1 /* Copyright (c) 2009-2021. 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 "simgrid/sg_config.hpp"
10 #include "src/kernel/EngineImpl.hpp"
11 #include "src/kernel/resource/profile/Event.hpp"
12 #include "src/surf/cpu_cas01.hpp"
13 #include "src/surf/cpu_ti.hpp"
14 #include "src/surf/surf_interface.hpp"
15 #include "surf/surf.hpp"
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
23 static simgrid::config::Flag<std::string>
24 cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
26 std::map<std::string, std::string, std::less<>>({
27 {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
28 {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
29 "for the Cas01 CPU model for now)."},
30 {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
33 [](std::string const&) {
34 xbt_assert(_sg_cfg_init_status < 2,
35 "Cannot change the optimization algorithm after the initialization");
41 void surf_cpu_model_init_Cas01()
43 if (cpu_optim_opt == "TI") {
44 simgrid::kernel::resource::CpuTiModel::create_pm_models();
48 auto cpu_model_pm = std::make_shared<simgrid::kernel::resource::CpuCas01Model>("Cpu_Cas01");
49 simgrid::kernel::EngineImpl::get_instance()->add_model(cpu_model_pm);
50 simgrid::s4u::Engine::get_instance()->get_netzone_root()->get_impl()->set_cpu_pm_model(cpu_model_pm);
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(new lmm::System(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 bool CpuCas01::is_used() const
83 return get_model()->get_maxmin_system()->constraint_used(get_constraint());
86 /** @brief take into account changes of speed (either load or max) */
87 void CpuCas01::on_speed_change()
89 const lmm::Element* elem = nullptr;
91 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
92 get_core_count() * speed_.scale * speed_.peak);
94 while (const auto* var = get_constraint()->get_variable(&elem)) {
95 const auto* action = static_cast<CpuCas01Action*>(var->get_id());
96 double bound = action->requested_core() * speed_.scale * speed_.peak;
97 if (action->get_user_bound() > 0) {
98 bound = std::min(bound, action->get_user_bound());
101 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), bound);
104 CpuImpl::on_speed_change();
107 void CpuCas01::apply_event(profile::Event* event, double value)
109 if (event == speed_.event) {
110 /* TODO (Hypervisor): do the same thing for constraint_core[i] */
111 xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
113 speed_.scale = value;
116 tmgr_trace_event_unref(&speed_.event);
117 } else if (event == state_event_) {
118 /* TODO (Hypervisor): do the same thing for constraint_core[i] */
119 xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
123 XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
124 get_iface()->turn_on();
127 const lmm::Element* elem = nullptr;
128 double date = surf_get_clock();
130 get_iface()->turn_off();
132 while (const auto* var = get_constraint()->get_variable(&elem)) {
133 Action* action = var->get_id();
135 if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
136 action->get_state() == Action::State::IGNORED) {
137 action->set_finish_time(date);
138 action->set_state(Action::State::FAILED);
142 tmgr_trace_event_unref(&state_event_);
145 xbt_die("Unknown event!\n");
149 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
150 CpuAction* CpuCas01::execution_start(double size, double user_bound)
152 return execution_start(size, 1, user_bound);
155 CpuAction* CpuCas01::execution_start(double size, int requested_cores, double user_bound)
158 new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(), requested_cores);
159 action->set_user_bound(user_bound);
160 if (user_bound > 0 && user_bound < action->get_bound()) {
161 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(), user_bound);
167 CpuAction* CpuCas01::sleep(double duration)
170 duration = std::max(duration, sg_surf_precision);
172 XBT_IN("(%s,%g)", get_cname(), duration);
173 auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint(), 1);
175 // FIXME: sleep variables should not consume 1.0 in System::expand()
176 action->set_max_duration(duration);
177 action->set_suspend_state(Action::SuspendStates::SLEEPING);
178 if (duration == NO_MAX_DURATION)
179 action->set_state(Action::State::IGNORED);
181 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
182 if (get_model()->is_update_lazy()) { // remove action from the heap
183 get_model()->get_action_heap().remove(action);
184 // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
185 // max_duration correctly at the next call to share_resources
186 get_model()->get_modified_set()->push_front(*action);
196 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
198 : CpuAction(model, cost, failed,
199 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
200 , requested_core_(requested_core)
202 if (model->is_update_lazy())
204 model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
207 int CpuCas01Action::requested_core() const
209 return requested_core_;
212 } // namespace resource
213 } // namespace kernel
214 } // namespace simgrid