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   if (algo == Model::UpdateAlgo::Lazy)
  78     get_maxmin_system()->modified_set_ = new kernel::resource::Action::ModifiedSet();
  79 }
  80
  81 CpuCas01Model::~CpuCas01Model()
  82 {
  83   surf_cpu_model_pm = nullptr;
  84 }
  85
  86 Cpu *CpuCas01Model::createCpu(simgrid::s4u::Host *host, std::vector<double> *speedPerPstate, int core)
  87 {
  88   return new CpuCas01(this, host, speedPerPstate, core);
  89 }
  90
  91 /************
  92  * Resource *
  93  ************/
  94 CpuCas01::CpuCas01(CpuCas01Model* model, simgrid::s4u::Host* host, std::vector<double>* speedPerPstate, int core)
  95     : Cpu(model, host, model->get_maxmin_system()->constraint_new(this, core * speedPerPstate->front()), speedPerPstate,
  96           core)
  97 {
  98 }
  99
 100 CpuCas01::~CpuCas01()
 101 {
 102   if (model() == surf_cpu_model_pm)
 103     speedPerPstate_.clear();
 104 }
 105
 106 std::vector<double> * CpuCas01::getSpeedPeakList(){
 107   return &speedPerPstate_;
 108 }
 109
 110 bool CpuCas01::isUsed()
 111 {
 112   return model()->get_maxmin_system()->constraint_used(constraint());
 113 }
 114
 115 /** @brief take into account changes of speed (either load or max) */
 116 void CpuCas01::onSpeedChange() {
 117   kernel::lmm::Variable* var = nullptr;
 118   const_lmm_element_t elem = nullptr;
 119
 120   model()->get_maxmin_system()->update_constraint_bound(constraint(), coresAmount_ * speed_.scale * speed_.peak);
 121   while ((var = constraint()->get_variable(&elem))) {
 122     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 123
 124     model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 125                                                         action->requestedCore() * speed_.scale * speed_.peak);
 126   }
 127
 128   Cpu::onSpeedChange();
 129 }
 130
 131 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
 132 {
 133   if (event == speed_.event) {
 134     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 135     xbt_assert(coresAmount_ == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 136
 137     speed_.scale = value;
 138     onSpeedChange();
 139
 140     tmgr_trace_event_unref(&speed_.event);
 141   } else if (event == stateEvent_) {
 142     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 143     xbt_assert(coresAmount_ == 1, "FIXME: add state change code also for constraint_core[i]");
 144
 145     if (value > 0) {
 146       if(isOff())
 147         host_that_restart.push_back(getHost());
 148       turnOn();
 149     } else {
 150       kernel::lmm::Constraint* cnst = constraint();
 151       kernel::lmm::Variable* var    = nullptr;
 152       const_lmm_element_t elem = nullptr;
 153       double date              = surf_get_clock();
 154
 155       turnOff();
 156
 157       while ((var = cnst->get_variable(&elem))) {
 158         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
 159
 160         if (action->get_state() == kernel::resource::Action::State::running ||
 161             action->get_state() == kernel::resource::Action::State::ready ||
 162             action->get_state() == kernel::resource::Action::State::not_in_the_system) {
 163           action->set_finish_time(date);
 164           action->set_state(kernel::resource::Action::State::failed);
 165         }
 166       }
 167     }
 168     tmgr_trace_event_unref(&stateEvent_);
 169
 170   } else {
 171     xbt_die("Unknown event!\n");
 172   }
 173 }
 174
 175 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 176 CpuAction* CpuCas01::execution_start(double size)
 177 {
 178   return new CpuCas01Action(model(), size, isOff(), speed_.scale * speed_.peak, constraint());
 179 }
 180
 181 CpuAction* CpuCas01::execution_start(double size, int requestedCores)
 182 {
 183   return new CpuCas01Action(model(), size, isOff(), speed_.scale * speed_.peak, constraint(), requestedCores);
 184 }
 185
 186 CpuAction *CpuCas01::sleep(double duration)
 187 {
 188   if (duration > 0)
 189     duration = std::max(duration, sg_surf_precision);
 190
 191   XBT_IN("(%s,%g)", getCname(), duration);
 192   CpuCas01Action* action = new CpuCas01Action(model(), 1.0, isOff(), speed_.scale * speed_.peak, constraint());
 193
 194   // FIXME: sleep variables should not consume 1.0 in System::expand()
 195   action->set_max_duration(duration);
 196   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
 197   if (duration < 0) { // NO_MAX_DURATION
 198     /* Move to the *end* of the corresponding action set. This convention is used to speed up update_resource_state */
 199     simgrid::xbt::intrusive_erase(*action->get_state_set(), *action);
 200     action->state_set_ = &static_cast<CpuCas01Model*>(model())->cpuRunningActionSetThatDoesNotNeedBeingChecked_;
 201     action->get_state_set()->push_back(*action);
 202   }
 203
 204   model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
 205   if (model()->getUpdateMechanism() == kernel::resource::Model::UpdateAlgo::Lazy) { // remove action from the heap
 206     action->heapRemove();
 207     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 208     // max_duration correctly at the next call to share_resources
 209     model()->get_modified_set()->push_front(*action);
 210   }
 211
 212   XBT_OUT();
 213   return action;
 214 }
 215
 216 /**********
 217  * Action *
 218  **********/
 219 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 220                                kernel::lmm::Constraint* constraint, int requestedCore)
 221     : CpuAction(model, cost, failed,
 222                 model->get_maxmin_system()->variable_new(this, 1.0 / requestedCore, requestedCore * speed, 1))
 223     , requestedCore_(requestedCore)
 224 {
 225   if (model->getUpdateMechanism() == kernel::resource::Model::UpdateAlgo::Lazy) {
 226     set_last_update();
 227     set_last_value(0.0);
 228   }
 229   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 230 }
 231
 232 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 233                                kernel::lmm::Constraint* constraint)
 234     : CpuCas01Action(model, cost, failed, speed, constraint, 1)
 235 {
 236 }
 237
 238 int CpuCas01Action::requestedCore()
 239 {
 240   return requestedCore_;
 241 }
 242
 243 CpuCas01Action::~CpuCas01Action()=default;
 244
 245 }
 246 }