1 /* Copyright (c) 2009-2023. The SimGrid Team. All rights reserved. */
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. */
6 #include <simgrid/kernel/routing/NetZoneImpl.hpp>
7 #include <simgrid/s4u/Engine.hpp>
9 #include "src/kernel/EngineImpl.hpp"
10 #include "src/kernel/resource/models/cpu_cas01.hpp"
11 #include "src/kernel/resource/models/cpu_ti.hpp"
12 #include "src/kernel/resource/profile/Event.hpp"
13 #include "src/simgrid/module.hpp"
14 #include "src/simgrid/sg_config.hpp"
16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
22 static simgrid::config::Flag<std::string>
23 cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
25 std::map<std::string, std::string, std::less<>>({
26 {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
27 {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
28 "for the Cas01 CPU model for now)."},
29 {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
32 [](std::string const&) {
33 xbt_assert(_sg_cfg_init_status < 2,
34 "Cannot change the optimization algorithm after the initialization");
37 static simgrid::config::Flag<std::string> cfg_cpu_solver("cpu/solver", "Set linear equations solver used by CPU model",
38 "maxmin", &simgrid::kernel::lmm::System::validate_solver);
43 SIMGRID_REGISTER_CPU_MODEL(Cas01, "Simplistic CPU model (time=size/speed)", []() {
44 if (cpu_optim_opt == "TI") {
45 simgrid::kernel::resource::CpuTiModel::create_pm_models();
49 auto cpu_model_pm = std::make_shared<simgrid::kernel::resource::CpuCas01Model>("Cpu_Cas01");
50 auto* engine = simgrid::kernel::EngineImpl::get_instance();
51 engine->add_model(cpu_model_pm);
52 engine->get_netzone_root()->set_cpu_pm_model(cpu_model_pm);
55 namespace simgrid::kernel::resource {
57 CpuCas01Model::CpuCas01Model(const std::string& name) : CpuModel(name)
59 if (config::get_value<std::string>("cpu/optim") == "Lazy")
60 set_update_algorithm(Model::UpdateAlgo::LAZY);
62 bool select = config::get_value<bool>("cpu/maxmin-selective-update");
64 if (is_update_lazy()) {
65 xbt_assert(select || config::is_default("cpu/maxmin-selective-update"),
66 "You cannot disable cpu selective update when using the lazy update mechanism");
70 set_maxmin_system(lmm::System::build(cfg_cpu_solver.get(), select));
73 CpuImpl* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
75 return (new CpuCas01(host, speed_per_pstate))->set_model(this);
81 /** @brief take into account changes of speed (either load or max) */
82 void CpuCas01::on_speed_change()
84 const lmm::Element* elem = nullptr;
86 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
87 get_core_count() * speed_.scale * speed_.peak);
89 while (const auto* var = get_constraint()->get_variable(&elem)) {
90 const auto* action = static_cast<CpuCas01Action*>(var->get_id());
91 double bound = action->requested_core() * speed_.scale * speed_.peak;
92 if (action->get_user_bound() > 0) {
93 bound = std::min(bound, action->get_user_bound());
96 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), bound);
99 CpuImpl::on_speed_change();
102 void CpuCas01::apply_event(profile::Event* event, double value)
104 if (event == speed_.event) {
105 speed_.scale = value;
108 tmgr_trace_event_unref(&speed_.event);
109 } else if (event == get_state_event()) {
112 XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
113 get_iface()->turn_on();
116 get_iface()->turn_off();
122 xbt_die("Unknown event!\n");
126 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
127 CpuAction* CpuCas01::execution_start(double size, double user_bound)
129 return execution_start(size, 1, user_bound);
132 CpuAction* CpuCas01::execution_start(double size, int requested_cores, double user_bound)
135 new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
136 action->set_user_bound(user_bound);
137 if (user_bound > 0 && user_bound < action->get_bound()) {
138 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), user_bound);
141 action->set_rate_factor(factor_cb_(size));
147 CpuAction* CpuCas01::sleep(double duration)
150 duration = std::max(duration, sg_precision_timing);
152 XBT_IN("(%s, %g)", get_cname(), duration);
153 auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint(), 1);
155 // FIXME: sleep variables should not consume 1.0 in System::expand()
156 action->set_max_duration(duration);
157 action->set_suspend_state(Action::SuspendStates::SLEEPING);
158 if (duration == NO_MAX_DURATION)
159 action->set_state(Action::State::IGNORED);
161 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
162 if (get_model()->is_update_lazy()) { // remove action from the heap
163 get_model()->get_action_heap().remove(action);
164 // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
165 // max_duration correctly at the next call to share_resources
166 get_model()->get_modified_set()->push_front(*action);
173 void CpuCas01::set_factor_cb(const std::function<s4u::Host::CpuFactorCb>& cb)
175 xbt_assert(not is_sealed(), "Cannot set CPU factor callback in an already sealed CPU(%s)", get_cname());
182 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
184 : CpuAction(model, cost, failed,
185 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
186 , requested_core_(requested_core)
188 if (model->is_update_lazy())
190 model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
193 } // namespace simgrid::kernel::resource