1 /* Copyright (c) 2013-2019. 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/trace_mgr.hpp"
8 #include "src/surf/surf_interface.hpp"
9 #include "surf/surf.hpp"
13 constexpr double EPSILON = 0.000000001;
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu_ti, surf_cpu, "Logging specific to the SURF CPU TRACE INTEGRATION module");
25 CpuTiProfile::CpuTiProfile(profile::Profile* profile)
29 unsigned nb_points = profile->event_list.size() + 1;
30 time_points_.reserve(nb_points);
31 integral_.reserve(nb_points);
32 for (auto const& val : profile->event_list) {
33 time_points_.push_back(time);
34 integral_.push_back(integral);
36 integral += val.date_ * val.value_;
38 time_points_.push_back(time);
39 integral_.push_back(integral);
43 * @brief Integrate trace
45 * Wrapper around surf_cpu_integrate_trace_simple() to get
48 * @param a Begin of interval
49 * @param b End of interval
50 * @return the integrate value. -1 if an error occurs.
52 double CpuTiTmgr::integrate(double a, double b)
54 if ((a < 0.0) || (a > b)) {
55 xbt_die("Error, invalid integration interval [%.2f,%.2f]. "
56 "You probably have a task executing with negative computation amount. Check your code.", a, b);
58 if (fabs(a - b) < EPSILON)
61 if (type_ == Type::FIXED) {
62 return (b - a) * value_;
66 if (fabs(ceil(a / last_time_) - a / last_time_) < EPSILON)
67 a_index = 1 + static_cast<int>(ceil(a / last_time_));
69 a_index = static_cast<int>(ceil(a / last_time_));
71 int b_index = static_cast<int>(floor(b / last_time_));
73 if (a_index > b_index) { /* Same chunk */
74 return profile_->integrate_simple(a - (a_index - 1) * last_time_, b - (b_index)*last_time_);
77 double first_chunk = profile_->integrate_simple(a - (a_index - 1) * last_time_, last_time_);
78 double middle_chunk = (b_index - a_index) * total_;
79 double last_chunk = profile_->integrate_simple(0.0, b - (b_index)*last_time_);
81 XBT_DEBUG("first_chunk=%.2f middle_chunk=%.2f last_chunk=%.2f\n", first_chunk, middle_chunk, last_chunk);
83 return (first_chunk + middle_chunk + last_chunk);
87 * @brief Auxiliary function to compute the integral between a and b.
88 * It simply computes the integrals at point a and b and returns the difference between them.
89 * @param a Initial point
90 * @param b Final point
92 double CpuTiProfile::integrate_simple(double a, double b)
94 return integrate_simple_point(b) - integrate_simple_point(a);
98 * @brief Auxiliary function to compute the integral at point a.
101 double CpuTiProfile::integrate_simple_point(double a)
105 int ind = binary_search(time_points_, a);
106 integral += integral_[ind];
108 XBT_DEBUG("a %f ind %d integral %f ind + 1 %f ind %f time +1 %f time %f", a, ind, integral, integral_[ind + 1],
109 integral_[ind], time_points_[ind + 1], time_points_[ind]);
110 double_update(&a_aux, time_points_[ind], sg_maxmin_precision * sg_surf_precision);
113 ((integral_[ind + 1] - integral_[ind]) / (time_points_[ind + 1] - time_points_[ind])) * (a - time_points_[ind]);
114 XBT_DEBUG("Integral a %f = %f", a, integral);
120 * @brief Computes the time needed to execute "amount" on cpu.
