1 /* Copyright (c) 2013-2021. 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. */
7 #include "src/kernel/resource/profile/Event.hpp"
8 #include "src/kernel/resource/profile/Profile.hpp"
9 #include "src/surf/surf_interface.hpp"
10 #include "surf/surf.hpp"
15 constexpr double EPSILON = 0.000000001;
17 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(cpu_ti, res_cpu, "CPU resource, Trace Integration model");
27 CpuTiProfile::CpuTiProfile(const profile::Profile* profile)
31 unsigned nb_points = profile->event_list.size() + 1;
32 time_points_.reserve(nb_points);
33 integral_.reserve(nb_points);
34 for (auto const& val : profile->event_list) {
35 time_points_.push_back(time);
36 integral_.push_back(integral);
38 integral += val.date_ * val.value_;
40 time_points_.push_back(time);
41 integral_.push_back(integral);
45 * @brief Integrate trace
47 * Wrapper around surf_cpu_integrate_trace_simple() to get
50 * @param a Begin of interval
51 * @param b End of interval
52 * @return the integrate value. -1 if an error occurs.
54 double CpuTiTmgr::integrate(double a, double b) const
56 if ((a < 0.0) || (a > b)) {
57 xbt_die("Error, invalid integration interval [%.2f,%.2f]. "
58 "You probably have a task executing with negative computation amount. Check your code.",
61 if (fabs(a - b) < EPSILON)
64 if (type_ == Type::FIXED) {
65 return (b - a) * value_;
69 if (fabs(ceil(a / last_time_) - a / last_time_) < EPSILON)
70 a_index = 1 + ceil(a / last_time_);
72 a_index = ceil(a / last_time_);
73 double b_index = floor(b / last_time_);
75 if (a_index > b_index) { /* Same chunk */
76 return profile_->integrate_simple(a - (a_index - 1) * last_time_, b - b_index * last_time_);
79 double first_chunk = profile_->integrate_simple(a - (a_index - 1) * last_time_, last_time_);
80 double middle_chunk = (b_index - a_index) * total_;
81 double last_chunk = profile_->integrate_simple(0.0, b - b_index * last_time_);
83 XBT_DEBUG("first_chunk=%.2f middle_chunk=%.2f last_chunk=%.2f\n", first_chunk, middle_chunk, last_chunk);
85 return (first_chunk + middle_chunk + last_chunk);
89 * @brief Auxiliary function to compute the integral between a and b.
90 * It simply computes the integrals at point a and b and returns the difference between them.
91 * @param a Initial point
92 * @param b Final point
94 double CpuTiProfile::integrate_simple(double a, double b) const
96 return integrate_simple_point(b) - integrate_simple_point(a);
100 * @brief Auxiliary function to compute the integral at point a.
103 double CpuTiProfile::integrate_simple_point(double a) const
107 int ind = binary_search(time_points_, a);
108 integral += integral_[ind];
110 XBT_DEBUG("a %f ind %d integral %f ind + 1 %f ind %f time +1 %f time %f", a, ind, integral, integral_[ind + 1],
111 integral_[ind], time_points_[ind + 1], time_points_[ind]);
112 double_update(&a_aux, time_points_[ind], sg_maxmin_precision * sg_surf_precision);
115 ((integral_[ind + 1] - integral_[ind]) / (time_points_[ind + 1] - time_points_[ind])) * (a - time_points_[ind]);
116 XBT_DEBUG("Integral a %f = %f", a, integral);
122 * @brief Computes the time needed to execute "amount" on cpu.
124 * Here, amount can span multiple trace periods
126 * @param a Initial time
127 * @param amount Amount to be executed
130 double CpuTiTmgr::solve(double a, double amount) const
132 /* Fix very small negative numbers */
133 if ((a < 0.0) && (a > -EPSILON)) {
136 if ((amount < 0.0) && (amount > -EPSILON)) {
141 if ((a < 0.0) || (amount < 0.0)) {
142 XBT_CRITICAL("Error, invalid parameters [a = %.2f, amount = %.2f]. "
143 "You probably have a task executing with negative computation amount. Check your code.",
148 /* At this point, a and amount are positive */
149 if (amount < EPSILON)
152 /* Is the trace fixed ? */
153 if (type_ == Type::FIXED) {
154 return (a + (amount / value_));
157 XBT_DEBUG("amount %f total %f", amount, total_);
158 /* Reduce the problem to one where amount <= trace_total */
159 double quotient = floor(amount / total_);
160 double reduced_amount = (total_) * ((amount / total_) - floor(amount / total_));
161 double reduced_a = a - (last_time_) * static_cast<int>(floor(a / last_time_));
163 XBT_DEBUG("Quotient: %g reduced_amount: %f reduced_a: %f", quotient, reduced_amount, reduced_a);
165 /* Now solve for new_amount which is <= trace_total */
167 XBT_DEBUG("Solve integral: [%.2f, amount=%.2f]", reduced_a, reduced_amount);
168 double amount_till_end = integrate(reduced_a, last_time_);
170 if (amount_till_end > reduced_amount) {
171 reduced_b = profile_->solve_simple(reduced_a, reduced_amount);
173 reduced_b = last_time_ + profile_->solve_simple(0.0, reduced_amount - amount_till_end);
176 /* Re-map to the original b and amount */
177 return last_time_ * floor(a / last_time_) + (quotient * last_time_) + reduced_b;
181 * @brief Auxiliary function to solve integral.
