src/surf/cpu_cas01.cpp

   1 /* Copyright (c) 2009-2021. 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/kernel/EngineImpl.hpp"
   9 #include "src/kernel/resource/profile/Event.hpp"
  10 #include "src/surf/cpu_ti.hpp"
  11 #include "src/surf/surf_interface.hpp"
  12 #include "surf/surf.hpp"
  13
  14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
  15
  16 /***********
  17  * Options *
  18  ***********/
  19
  20 static simgrid::config::Flag<std::string>
  21     cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
  22
  23                   std::map<std::string, std::string, std::less<>>({
  24                       {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
  25                       {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
  26                              "for the Cas01 CPU model for now)."},
  27                       {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
  28                   }),
  29
  30                   [](std::string const&) {
  31                     xbt_assert(_sg_cfg_init_status < 2,
  32                                "Cannot change the optimization algorithm after the initialization");
  33                   });
  34
  35 /*********
  36  * Model *
  37  *********/
  38 void surf_cpu_model_init_Cas01()
  39 {
  40   if (cpu_optim_opt == "TI") {
  41     simgrid::kernel::resource::CpuTiModel::create_pm_vm_models();
  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   auto cpu_model_pm = std::make_unique<simgrid::kernel::resource::CpuCas01Model>(algo);
  52   simgrid::kernel::EngineImpl::get_instance()->add_model(simgrid::kernel::resource::Model::Type::CPU_PM,
  53                                                          std::move(cpu_model_pm), true);
  54   auto cpu_model_vm = std::make_unique<simgrid::kernel::resource::CpuCas01Model>(algo);
  55   simgrid::kernel::EngineImpl::get_instance()->add_model(simgrid::kernel::resource::Model::Type::CPU_VM,
  56                                                          std::move(cpu_model_vm), true);
  57 }
  58
  59 namespace simgrid {
  60 namespace kernel {
  61 namespace resource {
  62
  63 CpuCas01Model::CpuCas01Model(Model::UpdateAlgo algo) : CpuModel(algo)
  64 {
  65   bool select = config::get_value<bool>("cpu/maxmin-selective-update");
  66
  67   if (is_update_lazy()) {
  68     xbt_assert(select || config::is_default("cpu/maxmin-selective-update"),
  69                "You cannot disable cpu selective update when using the lazy update mechanism");
  70     select = true;
  71   }
  72
  73   set_maxmin_system(new lmm::System(select));
  74 }
  75
  76 CpuCas01Model::~CpuCas01Model() {}
  77
  78 Cpu* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
  79 {
  80   return (new CpuCas01(host, speed_per_pstate))->set_model(this);
  81 }
  82
  83 /************
  84  * Resource *
  85  ************/
  86 bool CpuCas01::is_used() const
  87 {
  88   return get_model()->get_maxmin_system()->constraint_used(get_constraint());
  89 }
  90
  91 /** @brief take into account changes of speed (either load or max) */
  92 void CpuCas01::on_speed_change()
  93 {
  94   const lmm::Variable* var;
  95   const lmm::Element* elem = nullptr;
  96
  97   get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
  98                                                             get_core_count() * speed_.scale * speed_.peak);
  99   while ((var = get_constraint()->get_variable(&elem))) {
 100     const CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
 101
 102     get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
 103                                                             action->requested_core() * speed_.scale * speed_.peak);
 104   }
 105
 106   Cpu::on_speed_change();
 107 }
 108
 109 void CpuCas01::apply_event(profile::Event* event, double value)
 110 {
 111   if (event == speed_.event) {
 112     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 113     xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
 114
 115     speed_.scale = value;
 116     on_speed_change();
 117
 118     tmgr_trace_event_unref(&speed_.event);
 119   } else if (event == state_event_) {
 120     /* TODO (Hypervisor): do the same thing for constraint_core[i] */
 121     xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
 122
 123     if (value > 0) {
 124       if (not is_on()) {
 125         XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
 126         get_iface()->turn_on();
 127       }
 128     } else {
 129       const lmm::Constraint* cnst = get_constraint();
 130       const lmm::Variable* var;
 131       const lmm::Element* elem = nullptr;
 132       double date              = surf_get_clock();
 133
 134       get_iface()->turn_off();
 135
 136       while ((var = cnst->get_variable(&elem))) {
 137         Action* action = var->get_id();
 138
 139         if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
 140             action->get_state() == Action::State::IGNORED) {
 141           action->set_finish_time(date);
 142           action->set_state(Action::State::FAILED);
 143         }
 144       }
 145     }
 146     tmgr_trace_event_unref(&state_event_);
 147
 148   } else {
 149     xbt_die("Unknown event!\n");
 150   }
 151 }
 152
 153 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
 154 CpuAction* CpuCas01::execution_start(double size)
 155 {
 156   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint());
 157 }
 158
 159 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
 160 {
 161   return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(),
 162                             requested_cores);
 163 }
 164
 165 CpuAction* CpuCas01::sleep(double duration)
 166 {
 167   if (duration > 0)
 168     duration = std::max(duration, sg_surf_precision);
 169
 170   XBT_IN("(%s,%g)", get_cname(), duration);
 171   auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint());
 172
 173   // FIXME: sleep variables should not consume 1.0 in System::expand()
 174   action->set_max_duration(duration);
 175   action->set_suspend_state(Action::SuspendStates::SLEEPING);
 176   if (duration == NO_MAX_DURATION)
 177     action->set_state(Action::State::IGNORED);
 178
 179   get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
 180   if (get_model()->is_update_lazy()) { // remove action from the heap
 181     get_model()->get_action_heap().remove(action);
 182     // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
 183     // max_duration correctly at the next call to share_resources
 184     get_model()->get_modified_set()->push_front(*action);
 185   }
 186
 187   XBT_OUT();
 188   return action;
 189 }
 190
 191 /**********
 192  * Action *
 193  **********/
 194 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
 195                                int requested_core)
 196     : CpuAction(model, cost, failed,
 197                 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
 198     , requested_core_(requested_core)
 199 {
 200   if (model->is_update_lazy())
 201     set_last_update();
 202   model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
 203 }
 204
 205 int CpuCas01Action::requested_core() const
 206 {
 207   return requested_core_;
 208 }
 209
 210 CpuCas01Action::~CpuCas01Action() = default;
 211
 212 } // namespace resource
 213 } // namespace kernel
 214 } // namespace simgrid