122 * Here, amount can span multiple trace periods
124 * @param a Initial time
125 * @param amount Amount to be executed
128 double CpuTiTmgr::solve(double a, double amount)
130 /* Fix very small negative numbers */
131 if ((a < 0.0) && (a > -EPSILON)) {
134 if ((amount < 0.0) && (amount > -EPSILON)) {
139 if ((a < 0.0) || (amount < 0.0)) {
140 XBT_CRITICAL ("Error, invalid parameters [a = %.2f, amount = %.2f]. "
141 "You probably have a task executing with negative computation amount. Check your code.", a, amount);
145 /* At this point, a and amount are positive */
146 if (amount < EPSILON)
149 /* Is the trace fixed ? */
150 if (type_ == Type::FIXED) {
151 return (a + (amount / value_));
154 XBT_DEBUG("amount %f total %f", amount, total_);
155 /* Reduce the problem to one where amount <= trace_total */
156 int quotient = static_cast<int>(floor(amount / total_));
157 double reduced_amount = (total_) * ((amount / total_) - floor(amount / total_));
158 double reduced_a = a - (last_time_) * static_cast<int>(floor(a / last_time_));
160 XBT_DEBUG("Quotient: %d reduced_amount: %f reduced_a: %f", quotient, reduced_amount, reduced_a);
162 /* Now solve for new_amount which is <= trace_total */
164 XBT_DEBUG("Solve integral: [%.2f, amount=%.2f]", reduced_a, reduced_amount);
165 double amount_till_end = integrate(reduced_a, last_time_);
167 if (amount_till_end > reduced_amount) {
168 reduced_b = profile_->solve_simple(reduced_a, reduced_amount);
170 reduced_b = last_time_ + profile_->solve_simple(0.0, reduced_amount - amount_till_end);
173 /* Re-map to the original b and amount */
174 return (last_time_) * static_cast<int>(floor(a / last_time_)) + (quotient * last_time_) + reduced_b;
178 * @brief Auxiliary function to solve integral.
179 * It returns the date when the requested amount of flops is available
180 * @param a Initial point
181 * @param amount Amount of flops
182 * @return The date when amount is available.
184 double CpuTiProfile::solve_simple(double a, double amount)
186 double integral_a = integrate_simple_point(a);
187 int ind = binary_search(integral_, integral_a + amount);
188 double time = time_points_[ind];
189 time += (integral_a + amount - integral_[ind]) /
190 ((integral_[ind + 1] - integral_[ind]) / (time_points_[ind + 1] - time_points_[ind]));
196 * @brief Auxiliary function to update the CPU speed scale.
198 * This function uses the trace structure to return the speed scale at the determined time a.
200 * @return CPU speed scale
202 double CpuTiTmgr::get_power_scale(double a)
204 double reduced_a = a - floor(a / last_time_) * last_time_;
205 int point = CpuTiProfile::binary_search(profile_->time_points_, reduced_a);
206 kernel::profile::DatedValue val = speed_profile_->event_list.at(point);
211 * @brief Creates a new integration trace from a tmgr_trace_t
213 * @param speed_trace CPU availability trace
214 * @param value Percentage of CPU speed available (useful to fixed tracing)
215 * @return Integration trace structure
217 CpuTiTmgr::CpuTiTmgr(kernel::profile::Profile* speed_profile, double value) : speed_profile_(speed_profile)
219 double total_time = 0.0;
220 profile_.reset(nullptr);
222 /* no availability file, fixed trace */
223 if (not speed_profile) {
226 XBT_DEBUG("No availability trace. Constant value = %f", value);
230 /* only one point available, fixed trace */
231 if (speed_profile->event_list.size() == 1) {
233 value_ = speed_profile->event_list.front().value_;
237 type_ = Type::DYNAMIC;
239 /* count the total time of trace file */
240 for (auto const& val : speed_profile->event_list)
241 total_time += val.date_;
243 profile_.reset(new CpuTiProfile(speed_profile));
244 last_time_ = total_time;
245 total_ = profile_->integrate_simple(0, total_time);
247 XBT_DEBUG("Total integral %f, last_time %f ", total_, last_time_);
251 * @brief Binary search in array.
252 * It returns the last point of the interval in which "a" is.