182 * It returns the date when the requested amount of flops is available
183 * @param a Initial point
184 * @param amount Amount of flops
185 * @return The date when amount is available.
187 double CpuTiProfile::solve_simple(double a, double amount) const
189 double integral_a = integrate_simple_point(a);
190 int ind = binary_search(integral_, integral_a + amount);
191 double time = time_points_[ind];
192 time += (integral_a + amount - integral_[ind]) /
193 ((integral_[ind + 1] - integral_[ind]) / (time_points_[ind + 1] - time_points_[ind]));
199 * @brief Auxiliary function to update the CPU speed scale.
201 * This function uses the trace structure to return the speed scale at the determined time a.
203 * @return CPU speed scale
205 double CpuTiTmgr::get_power_scale(double a) const
207 double reduced_a = a - floor(a / last_time_) * last_time_;
208 int point = CpuTiProfile::binary_search(profile_->time_points_, reduced_a);
209 kernel::profile::DatedValue val = speed_profile_->event_list.at(point);
214 * @brief Creates a new integration trace from a tmgr_trace_t
216 * @param speed_trace CPU availability trace
217 * @param value Percentage of CPU speed available (useful to fixed tracing)
218 * @return Integration trace structure
220 CpuTiTmgr::CpuTiTmgr(kernel::profile::Profile* speed_profile, double value) : speed_profile_(speed_profile)
222 double total_time = 0.0;
223 profile_.reset(nullptr);
225 /* no availability file, fixed trace */
226 if (not speed_profile) {
228 XBT_DEBUG("No availability trace. Constant value = %f", value);
232 /* only one point available, fixed trace */
233 if (speed_profile->event_list.size() == 1) {
234 value_ = speed_profile->event_list.front().value_;
238 type_ = Type::DYNAMIC;
240 /* count the total time of trace file */
241 for (auto const& val : speed_profile->event_list)
242 total_time += val.date_;
244 profile_ = std::make_unique<CpuTiProfile>(speed_profile);
245 last_time_ = total_time;
246 total_ = profile_->integrate_simple(0, total_time);
248 XBT_DEBUG("Total integral %f, last_time %f ", total_, last_time_);
252 * @brief Binary search in array.
253 * It returns the last point of the interval in which "a" is.
255 * @param a Value to search
256 * @return Index of point
258 int CpuTiProfile::binary_search(const std::vector<double>& array, double a)
262 auto pos = std::upper_bound(begin(array), end(array), a);
263 return std::distance(begin(array), pos) - 1;
270 void CpuTiModel::create_pm_vm_models()
272 xbt_assert(surf_cpu_model_pm == nullptr, "CPU model already initialized. This should not happen.");
273 xbt_assert(surf_cpu_model_vm == nullptr, "CPU model already initialized. This should not happen.");
275 surf_cpu_model_pm = new CpuTiModel();
276 surf_cpu_model_vm = new CpuTiModel();
279 CpuTiModel::CpuTiModel() : CpuModel(Model::UpdateAlgo::FULL)
281 all_existing_models.push_back(this);
284 CpuTiModel::~CpuTiModel()
286 surf_cpu_model_pm = nullptr;
289 Cpu* CpuTiModel::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate)
291 return (new CpuTi(host, speed_per_pstate))->set_model(this);
294 double CpuTiModel::next_occurring_event(double now)
296 double min_action_duration = -1;
298 /* iterates over modified cpus to update share resources */
299 for (auto it = std::begin(modified_cpus_); it != std::end(modified_cpus_);) {
301 ++it; // increment iterator here since the following call to ti.update_actions_finish_time() may invalidate it
302 cpu.update_actions_finish_time(now);
305 /* get the min next event if heap not empty */
306 if (not get_action_heap().empty())
307 min_action_duration = get_action_heap().top_date() - now;
309 XBT_DEBUG("Share resources, min next event date: %f", min_action_duration);
311 return min_action_duration;
314 void CpuTiModel::update_actions_state(double now, double /*delta*/)
316 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
317 auto* action = static_cast<CpuTiAction*>(get_action_heap().pop());
318 XBT_DEBUG("Action %p: finish", action);
319 action->finish(Action::State::FINISHED);
320 /* update remaining amount of all actions */
