1 /* Copyright (c) 2013-2023. 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 "src/kernel/resource/CpuImpl.hpp"
7 #include "src/kernel/EngineImpl.hpp"
8 #include "src/kernel/resource/models/cpu_ti.hpp"
9 #include "src/kernel/resource/profile/Profile.hpp"
10 #include "src/simgrid/math_utils.h"
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_cpu, ker_resource, "CPU resource, fueling execution activites");
14 namespace simgrid::kernel::resource {
20 void CpuModel::update_actions_state_lazy(double now, double /*delta*/)
22 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_precision_timing)) {
23 auto* action = static_cast<CpuAction*>(get_action_heap().pop());
24 XBT_DEBUG("Something happened to action %p", action);
26 action->finish(kernel::resource::Action::State::FINISHED);
27 XBT_DEBUG("Action %p finished", action);
31 void CpuModel::update_actions_state_full(double /*now*/, double delta)
33 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
34 auto& action = static_cast<CpuAction&>(*it);
35 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
37 action.update_remains(action.get_rate() * delta);
38 action.update_max_duration(delta);
40 if (((action.get_remains_no_update() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
41 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
42 action.finish(Action::State::FINISHED);
50 CpuImpl::CpuImpl(s4u::Host* host, const std::vector<double>& speed_per_pstate)
51 : Resource_T(host->get_cname()), piface_(host), speed_per_pstate_(speed_per_pstate)
54 speed_.peak = speed_per_pstate_.front();
58 void CpuImpl::reset_vcpu(CpuImpl* that)
60 this->pstate_ = that->pstate_;
61 this->speed_ = that->speed_;
62 this->speed_per_pstate_.clear();
63 this->speed_per_pstate_.assign(that->speed_per_pstate_.begin(), that->speed_per_pstate_.end());
66 CpuImpl* CpuImpl::set_pstate(unsigned long pstate_index)
69 pstate_index < speed_per_pstate_.size(),
70 "Invalid parameters for CPU %s (pstate %lu >= length of pstates %zu). Please fix your platform file, or your "
71 "call to change the pstate.",
72 get_cname(), pstate_index, speed_per_pstate_.size());
74 double new_peak_speed = speed_per_pstate_[pstate_index];
75 pstate_ = pstate_index;
76 speed_.peak = new_peak_speed;
82 CpuImpl* CpuImpl::set_pstate_speed(const std::vector<double>& speed_per_state)
84 xbt_assert(not speed_per_state.empty(), "CPU %s: processor speed vector cannot be empty", get_cname());
85 xbt_assert(not is_sealed(), "CPU %s: processor speed cannot be changed once CPU has been sealed", get_cname());
86 speed_per_pstate_ = speed_per_state;
87 speed_.peak = speed_per_pstate_.front();
91 double CpuImpl::get_pstate_peak_speed(unsigned long pstate_index) const
93 xbt_assert(pstate_index < speed_per_pstate_.size(), "Invalid parameters (pstate index %lu out of bounds %zu)",
94 pstate_index, speed_per_pstate_.size());
95 return speed_per_pstate_[pstate_index];
98 void CpuImpl::on_speed_change()
100 s4u::Host::on_speed_change(*piface_);
101 piface_->on_this_speed_change(*piface_);
104 CpuImpl* CpuImpl::set_core_count(int core_count)
106 xbt_assert(not is_sealed(), "Core count cannot be changed once CPU has been sealed");
107 xbt_assert(core_count > 0, "Host %s must have at least one core, not 0.", piface_->get_cname());
108 if (dynamic_cast<CpuTiModel*>(get_model()) != nullptr)
109 xbt_assert(core_count == 1, "Multi-core not handled by this model yet");
111 core_count_ = core_count;
115 void CpuImpl::apply_sharing_policy_cfg() const
117 if (not get_constraint())
120 kernel::lmm::Constraint::SharingPolicy lmm_policy = kernel::lmm::Constraint::SharingPolicy::SHARED;
121 if (sharing_policy_ == s4u::Host::SharingPolicy::NONLINEAR)
122 lmm_policy = kernel::lmm::Constraint::SharingPolicy::NONLINEAR;
124 get_constraint()->set_sharing_policy(lmm_policy, sharing_policy_cb_);
127 void CpuImpl::set_sharing_policy(s4u::Host::SharingPolicy policy, const s4u::NonLinearResourceCb& cb)
129 xbt_assert(dynamic_cast<CpuTiModel*>(get_model()) == nullptr, "Cannot change sharing policy with CPU:TI model");
130 sharing_policy_ = policy;
131 sharing_policy_cb_ = cb;
132 apply_sharing_policy_cfg();
135 CpuImpl* CpuImpl::set_speed_profile(kernel::profile::Profile* profile)
138 xbt_assert(speed_.event == nullptr, "Cannot set a second speed trace to Host %s", piface_->get_cname());
139 speed_.event = profile->schedule(&profile::future_evt_set, this);
149 lmm::System* lmm = get_model()->get_maxmin_system();
150 if (dynamic_cast<CpuTiModel*>(get_model()) == nullptr)
151 this->set_constraint(lmm->constraint_new(this, core_count_ * speed_per_pstate_.front()));
152 apply_sharing_policy_cfg();
156 void CpuImpl::turn_off()
159 Resource::turn_off();
161 const kernel::lmm::Element* elem = nullptr;
162 double now = EngineImpl::get_clock();
163 while (const auto* var = get_constraint()->get_variable(&elem)) {
164 Action* action = var->get_id();
165 if (action->get_state() == Action::State::INITED || action->get_state() == Action::State::STARTED) {
166 action->set_finish_time(now);
167 action->set_state(Action::State::FAILED);
177 void CpuAction::update_remains_lazy(double now)
179 xbt_assert(get_state_set() == get_model()->get_started_action_set(),
180 "You're updating an action that is not running.");
181 xbt_assert(get_sharing_penalty() > 0, "You're updating an action that seems suspended.");
183 double delta = now - get_last_update();
185 if (get_remains_no_update() > 0) {
186 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
188 update_remains(get_last_value() * delta);
190 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
194 set_last_value(get_rate());
197 void CpuAction::set_state(Action::State state)
199 Action::State previous = get_state();
200 Action::set_state(state);
201 s4u::Host::on_exec_state_change(*this, previous);
204 /** @brief returns a list of all CPUs that this action is using */
205 std::list<CpuImpl*> CpuAction::cpus() const
207 std::list<CpuImpl*> retlist;
208 int llen = get_variable()->get_number_of_constraint();
210 for (int i = 0; i < llen; i++) {
211 /* Beware of composite actions: ptasks put links and cpus together */
212 // extra pb: we cannot dynamic_cast from void*...
213 Resource* resource = get_variable()->get_constraint(i)->get_id();
214 auto* cpu = dynamic_cast<CpuImpl*>(resource);
216 retlist.push_back(cpu);
221 } // namespace simgrid::kernel::resource