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 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   surf_cpu_model_pm = new simgrid::surf::CpuCas01Model(cpu_optim_opt == "Lazy");
  46   all_existing_models->push_back(surf_cpu_model_pm);
  47
  48   surf_cpu_model_vm = new simgrid::surf::CpuCas01Model(cpu_optim_opt == "Lazy");
  49   all_existing_models->push_back(surf_cpu_model_vm);
  50 }
  51
  52 namespace simgrid {
  53 namespace surf {
  54
  55 CpuCas01Model::CpuCas01Model(bool optim_lazy) : simgrid::surf::CpuModel()
  56 {
  57   bool select = xbt_cfg_get_boolean("cpu/maxmin-selective-update");
  58
  59   if (optim_lazy) {
  60     xbt_assert(select || xbt_cfg_is_default_value("cpu/maxmin-selective-update"),
  61                "You cannot disable cpu selective update when using the lazy update mechanism");
  62     setUpdateMechanism(Model::UpdateAlgo::Lazy);
  63     select = true;
  64   } else {
  65     setUpdateMechanism(Model::UpdateAlgo::Full);
  66   }
  67
  68   set_maxmin_system(new simgrid::kernel::lmm::System(select));
  69
  70   if (optim_lazy)
  71     get_maxmin_system()->modified_set_ = new kernel::resource::Action::ModifiedSet();
  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 (model() == surf_cpu_model_pm)
  96     speedPerPstate_.clear();
  97 }
  98
  99 std::vector<double> * CpuCas01::getSpeedPeakList(){
 100   return &speedPerPstate_;
 101 }
 102
 103 bool CpuCas01::isUsed()
 104 {
 105   return model()->get_maxmin_system()->constraint_used(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_lmm_element_t elem = nullptr;
 112
 113   model()->get_maxmin_system()->update_constraint_bound(constraint(), coresAmount_ * speed_.scale * speed_.peak);
 114   while ((var = constraint()->get_variable(&elem))) {
 115     CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 116
 117     model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 118                                                         action->requestedCore() * speed_.scale * speed_.peak);
 119   }
 120
 121   Cpu::onSpeedChange();
 122 }
 123
 124 void CpuCas01::apply_event(tmgr_trace_event_t event, double value)
 125 {
 126   if (event == speed_.event) {
 127     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 128     xbt_assert(coresAmount_ == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 129
 130     speed_.scale = value;
 131     onSpeedChange();
 132
 133     tmgr_trace_event_unref(&speed_.event);
 134   } else if (event == stateEvent_) {
 135     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 136     xbt_assert(coresAmount_ == 1, "FIXME: add state change code also for constraint_core[i]");
 137
 138     if (value > 0) {
 139       if(isOff())
 140         host_that_restart.push_back(getHost());
 141       turnOn();
 142     } else {
 143       kernel::lmm::Constraint* cnst = constraint();
 144       kernel::lmm::Variable* var    = nullptr;
 145       const_lmm_element_t elem = nullptr;
 146       double date              = surf_get_clock();
 147
 148       turnOff();
 149
 150       while ((var = cnst->get_variable(&elem))) {
 151         kernel::resource::Action* action = static_cast<kernel::resource::Action*>(var->get_id());
 152
 153         if (action->get_state() == kernel::resource::Action::State::running ||
 154             action->get_state() == kernel::resource::Action::State::ready ||
 155             action->get_state() == kernel::resource::Action::State::not_in_the_system) {
 156           action->set_finish_time(date);
 157           action->set_state(kernel::resource::Action::State::failed);
 158         }
 159       }
 160     }
 161     tmgr_trace_event_unref(&stateEvent_);
 162
 163   } else {
 164     xbt_die("Unknown event!\n");
 165   }
 166 }
 167
 168 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 169 CpuAction* CpuCas01::execution_start(double size)
 170 {
 171   return new CpuCas01Action(model(), size, isOff(), speed_.scale * speed_.peak, constraint());
 172 }
 173
 174 CpuAction* CpuCas01::execution_start(double size, int requestedCores)
 175 {
 176   return new CpuCas01Action(model(), size, isOff(), speed_.scale * speed_.peak, constraint(), requestedCores);
 177 }
 178
 179 CpuAction *CpuCas01::sleep(double duration)
 180 {
 181   if (duration > 0)
 182     duration = std::max(duration, sg_surf_precision);
 183
 184   XBT_IN("(%s,%g)", getCname(), duration);
 185   CpuCas01Action* action = new CpuCas01Action(model(), 1.0, isOff(), speed_.scale * speed_.peak, constraint());
 186
 187   // FIXME: sleep variables should not consume 1.0 in System::expand()
 188   action->set_max_duration(duration);
 189   action->suspended_ = kernel::resource::Action::SuspendStates::sleeping;
 190   if (duration < 0) { // NO_MAX_DURATION
 191     /* Move to the *end* of the corresponding action set. This convention is used to speed up update_resource_state */
 192     simgrid::xbt::intrusive_erase(*action->get_state_set(), *action);
 193     action->state_set_ = &static_cast<CpuCas01Model*>(model())->cpuRunningActionSetThatDoesNotNeedBeingChecked_;
 194     action->get_state_set()->push_back(*action);
 195   }
 196
 197   model()->get_maxmin_system()->update_variable_weight(action->get_variable(), 0.0);
 198   if (model()->getUpdateMechanism() == kernel::resource::Model::UpdateAlgo::Lazy) { // remove action from the heap
 199     action->heapRemove();
 200     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 201     // max_duration correctly at the next call to share_resources
 202     model()->get_modified_set()->push_front(*action);
 203   }
 204
 205   XBT_OUT();
 206   return action;
 207 }
 208
 209 /**********
 210  * Action *
 211  **********/
 212 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 213                                kernel::lmm::Constraint* constraint, int requestedCore)
 214     : CpuAction(model, cost, failed,
 215                 model->get_maxmin_system()->variable_new(this, 1.0 / requestedCore, requestedCore * speed, 1))
 216     , requestedCore_(requestedCore)
 217 {
 218   if (model->getUpdateMechanism() == kernel::resource::Model::UpdateAlgo::Lazy) {
 219     set_last_update();
 220     set_last_value(0.0);
 221   }
 222   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 223 }
 224
 225 CpuCas01Action::CpuCas01Action(kernel::resource::Model* model, double cost, bool failed, double speed,
 226                                kernel::lmm::Constraint* constraint)
 227     : CpuCas01Action(model, cost, failed, speed, constraint, 1)
 228 {
 229 }
 230
 231 int CpuCas01Action::requestedCore()
 232 {
 233   return requestedCore_;
 234 }
 235
 236 CpuCas01Action::~CpuCas01Action()=default;
 237
 238 }
 239 }