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 "simgrid/math_utils.h"
8 #include "src/kernel/resource/models/cpu_ti.hpp"
9 #include "src/kernel/resource/profile/Profile.hpp"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_cpu, ker_resource, "CPU resource, fueling execution activites");
13 namespace simgrid::kernel::resource {
19 void CpuModel::update_actions_state_lazy(double now, double /*delta*/)
21 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_precision_timing)) {
22 auto* action = static_cast<CpuAction*>(get_action_heap().pop());
23 XBT_DEBUG("Something happened to action %p", action);
25 action->finish(kernel::resource::Action::State::FINISHED);
26 XBT_DEBUG("Action %p finished", action);
30 void CpuModel::update_actions_state_full(double /*now*/, double delta)
32 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
33 auto& action = static_cast<CpuAction&>(*it);
34 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
36 action.update_remains(action.get_rate() * delta);
37 action.update_max_duration(delta);
39 if (((action.get_remains_no_update() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
40 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
41 action.finish(Action::State::FINISHED);
49 CpuImpl::CpuImpl(s4u::Host* host, const std::vector<double>& speed_per_pstate)
50 : Resource_T(host->get_cname()), piface_(host), speed_per_pstate_(speed_per_pstate)
53 speed_.peak = speed_per_pstate_.front();
57 void CpuImpl::reset_vcpu(CpuImpl* that)
59 this->pstate_ = that->pstate_;
60 this->speed_ = that->speed_;
61 this->speed_per_pstate_.clear();
62 this->speed_per_pstate_.assign(that->speed_per_pstate_.begin(), that->speed_per_pstate_.end());
65 CpuImpl* CpuImpl::set_pstate(unsigned long pstate_index)
68 pstate_index < speed_per_pstate_.size(),
69 "Invalid parameters for CPU %s (pstate %lu >= length of pstates %d). Please fix your platform file, or your "
70 "call to change the pstate.",
71 get_cname(), pstate_index, static_cast<int>(speed_per_pstate_.size()));
73 double new_peak_speed = speed_per_pstate_[pstate_index];
74 pstate_ = pstate_index;
75 speed_.peak = new_peak_speed;
81 CpuImpl* CpuImpl::set_pstate_speed(const std::vector<double>& speed_per_state)
83 xbt_assert(not speed_per_state.empty(), "CPU %s: processor speed vector cannot be empty", get_cname());
84 xbt_assert(not is_sealed(), "CPU %s: processor speed cannot be changed once CPU has been sealed", get_cname());
85 speed_per_pstate_ = speed_per_state;
86 speed_.peak = speed_per_pstate_.front();
90 double CpuImpl::get_pstate_peak_speed(unsigned long pstate_index) const
92 xbt_assert((pstate_index <= speed_per_pstate_.size()), "Invalid parameters (pstate index out of bounds)");
94 return speed_per_pstate_[pstate_index];
97 void CpuImpl::on_speed_change()
99 s4u::Host::on_speed_change(*piface_);
102 CpuImpl* CpuImpl::set_core_count(int core_count)
104 xbt_assert(not is_sealed(), "Core count cannot be changed once CPU has been sealed");
105 xbt_assert(core_count > 0, "Host %s must have at least one core, not 0.", piface_->get_cname());
106 if (dynamic_cast<CpuTiModel*>(get_model()) != nullptr)
107 xbt_assert(core_count == 1, "Multi-core not handled by this model yet");
109 core_count_ = core_count;
113 void CpuImpl::apply_sharing_policy_cfg() const
115 if (not get_constraint())
118 kernel::lmm::Constraint::SharingPolicy lmm_policy = kernel::lmm::Constraint::SharingPolicy::SHARED;
119 if (sharing_policy_ == s4u::Host::SharingPolicy::NONLINEAR)
120 lmm_policy = kernel::lmm::Constraint::SharingPolicy::NONLINEAR;
122 get_constraint()->set_sharing_policy(lmm_policy, sharing_policy_cb_);
125 void CpuImpl::set_sharing_policy(s4u::Host::SharingPolicy policy, const s4u::NonLinearResourceCb& cb)
127 xbt_assert(dynamic_cast<CpuTiModel*>(get_model()) == nullptr, "Cannot change sharing policy with CPU:TI model");
128 sharing_policy_ = policy;
129 sharing_policy_cb_ = cb;
130 apply_sharing_policy_cfg();
133 CpuImpl* CpuImpl::set_speed_profile(kernel::profile::Profile* profile)
136 xbt_assert(speed_.event == nullptr, "Cannot set a second speed trace to Host %s", piface_->get_cname());
137 speed_.event = profile->schedule(&profile::future_evt_set, this);
147 lmm::System* lmm = get_model()->get_maxmin_system();
148 if (dynamic_cast<CpuTiModel*>(get_model()) == nullptr)
149 this->set_constraint(lmm->constraint_new(this, core_count_ * speed_per_pstate_.front()));
150 apply_sharing_policy_cfg();
158 void CpuAction::update_remains_lazy(double now)
160 xbt_assert(get_state_set() == get_model()->get_started_action_set(),
161 "You're updating an action that is not running.");
162 xbt_assert(get_sharing_penalty() > 0, "You're updating an action that seems suspended.");
164 double delta = now - get_last_update();
166 if (get_remains_no_update() > 0) {
167 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
169 update_remains(get_last_value() * delta);
171 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
175 set_last_value(get_rate());
178 xbt::signal<void(CpuAction const&, Action::State)> CpuAction::on_state_change;
180 void CpuAction::suspend()
182 Action::State previous = get_state();
183 on_state_change(*this, previous);
187 void CpuAction::resume()
189 Action::State previous = get_state();
190 on_state_change(*this, previous);
194 void CpuAction::set_state(Action::State state)
196 Action::State previous = get_state();
197 Action::set_state(state);
198 on_state_change(*this, previous);
201 /** @brief returns a list of all CPUs that this action is using */
202 std::list<CpuImpl*> CpuAction::cpus() const
204 std::list<CpuImpl*> retlist;
205 int llen = get_variable()->get_number_of_constraint();
207 for (int i = 0; i < llen; i++) {
208 /* Beware of composite actions: ptasks put links and cpus together */
209 // extra pb: we cannot dynamic_cast from void*...
210 Resource* resource = get_variable()->get_constraint(i)->get_id();
211 auto* cpu = dynamic_cast<CpuImpl*>(resource);
213 retlist.push_back(cpu);
218 } // namespace simgrid::kernel::resource