321 action->cpu_->update_remaining_amount(surf_get_clock());
328 CpuTi::CpuTi(s4u::Host* host, const std::vector<double>& speed_per_pstate) : Cpu(host, speed_per_pstate)
330 speed_.peak = speed_per_pstate.front();
331 XBT_DEBUG("CPU create: peak=%f", speed_.peak);
333 speed_integrated_trace_ = new CpuTiTmgr(nullptr, 1 /*scale*/);
339 delete speed_integrated_trace_;
342 void CpuTi::set_speed_profile(kernel::profile::Profile* profile)
344 delete speed_integrated_trace_;
345 speed_integrated_trace_ = new CpuTiTmgr(profile, speed_.scale);
347 /* add a fake trace event if periodicity == 0 */
348 if (profile && profile->event_list.size() > 1) {
349 kernel::profile::DatedValue val = profile->event_list.back();
350 if (val.date_ < 1e-12) {
351 auto* prof = new kernel::profile::Profile();
352 speed_.event = prof->schedule(&profile::future_evt_set, this);
357 void CpuTi::apply_event(kernel::profile::Event* event, double value)
359 if (event == speed_.event) {
360 XBT_DEBUG("Speed changed in trace! New fixed value: %f", value);
362 /* update remaining of actions and put in modified cpu list */
363 update_remaining_amount(surf_get_clock());
367 delete speed_integrated_trace_;
368 speed_integrated_trace_ = new CpuTiTmgr(value);
370 speed_.scale = value;
371 tmgr_trace_event_unref(&speed_.event);
373 } else if (event == state_event_) {
376 XBT_VERB("Restart actors on host %s", get_iface()->get_cname());
377 get_iface()->turn_on();
380 get_iface()->turn_off();
381 double date = surf_get_clock();
383 /* put all action running on cpu to failed */
384 for (CpuTiAction& action : action_set_) {
385 if (action.get_state() == Action::State::INITED || action.get_state() == Action::State::STARTED ||
386 action.get_state() == Action::State::IGNORED) {
387 action.set_finish_time(date);
388 action.set_state(Action::State::FAILED);
389 get_model()->get_action_heap().remove(&action);
393 tmgr_trace_event_unref(&state_event_);
396 xbt_die("Unknown event!\n");
400 /** Update the actions that are running on this CPU (which was modified recently) */
401 void CpuTi::update_actions_finish_time(double now)
403 /* update remaining amount of actions */
404 update_remaining_amount(now);
406 /* Compute the sum of priorities for the actions running on that CPU */
408 for (CpuTiAction const& action : action_set_) {
409 /* action not running, skip it */
410 if (action.get_state_set() != surf_cpu_model_pm->get_started_action_set())
413 /* bogus priority, skip it */
414 if (action.get_sharing_penalty() <= 0)
417 /* action suspended, skip it */
418 if (not action.is_running())
421 sum_priority_ += 1.0 / action.get_sharing_penalty();
424 for (CpuTiAction& action : action_set_) {
425 double min_finish = -1;
426 /* action not running, skip it */
427 if (action.get_state_set() != surf_cpu_model_pm->get_started_action_set())
430 /* verify if the action is really running on cpu */
431 if (action.is_running() && action.get_sharing_penalty() > 0) {
432 /* total area needed to finish the action. Used in trace integration */
433 double total_area = (action.get_remains() * sum_priority_ * action.get_sharing_penalty()) / speed_.peak;
435 action.set_finish_time(speed_integrated_trace_->solve(now, total_area));
436 /* verify which event will happen before (max_duration or finish time) */
437 if (action.get_max_duration() != NO_MAX_DURATION &&
438 action.get_start_time() + action.get_max_duration() < action.get_finish_time())
439 min_finish = action.get_start_time() + action.get_max_duration();
441 min_finish = action.get_finish_time();
443 /* put the max duration time on heap */
444 if (action.get_max_duration() != NO_MAX_DURATION)
445 min_finish = action.get_start_time() + action.get_max_duration();
447 /* add in action heap */
448 if (min_finish != NO_MAX_DURATION)
449 get_model()->get_action_heap().update(&action, min_finish, ActionHeap::Type::unset);
451 get_model()->get_action_heap().remove(&action);
453 XBT_DEBUG("Update finish time: Cpu(%s) Action: %p, Start Time: %f Finish Time: %f Max duration %f", get_cname(),
454 &action, action.get_start_time(), action.get_finish_time(), action.get_max_duration());