254 * @param a Value to search
255 * @return Index of point
257 int CpuTiProfile::binary_search(const std::vector<double>& array, double a)
261 auto pos = std::upper_bound(begin(array), end(array), a);
262 return std::distance(begin(array), pos) - 1;
269 void CpuTiModel::create_pm_vm_models()
271 xbt_assert(surf_cpu_model_pm == nullptr, "CPU model already initialized. This should not happen.");
272 xbt_assert(surf_cpu_model_vm == nullptr, "CPU model already initialized. This should not happen.");
274 surf_cpu_model_pm = new simgrid::kernel::resource::CpuTiModel();
275 surf_cpu_model_vm = new simgrid::kernel::resource::CpuTiModel();
278 CpuTiModel::CpuTiModel() : CpuModel(Model::UpdateAlgo::FULL)
280 all_existing_models.push_back(this);
283 CpuTiModel::~CpuTiModel()
285 surf_cpu_model_pm = nullptr;
288 kernel::resource::Cpu* CpuTiModel::create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate, int core)
290 return new CpuTi(this, host, speed_per_pstate, core);
293 double CpuTiModel::next_occuring_event(double now)
295 double min_action_duration = -1;
297 /* iterates over modified cpus to update share resources */
298 for (auto it = std::begin(modified_cpus_); it != std::end(modified_cpus_);) {
300 ++it; // increment iterator here since the following call to ti.update_actions_finish_time() may invalidate it
301 cpu.update_actions_finish_time(now);
304 /* get the min next event if heap not empty */
305 if (not get_action_heap().empty())
306 min_action_duration = get_action_heap().top_date() - now;
308 XBT_DEBUG("Share resources, min next event date: %f", min_action_duration);
310 return min_action_duration;
313 void CpuTiModel::update_actions_state(double now, double /*delta*/)
315 while (not get_action_heap().empty() && double_equals(get_action_heap().top_date(), now, sg_surf_precision)) {
316 CpuTiAction* action = static_cast<CpuTiAction*>(get_action_heap().pop());
317 XBT_DEBUG("Action %p: finish", action);
318 action->finish(kernel::resource::Action::State::FINISHED);
319 /* update remaining amount of all actions */
320 action->cpu_->update_remaining_amount(surf_get_clock());
327 CpuTi::CpuTi(CpuTiModel* model, simgrid::s4u::Host* host, const std::vector<double>& speed_per_pstate, int core)
328 : Cpu(model, host, speed_per_pstate, core)
330 xbt_assert(core == 1, "Multi-core not handled by this model yet");
332 speed_.peak = speed_per_pstate.front();
333 XBT_DEBUG("CPU create: peak=%f", speed_.peak);
335 speed_integrated_trace_ = new CpuTiTmgr(nullptr, 1 /*scale*/);
341 delete speed_integrated_trace_;
343 void CpuTi::set_speed_profile(kernel::profile::Profile* profile)
345 delete speed_integrated_trace_;
346 speed_integrated_trace_ = new CpuTiTmgr(profile, speed_.scale);
348 /* add a fake trace event if periodicity == 0 */
349 if (profile && profile->event_list.size() > 1) {
350 kernel::profile::DatedValue val = profile->event_list.back();
351 if (val.date_ < 1e-12) {
352 simgrid::kernel::profile::Profile* prof = new simgrid::kernel::profile::Profile();
353 speed_.event = prof->schedule(&future_evt_set, this);
358 void CpuTi::apply_event(kernel::profile::Event* event, double value)
360 if (event == speed_.event) {
361 XBT_DEBUG("Speed changed in trace! New fixed value: %f", value);
363 /* update remaining of actions and put in modified cpu list */
364 update_remaining_amount(surf_get_clock());
368 delete speed_integrated_trace_;
369 speed_integrated_trace_ = new CpuTiTmgr(value);
371 speed_.scale = value;
372 tmgr_trace_event_unref(&speed_.event);
