::Lazy) {
  70     xbt_assert(select || xbt_cfg_is_default_value("cpu/maxmin-selective-update"),
  71                "You cannot disable cpu selective update when using the lazy update mechanism");
  72     select = true;
  73   }
  74
  75   set_maxmin_system(new simgrid::kernel::lmm::System(select));
  76 }
  77
  78 CpuCas01Model::~CpuCas01Model()
  79 {
  80   surf_cpu_model_pm = nullptr;
  81 }
  82
  83 Cpu *CpuCas01Model::createCpu(simgrid::s4u::Host *host, std::vector<double> *speedPerPstate, int core)
  84 {
  85   return new CpuCas01(this, host, speedPerPstate, core);
  86 }
  87
  88 /************
  89  * Resource *
  90  ************/
  91 CpuCas01::CpuCas01(CpuCas01Model* model, simgrid::s4u::Host* host, std::vector<double>* speedPerPstate, int core)
  92     : Cpu(model, host, model->get_maxmin_system()->constraint_new(this, core * speedPerPstate->front()), speedPerPstate,
  93           core)
  94 {
  95 }
  96
  97 CpuCas01::~CpuCas01()
  98 {
  99   if (model() == surf_cpu_model_pm)
 100     speedPerPstate_.clear();
 101 }
 102
 103 std::vector<double> * CpuCas01::getSpeedPeakList(){
 104   return &speedPerPstate_;
 105 }
 106
 107 bool CpuCas01::is_used()
 108 {
 109   return model()->get_maxmin_system()->constraint_used(constraint());
 110 }
 111
 112 /** @brief take into account changes of speed (either load or max) */
 113 void CpuCas01::onSpeedChange() {
 114   kernel::lmm::Variable* var = nullptr;
 115   const_lmm_element_t elem = nullptr;
 116
 117   model()->get_maxmin_system()->update_constraint_bound(constraint(), coresAmount_ * speed_.scale * speed_.peak);
 118   while ((var = constraint()->get_variable(&elem))) {
 119     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 120
 121     model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 122                                                         action->requestedCore() * speed_.scale * speed_.peak);
 123   }
 124
 125   Cpu::onSpeedChange();
 126 }
 127
 128 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
 129 {
 130   if (event == speed_.event) {
 131     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 132     xbt_assert(coresAmount_ == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 133
 134     speed_.scale = value;
 135     onSpeedChange();
 136
 137     tmgr_trace_event_unref(&speed_.event);
 138   } else if (event == stateEvent_) {
 139     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 140     xbt_assert(coresAmount_ == 1, "FIXME: add state change code also for constraint_core[i]");
 141
 142     if (value > 0) {
 143       if(isOff())
 144         host_that_restart.push_back(getHost());
 145       turnOn();
 146     } else {
 147       kernel::lmm::Constraint* cnst = constraint();
 148       kernel::lmm::Variable* var    = nullptr;
 149       const_lmm_element_t elem = nullptr;
 150       double date              = surf_get_clock();
 151
 152       turnOff();
 153
 154       while ((var = cnst->get_variable(&elem))) {
 155         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
 156
 157         if (action->get_state() == kernel::resource::Action::State::running ||
 158             action->get_state() == kernel::resource::Action::State::ready ||
 159             action->get_state() == kernel::resource::Action::State::not_in_the_system) {
 160           action->set_finish_time(date);
 161           action->set_state(kernel::resource::Action::State::failed);
 162         }
 163       }
 164     }
 165     tmgr_trace_event_unref(&stateEvent_);
 166
 167   } else {
 168     xbt_die("Unknown event!\n");
 169   }
 170 }
 171
 172 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 173 CpuAction* CpuCas01::execution_start(double size)
 174 {
 175   return new CpuCas01Action(model(), size, isOff(), speed_.scale * speed_.peak, constraint());
 176 }
 177
 178 CpuAction* CpuCas01::execution_start(double size, int requestedCores)
 179 {
 180   return new CpuCas01Action(model(), size, isOff(), speed_.scale * speed_.peak, constraint(), requestedCores);
 181 }
 182
 183 CpuAction *CpuCas01::sleep(double duration)
 184 {
 185   if (duration > 0)
 186     duration = std::max(duration, sg_surf_precision);
 187
 188   XBT_IN("(%s,%g)", getCname(), duration);
 189   CpuCas01Action* action = new CpuCas01Action(model(), 1.0, isOff(), speed_.scale * speed_.peak, constraint());
 190
 191   // FIXME: sleep variables should not consume 1.0 in System::expand()
 192   action->set_max_duration(duration);
 193   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
 194   if (duration < 0) { // NO_MAX_DURATION
 195     /* Move to the *end* of the corresponding action set. This convention is used to speed up update_resource_state */
 196     simgrid::xbt::intrusive_erase(*action->get_state_set(), *action);
 197     action->state_set_ = &static_cast<CpuCas01Model*>(model())->cpuRunningActionSetThatDoesNotNeedBeingChecked_;
 198     action->get_state_set()->push_back(*action);
 199   }
 200
 201   model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
 202   if (model()->getUpdateMechanism() == kernel::resource::Model::UpdateAlgo::Lazy) { // remove action from the heap
 203     action->heapRemove();
 204     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 205     // max_duration correctly at the next call to share_resources
 206     model()->get_modified_set()->push_front(*action);
 207   }
 208
 209   XBT_OUT();
 210   return action;
 211 }
 212
 213 /**********
 214  * Action *
 215  **********/
 216 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 217                                kernel::lmm::Constraint* constraint, int requestedCore)
 218     : CpuAction(model, cost, failed,
 219                 model->get_maxmin_system()->variable_new(this, 1.0 / requestedCore, requestedCore * speed, 1))
 220     , requestedCore_(requestedCore)
 221 {
 222   if (model->getUpdateMechanism() == kernel::resource::Model::UpdateAlgo::Lazy) {
 223     set_last_update();
 224     set_last_value(0.0);
 225   }
 226   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 227 }
 228
 229 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 230                                kernel::lmm::Constraint* constraint)
 231     : CpuCas01Action(model, cost, failed, speed, constraint, 1)
 232 {
 233 }
 234
 235 int CpuCas01Action::requestedCore()
 236 {
 237   return requestedCore_;
 238 }
 239
 240 CpuCas01Action::~CpuCas01Action()=default;
 241
 242 }
 243 }