456 /* remove from modified cpu */
460 bool CpuTi::is_used() const
462 return not action_set_.empty();
465 double CpuTi::get_speed_ratio()
467 speed_.scale = speed_integrated_trace_->get_power_scale(surf_get_clock());
468 return Cpu::get_speed_ratio();
471 /** @brief Update the remaining amount of actions */
472 void CpuTi::update_remaining_amount(double now)
474 /* already up to date */
475 if (last_update_ >= now)
478 /* compute the integration area */
479 double area_total = speed_integrated_trace_->integrate(last_update_, now) * speed_.peak;
480 XBT_DEBUG("Flops total: %f, Last update %f", area_total, last_update_);
481 for (CpuTiAction& action : action_set_) {
482 /* action not running, skip it */
483 if (action.get_state_set() != get_model()->get_started_action_set())
486 /* bogus priority, skip it */
487 if (action.get_sharing_penalty() <= 0)
490 /* action suspended, skip it */
491 if (not action.is_running())
494 /* action don't need update */
495 if (action.get_start_time() >= now)
498 /* skip action that are finishing now */
499 if (action.get_finish_time() >= 0 && action.get_finish_time() <= now)
502 /* update remaining */
503 action.update_remains(area_total / (sum_priority_ * action.get_sharing_penalty()));
504 XBT_DEBUG("Update remaining action(%p) remaining %f", &action, action.get_remains_no_update());
509 CpuAction* CpuTi::execution_start(double size)
511 XBT_IN("(%s,%g)", get_cname(), size);
512 auto* action = new CpuTiAction(this, size);
514 action_set_.push_back(*action); // Actually start the action
520 CpuAction* CpuTi::sleep(double duration)
523 duration = std::max(duration, sg_surf_precision);
525 XBT_IN("(%s,%g)", get_cname(), duration);
526 auto* action = new CpuTiAction(this, 1.0);
528 action->set_max_duration(duration);
529 action->set_suspend_state(Action::SuspendStates::SLEEPING);
530 if (duration == NO_MAX_DURATION)
531 action->set_state(Action::State::IGNORED);
533 action_set_.push_back(*action);
539 void CpuTi::set_modified(bool modified)
541 CpuTiList& modified_cpus = static_cast<CpuTiModel*>(get_model())->modified_cpus_;
543 if (not cpu_ti_hook.is_linked()) {
544 modified_cpus.push_back(*this);
547 if (cpu_ti_hook.is_linked())
548 xbt::intrusive_erase(modified_cpus, *this);
556 CpuTiAction::CpuTiAction(CpuTi* cpu, double cost) : CpuAction(cpu->get_model(), cost, not cpu->is_on()), cpu_(cpu)
558 cpu_->set_modified(true);
560 CpuTiAction::~CpuTiAction()
562 /* remove from action_set */
563 if (action_ti_hook.is_linked())
564 xbt::intrusive_erase(cpu_->action_set_, *this);
565 /* remove from heap */
566 get_model()->get_action_heap().remove(this);
567 cpu_->set_modified(true);
570 void CpuTiAction::set_state(Action::State state)
572 CpuAction::set_state(state);
573 cpu_->set_modified(true);
576 void CpuTiAction::cancel()
578 this->set_state(Action::State::FAILED);
579 get_model()->get_action_heap().remove(this);
580 cpu_->set_modified(true);
583 void CpuTiAction::suspend()
585 XBT_IN("(%p)", this);
587 set_suspend_state(Action::SuspendStates::SUSPENDED);
588 get_model()->get_action_heap().remove(this);
589 cpu_->set_modified(true);
594 void CpuTiAction::resume()
596 XBT_IN("(%p)", this);
597 if (is_suspended()) {
598 set_suspend_state(Action::SuspendStates::RUNNING);
599 cpu_->set_modified(true);
604 void CpuTiAction::set_max_duration(double duration)
608 XBT_IN("(%p,%g)", this, duration);
610 Action::set_max_duration(duration);
613 min_finish = (get_start_time() + get_max_duration()) < get_finish_time() ? (get_start_time() + get_max_duration())
616 min_finish = get_finish_time();
618 /* add in action heap */
619 get_model()->get_action_heap().update(this, min_finish, ActionHeap::Type::unset);
624 void CpuTiAction::set_sharing_penalty(double sharing_penalty)
626 XBT_IN("(%p,%g)", this, sharing_penalty);
627 set_sharing_penalty_no_update(sharing_penalty);
628 cpu_->set_modified(true);
632 double CpuTiAction::get_remains()
634 XBT_IN("(%p)", this);
635 cpu_->update_remaining_amount(surf_get_clock());
637 return get_remains_no_update();
640 } // namespace resource
641 } // namespace kernel
642 } // namespace simgrid