374 } else if (event == state_event_) {
377 XBT_VERB("Restart processes on host %s", get_host()->get_cname());
378 get_host()->turn_on();
381 get_host()->turn_off();
382 double date = surf_get_clock();
384 /* put all action running on cpu to failed */
385 for (CpuTiAction& action : action_set_) {
386 if (action.get_state() == kernel::resource::Action::State::INITED ||
387 action.get_state() == kernel::resource::Action::State::STARTED ||
388 action.get_state() == kernel::resource::Action::State::IGNORED) {
389 action.set_finish_time(date);
390 action.set_state(kernel::resource::Action::State::FAILED);
391 get_model()->get_action_heap().remove(&action);
395 tmgr_trace_event_unref(&state_event_);
398 xbt_die("Unknown event!\n");
402 /** Update the actions that are running on this CPU (which was modified recently) */
403 void CpuTi::update_actions_finish_time(double now)
405 /* update remaining amount of actions */
406 update_remaining_amount(now);
408 /* Compute the sum of priorities for the actions running on that CPU */
410 for (CpuTiAction const& action : action_set_) {
411 /* action not running, skip it */
412 if (action.get_state_set() != surf_cpu_model_pm->get_started_action_set())
415 /* bogus priority, skip it */
416 if (action.get_priority() <= 0)
419 /* action suspended, skip it */
420 if (not action.is_running())
423 sum_priority_ += 1.0 / action.get_priority();
426 for (CpuTiAction& action : action_set_) {
427 double min_finish = -1;
428 /* action not running, skip it */
429 if (action.get_state_set() != surf_cpu_model_pm->get_started_action_set())
432 /* verify if the action is really running on cpu */
433 if (action.is_running() && action.get_priority() > 0) {
434 /* total area needed to finish the action. Used in trace integration */
435 double total_area = (action.get_remains() * sum_priority_ * action.get_priority()) / speed_.peak;
437 action.set_finish_time(speed_integrated_trace_->solve(now, total_area));
438 /* verify which event will happen before (max_duration or finish time) */
439 if (action.get_max_duration() != NO_MAX_DURATION &&
440 action.get_start_time() + action.get_max_duration() < action.get_finish_time())
441 min_finish = action.get_start_time() + action.get_max_duration();
443 min_finish = action.get_finish_time();
445 /* put the max duration time on heap */
446 if (action.get_max_duration() != NO_MAX_DURATION)
447 min_finish = action.get_start_time() + action.get_max_duration();
449 /* add in action heap */
450 if (min_finish != NO_MAX_DURATION)
451 get_model()->get_action_heap().update(&action, min_finish, kernel::resource::ActionHeap::Type::unset);
453 get_model()->get_action_heap().remove(&action);
455 XBT_DEBUG("Update finish time: Cpu(%s) Action: %p, Start Time: %f Finish Time: %f Max duration %f", get_cname(),
456 &action, action.get_start_time(), action.get_finish_time(), action.get_max_duration());
458 /* remove from modified cpu */
462 bool CpuTi::is_used()
464 return not action_set_.empty();
467 double CpuTi::get_speed_ratio()
469 speed_.scale = speed_integrated_trace_->get_power_scale(surf_get_clock());
470 return Cpu::get_speed_ratio();
473 /** @brief Update the remaining amount of actions */
474 void CpuTi::update_remaining_amount(double now)
476 /* already up to date */
477 if (last_update_ >= now)
480 /* compute the integration area */
481 double area_total = speed_integrated_trace_->integrate(last_update_, now) * speed_.peak;
482 XBT_DEBUG("Flops total: %f, Last update %f", area_total, last_update_);
483 for (CpuTiAction& action : action_set_) {
