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/resource/profile/Event.hpp"
9 #include "src/surf/cpu_ti.hpp"
10 #include "src/surf/surf_interface.hpp"
11 #include "surf/surf.hpp"
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_cas, res_cpu, "CPU resource, CAS01 model (used by default)");
19 static simgrid::config::Flag<std::string>
20 cpu_optim_opt("cpu/optim", "Optimization algorithm to use for CPU resources. ", "Lazy",
22 std::map<std::string, std::string, std::less<>>({
23 {"Lazy", "Lazy action management (partial invalidation in lmm + heap in action remaining)."},
24 {"TI", "Trace integration. Highly optimized mode when using availability traces (only available "
25 "for the Cas01 CPU model for now)."},
26 {"Full", "Full update of remaining and variables. Slow but may be useful when debugging."},
29 [](std::string const&) {
30 xbt_assert(_sg_cfg_init_status < 2,
31 "Cannot change the optimization algorithm after the initialization");
37 void surf_cpu_model_init_Cas01()
39 xbt_assert(surf_cpu_model_pm == nullptr, "CPU model already initialized. This should not happen.");
40 xbt_assert(surf_cpu_model_vm == nullptr, "CPU model already initialized. This should not happen.");
42 if (cpu_optim_opt == "TI") {
43 simgrid::kernel::resource::CpuTiModel::create_pm_vm_models();
47 simgrid::kernel::resource::Model::UpdateAlgo algo;
48 if (cpu_optim_opt == "Lazy")
49 algo = simgrid::kernel::resource::Model::UpdateAlgo::LAZY;
51 algo = simgrid::kernel::resource::Model::UpdateAlgo::FULL;
53 surf_cpu_model_pm = new simgrid::kernel::resource::CpuCas01Model(algo);
54 surf_cpu_model_vm = new simgrid::kernel::resource::CpuCas01Model(algo);
61 CpuCas01Model::CpuCas01Model(Model::UpdateAlgo algo) : CpuModel(algo)
63 all_existing_models.push_back(this);
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 CpuCas01Model::~CpuCas01Model()
78 surf_cpu_model_pm = nullptr;
81 Cpu* CpuCas01Model::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate, int core)
83 return new CpuCas01(this, host, speed_per_pstate, core);
89 CpuCas01::CpuCas01(CpuCas01Model* model, s4u::Host* host, const std::vector<double>& speed_per_pstate, int core)
90 : Cpu(host, speed_per_pstate)
92 this->set_core_count(core)->set_model(model)->set_constraint(
93 model->get_maxmin_system()->constraint_new(this, core * speed_per_pstate.front()));
96 CpuCas01::~CpuCas01() = default;
98 bool CpuCas01::is_used() const
100 return get_model()->get_maxmin_system()->constraint_used(get_constraint());
103 /** @brief take into account changes of speed (either load or max) */
104 void CpuCas01::on_speed_change()
106 const lmm::Variable* var;
107 const lmm::Element* elem = nullptr;
109 get_model()->get_maxmin_system()->update_constraint_bound(get_constraint(),
110 get_core_count() * speed_.scale * speed_.peak);
111 while ((var = get_constraint()->get_variable(&elem))) {
112 const CpuCas01Action* action = static_cast<CpuCas01Action*>(var->get_id());
114 get_model()->get_maxmin_system()->update_variable_bound(action->get_variable(),
115 action->requested_core() * speed_.scale * speed_.peak);
118 Cpu::on_speed_change();
121 void CpuCas01::apply_event(profile::Event* event, double value)
123 if (event == speed_.event) {
124 /* TODO (Hypervisor): do the same thing for constraint_core[i] */
125 xbt_assert(get_core_count() == 1, "FIXME: add speed scaling code also for constraint_core[i]");
127 speed_.scale = value;
130 tmgr_trace_event_unref(&speed_.event);
131 } else if (event == state_event_) {
132 /* TODO (Hypervisor): do the same thing for constraint_core[i] */
133 xbt_assert(get_core_count() == 1, "FIXME: add state change code also for constraint_core[i]");
137 XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
138 get_iface()->turn_on();
141 const lmm::Constraint* cnst = get_constraint();
142 const lmm::Variable* var;
143 const lmm::Element* elem = nullptr;
144 double date = surf_get_clock();
146 get_iface()->turn_off();
148 while ((var = cnst->get_variable(&elem))) {
149 Action* action = var->get_id();
151 if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED ||
152 action->get_state() == Action::State::IGNORED) {
153 action->set_finish_time(date);
154 action->set_state(Action::State::FAILED);
158 tmgr_trace_event_unref(&state_event_);
161 xbt_die("Unknown event!\n");
165 /** @brief Start a new execution on this CPU lasting @param size flops and using one core */
166 CpuAction* CpuCas01::execution_start(double size)
168 return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint());
171 CpuAction* CpuCas01::execution_start(double size, int requested_cores)
173 return new CpuCas01Action(get_model(), size, not is_on(), speed_.scale * speed_.peak, get_constraint(),
177 CpuAction* CpuCas01::sleep(double duration)
180 duration = std::max(duration, sg_surf_precision);
182 XBT_IN("(%s,%g)", get_cname(), duration);
183 auto* action = new CpuCas01Action(get_model(), 1.0, not is_on(), speed_.scale * speed_.peak, get_constraint());
185 // FIXME: sleep variables should not consume 1.0 in System::expand()
186 action->set_max_duration(duration);
187 action->set_suspend_state(Action::SuspendStates::SLEEPING);
188 if (duration == NO_MAX_DURATION)
189 action->set_state(Action::State::IGNORED);
191 get_model()->get_maxmin_system()->update_variable_penalty(action->get_variable(), 0.0);
192 if (get_model()->is_update_lazy()) { // remove action from the heap
193 get_model()->get_action_heap().remove(action);
194 // this is necessary for a variable with weight 0 since such variables are ignored in lmm and we need to set its
195 // max_duration correctly at the next call to share_resources
196 get_model()->get_modified_set()->push_front(*action);
206 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint,
208 : CpuAction(model, cost, failed,
209 model->get_maxmin_system()->variable_new(this, 1.0 / requested_core, requested_core * speed, 1))
210 , requested_core_(requested_core)
212 if (model->is_update_lazy())
214 model->get_maxmin_system()->expand(constraint, get_variable(), 1.0);
217 CpuCas01Action::CpuCas01Action(Model* model, double cost, bool failed, double speed, lmm::Constraint* constraint)
218 : CpuCas01Action(model, cost, failed, speed, constraint, /* requested_core */ 1)
222 int CpuCas01Action::requested_core() const
224 return requested_core_;
227 CpuCas01Action::~CpuCas01Action()=default;
229 } // namespace resource
230 } // namespace kernel
231 } // namespace simgrid