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 "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"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
20 static simgrid::config::Flag<std::string>
21 cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
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."},
30 [](std::string const&) {
31 xbt_assert(_sg_cfg_init_status < 2,
32 "Cannot change the optimization algorithm after the initialization");
38 void surf_cpu_model_init_Cas01()
40 if (cpu_optim_opt == "TI") {
41 simgrid::kernel::resource::CpuTiModel::create_pm_vm_models();
45 simgrid::kernel::resource::Model::UpdateAlgo algo;
46 if (cpu_optim_opt == "Lazy")
47 algo = simgrid::kernel::resource::Model::UpdateAlgo::LAZY;
49 algo = simgrid::kernel::resource::Model::UpdateAlgo::FULL;
51 auto cpu_model_pm = std::make_shared<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_shared<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);
63 CpuCas01Model::CpuCas01Model(Model::UpdateAlgo algo) : CpuModel(algo)
65 bool select = config::get_value<bool>("cpu/maxmin-selective-update");
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");
73 set_maxmin_system(new lmm::System(select));
76 Cpu* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
78 return (new CpuCas01(host, speed_per_pstate))->set_model(this);
84 bool CpuCas01::is_used() const
86 return get_model()->get_maxmin_system()->constraint_used(get_constraint());
89 /** @brief take into account changes of speed (either load or max) */
90 void CpuCas01::on_speed_change()
92 const lmm::Variable* var;
93 const lmm::Element* elem = nullptr;
95 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
96 get_core_count() * speed_.scale * speed_.peak);
97 while ((var = get_constraint()->get_variable(&elem))) {
98 const CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
100 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
101 action->requested_core() * speed_.scale * speed_.peak);
104 Cpu::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::Constraint* cnst = get_constraint();
128 const lmm::Variable* var;
129 const lmm::Element* elem = nullptr;
130 double date = surf_get_clock();
132 get_iface()->turn_off();
134 while ((var = cnst->get_variable(&elem))) {
135 Action* action = var->get_id();
137 if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
138 action->get_state() == Action::State::IGNORED) {
139 action->set_finish_time(date);
140 action->set_state(Action::State::FAILED);
144 tmgr_trace_event_unref(&state_event_);
147 xbt_die("Unknown event!\n");
151 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
152 CpuAction* CpuCas01::execution_start(double size)
154 return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint());
157 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
159 return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(),
163 CpuAction* CpuCas01::sleep(double duration)
166 duration = std::max(duration, sg_surf_precision);
168 XBT_IN("(%s,%g)", get_cname(), duration);
169 auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint());
171 // FIXME: sleep variables should not consume 1.0 in System::expand()
172 action->set_max_duration(duration);
173 action->set_suspend_state(Action::SuspendStates::SLEEPING);
174 if (duration == NO_MAX_DURATION)
175 action->set_state(Action::State::IGNORED);
177 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
178 if (get_model()->is_update_lazy()) { // remove action from the heap
179 get_model()->get_action_heap().remove(action);
180 // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
181 // max_duration correctly at the next call to share_resources
182 get_model()->get_modified_set()->push_front(*action);
192 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
194 : CpuAction(model, cost, failed,
195 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
196 , requested_core_(requested_core)
198 if (model->is_update_lazy())
200 model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
203 int CpuCas01Action::requested_core() const
205 return requested_core_;
208 } // namespace resource
209 } // namespace kernel
210 } // namespace simgrid