484 /* action not running, skip it */
485 if (action.get_state_set() != get_model()->get_started_action_set())
488 /* bogus priority, skip it */
489 if (action.get_priority() <= 0)
492 /* action suspended, skip it */
493 if (not action.is_running())
496 /* action don't need update */
497 if (action.get_start_time() >= now)
500 /* skip action that are finishing now */
501 if (action.get_finish_time() >= 0 && action.get_finish_time() <= now)
504 /* update remaining */
505 action.update_remains(area_total / (sum_priority_ * action.get_priority()));
506 XBT_DEBUG("Update remaining action(%p) remaining %f", &action, action.get_remains_no_update());
511 kernel::resource::CpuAction* CpuTi::execution_start(double size)
513 XBT_IN("(%s,%g)", get_cname(), size);
514 CpuTiAction* action = new CpuTiAction(this, size);
516 action_set_.push_back(*action); // Actually start the action
522 kernel::resource::CpuAction* CpuTi::sleep(double duration)
525 duration = std::max(duration, sg_surf_precision);
527 XBT_IN("(%s,%g)", get_cname(), duration);
528 CpuTiAction* action = new CpuTiAction(this, 1.0);
530 action->set_max_duration(duration);
531 action->set_suspend_state(kernel::resource::Action::SuspendStates::SLEEPING);
532 if (duration == NO_MAX_DURATION)
533 action->set_state(simgrid::kernel::resource::Action::State::IGNORED);
535 action_set_.push_back(*action);
541 void CpuTi::set_modified(bool modified)
543 CpuTiList& modified_cpus = static_cast<CpuTiModel*>(get_model())->modified_cpus_;
545 if (not cpu_ti_hook.is_linked()) {
546 modified_cpus.push_back(*this);
549 if (cpu_ti_hook.is_linked())
550 simgrid::xbt::intrusive_erase(modified_cpus, *this);
558 CpuTiAction::CpuTiAction(CpuTi* cpu, double cost) : CpuAction(cpu->get_model(), cost, not cpu->is_on()), cpu_(cpu)
560 cpu_->set_modified(true);
562 CpuTiAction::~CpuTiAction()
564 /* remove from action_set */
565 if (action_ti_hook.is_linked())
566 simgrid::xbt::intrusive_erase(cpu_->action_set_, *this);
567 /* remove from heap */
568 get_model()->get_action_heap().remove(this);
569 cpu_->set_modified(true);
572 void CpuTiAction::set_state(Action::State state)
574 CpuAction::set_state(state);
575 cpu_->set_modified(true);
578 void CpuTiAction::cancel()
580 this->set_state(Action::State::FAILED);
581 get_model()->get_action_heap().remove(this);
582 cpu_->set_modified(true);
585 void CpuTiAction::suspend()
587 XBT_IN("(%p)", this);
589 set_suspend_state(Action::SuspendStates::SUSPENDED);
590 get_model()->get_action_heap().remove(this);
591 cpu_->set_modified(true);
596 void CpuTiAction::resume()
598 XBT_IN("(%p)", this);
599 if (is_suspended()) {
600 set_suspend_state(Action::SuspendStates::RUNNING);
601 cpu_->set_modified(true);
606 void CpuTiAction::set_max_duration(double duration)
610 XBT_IN("(%p,%g)", this, duration);
612 Action::set_max_duration(duration);
615 min_finish = (get_start_time() + get_max_duration()) < get_finish_time() ? (get_start_time() + get_max_duration())
618 min_finish = get_finish_time();
620 /* add in action heap */
621 get_model()->get_action_heap().update(this, min_finish, kernel::resource::ActionHeap::Type::unset);
626 void CpuTiAction::set_priority(double priority)
628 XBT_IN("(%p,%g)", this, priority);
629 set_priority_no_update(priority);
630 cpu_->set_modified(true);
634 double CpuTiAction::get_remains()
636 XBT_IN("(%p)", this);
637 cpu_->update_remaining_amount(surf_get_clock());
639 return get_remains_no_update();
642 } // namespace resource
643 } // namespace kernel
644 } // namespace simgrid