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/resource/models/cpu_ti.hpp"
8 #include "src/kernel/resource/profile/Profile.hpp"
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_cpu, ker_resource, "CPU resource, fueling execution activites");
12 namespace simgrid::kernel::resource {
18 void CpuModel::update_actions_state_lazy(double now, double /*delta*/)
20 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_precision_timing)) {
21 auto* action = static_cast<CpuAction*>(get_action_heap().pop());
22 XBT_DEBUG("Something happened to action %p", action);
24 action->finish(kernel::resource::Action::State::FINISHED);
25 XBT_DEBUG("Action %p finished", action);
29 void CpuModel::update_actions_state_full(double /*now*/, double delta)
31 for (auto it = std::begin(*get_started_action_set()); it != std::end(*get_started_action_set());) {
32 auto& action = static_cast<CpuAction&>(*it);
33 ++it; // increment iterator here since the following calls to action.finish() may invalidate it
35 action.update_remains(action.get_rate() * delta);
36 action.update_max_duration(delta);
38 if (((action.get_remains_no_update() <= 0) && (action.get_variable()->get_penalty() > 0)) ||
39 ((action.get_max_duration() != NO_MAX_DURATION) && (action.get_max_duration() <= 0))) {
40 action.finish(Action::State::FINISHED);
48 CpuImpl::CpuImpl(s4u::Host* host, const std::vector<double>& speed_per_pstate)
49 : Resource_T(host->get_cname()), piface_(host), speed_per_pstate_(speed_per_pstate)
52 speed_.peak = speed_per_pstate_.front();
56 void CpuImpl::reset_vcpu(CpuImpl* that)
58 this->pstate_ = that->pstate_;
59 this->speed_ = that->speed_;
60 this->speed_per_pstate_.clear();
61 this->speed_per_pstate_.assign(that->speed_per_pstate_.begin(), that->speed_per_pstate_.end());
64 CpuImpl* CpuImpl::set_pstate(unsigned long pstate_index)
67 pstate_index < speed_per_pstate_.size(),
68 "Invalid parameters for CPU %s (pstate %lu >= length of pstates %d). Please fix your platform file, or your "
69 "call to change the pstate.",
70 get_cname(), pstate_index, static_cast<int>(speed_per_pstate_.size()));
72 double new_peak_speed = speed_per_pstate_[pstate_index];
73 pstate_ = pstate_index;
74 speed_.peak = new_peak_speed;
80 CpuImpl* CpuImpl::set_pstate_speed(const std::vector<double>& speed_per_state)
82 xbt_assert(not speed_per_state.empty(), "CPU %s: processor speed vector cannot be empty", get_cname());
83 xbt_assert(not is_sealed(), "CPU %s: processor speed cannot be changed once CPU has been sealed", get_cname());
84 speed_per_pstate_ = speed_per_state;
85 speed_.peak = speed_per_pstate_.front();
89 double CpuImpl::get_pstate_peak_speed(unsigned long pstate_index) const
91 xbt_assert((pstate_index <= speed_per_pstate_.size()), "Invalid parameters (pstate index out of bounds)");
93 return speed_per_pstate_[pstate_index];
96 void CpuImpl::on_speed_change()
98 s4u::Host::on_speed_change(*piface_);
101 CpuImpl* CpuImpl::set_core_count(int core_count)
103 xbt_assert(not is_sealed(), "Core count cannot be changed once CPU has been sealed");
104 xbt_assert(core_count > 0, "Host %s must have at least one core, not 0.", piface_->get_cname());
105 if (dynamic_cast<CpuTiModel*>(get_model()) != nullptr)
106 xbt_assert(core_count == 1, "Multi-core not handled by this model yet");
108 core_count_ = core_count;
112 void CpuImpl::apply_sharing_policy_cfg() const
114 if (not get_constraint())
117 kernel::lmm::Constraint::SharingPolicy lmm_policy = kernel::lmm::Constraint::SharingPolicy::SHARED;
118 if (sharing_policy_ == s4u::Host::SharingPolicy::NONLINEAR)
119 lmm_policy = kernel::lmm::Constraint::SharingPolicy::NONLINEAR;
121 get_constraint()->set_sharing_policy(lmm_policy, sharing_policy_cb_);
124 void CpuImpl::set_sharing_policy(s4u::Host::SharingPolicy policy, const s4u::NonLinearResourceCb& cb)
126 xbt_assert(dynamic_cast<CpuTiModel*>(get_model()) == nullptr, "Cannot change sharing policy with CPU:TI model");
127 sharing_policy_ = policy;
128 sharing_policy_cb_ = cb;
129 apply_sharing_policy_cfg();
132 CpuImpl* CpuImpl::set_speed_profile(kernel::profile::Profile* profile)
135 xbt_assert(speed_.event == nullptr, "Cannot set a second speed trace to Host %s", piface_->get_cname());
136 speed_.event = profile->schedule(&profile::future_evt_set, this);
146 lmm::System* lmm = get_model()->get_maxmin_system();
147 if (dynamic_cast<CpuTiModel*>(get_model()) == nullptr)
148 this->set_constraint(lmm->constraint_new(this, core_count_ * speed_per_pstate_.front()));
149 apply_sharing_policy_cfg();
157 void CpuAction::update_remains_lazy(double now)
159 xbt_assert(get_state_set() == get_model()->get_started_action_set(),
160 "You're updating an action that is not running.");
161 xbt_assert(get_sharing_penalty() > 0, "You're updating an action that seems suspended.");
163 double delta = now - get_last_update();
165 if (get_remains_no_update() > 0) {
166 XBT_DEBUG("Updating action(%p): remains was %f, last_update was: %f", this, get_remains_no_update(),
168 update_remains(get_last_value() * delta);
170 XBT_DEBUG("Updating action(%p): remains is now %f", this, get_remains_no_update());
174 set_last_value(get_rate());
177 xbt::signal<void(CpuAction const&, Action::State)> CpuAction::on_state_change;
179 void CpuAction::suspend()
181 Action::State previous = get_state();
182 on_state_change(*this, previous);
186 void CpuAction::resume()
188 Action::State previous = get_state();
189 on_state_change(*this, previous);
193 void CpuAction::set_state(Action::State state)
195 Action::State previous = get_state();
196 Action::set_state(state);
197 on_state_change(*this, previous);
200 /** @brief returns a list of all CPUs that this action is using */
201 std::list<CpuImpl*> CpuAction::cpus() const
203 std::list<CpuImpl*> retlist;
204 int llen = get_variable()->get_number_of_constraint();
206 for (int i = 0; i < llen; i++) {
207 /* Beware of composite actions: ptasks put links and cpus together */
208 // extra pb: we cannot dynamic_cast from void*...
209 Resource* resource = get_variable()->get_constraint(i)->get_id();
210 auto* cpu = dynamic_cast<CpuImpl*>(resource);
212 retlist.push_back(cpu);
217 } // namespace simgrid::kernel::resource