1 /* Copyright (c) 2010-2019. 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. */
6 #include "simgrid/plugins/energy.h"
7 #include "simgrid/s4u/Engine.hpp"
8 #include "simgrid/s4u/Exec.hpp"
9 #include "src/include/surf/surf.hpp"
10 #include "src/kernel/activity/ExecImpl.hpp"
11 #include "src/plugins/vm/VirtualMachineImpl.hpp"
12 #include "src/surf/cpu_interface.hpp"
14 #include <boost/algorithm/string/classification.hpp>
15 #include <boost/algorithm/string/split.hpp>
17 SIMGRID_REGISTER_PLUGIN(host_energy, "Cpu energy consumption.", &sg_host_energy_plugin_init)
19 /** @defgroup plugin_host_energy
22 This is the energy plugin, enabling to account not only for computation time, but also for the dissipated energy in the
24 To activate this plugin, first call :cpp:func:`sg_host_energy_plugin_init()` before your :cpp:func:`MSG_init()`, and then use
25 :cpp:func:`MSG_host_get_consumed_energy()` to retrieve the consumption of a given host.
27 When the host is on, this energy consumption naturally depends on both the current CPU load and the host energy profile.
28 According to our measurements, the consumption is somehow linear in the amount of cores at full speed, with an
29 abnormality when all the cores are idle. The full details are in `our scientific paper <https://hal.inria.fr/hal-01523608>`_
32 As a result, our energy model takes 4 parameters:
34 - ``Idle`` wattage (i.e., instantaneous consumption in Watt) when your host is up and running, but without anything to do.
35 - ``Epsilon`` wattage when all cores are at 0 or epsilon%, but not in Idle state.
36 - ``AllCores`` wattage when all cores of the host are at 100%.
37 - ``Off`` wattage when the host is turned off.
39 Here is an example of XML declaration:
43 <host id="HostA" speed="100.0Mf" core="4">
44 <prop id="wattage_per_state" value="100.0:120.0:200.0" />
45 <prop id="wattage_off" value="10" />
48 If only two values are given, ``Idle`` is used for the missing ``Epsilon`` value.
50 This example gives the following parameters: ``Off`` is 10 Watts; ``Idle`` is 100 Watts; ``Epsilon`` is 120 Watts and
51 ``AllCores`` is 200 Watts.
52 This is enough to compute the wattage as a function of the amount of loaded cores:
57 <tr><th>#Cores loaded</th><th>Wattage</th><th>Explanation</th></tr>
58 <tr><td>0 (idle)</td><td> 100 Watts </td><td> Idle value</td></tr>
59 <tr><td>0 (not idle)</td><td> 120 Watts</td><td> Epsilon value</td></tr>
60 <tr><td>1</td><td> 140 Watts</td><td> Linear extrapolation between Epsilon and AllCores</td></tr>
61 <tr><td>2</td><td> 160 Watts</td><td> Linear extrapolation between Epsilon and AllCores</td></tr>
62 <tr><td>3</td><td> 180 Watts</td><td> Linear extrapolation between Epsilon and AllCores</td></tr>
63 <tr><td>4</td><td> 200 Watts</td><td> AllCores value</td></tr>
69 <h4>How does DVFS interact with the host energy model?</h4>
71 If your host has several DVFS levels (several pstates), then you should give the energetic profile of each pstate level:
75 <host id="HostC" speed="100.0Mf,50.0Mf,20.0Mf" core="4">
76 <prop id="wattage_per_state"
77 value="95.0:120.0:200.0, 93.0:115.0:170.0, 90.0:110.0:150.0" />
78 <prop id="wattage_off" value="10" />
81 This encodes the following values:
86 <tr><th>pstate</th><th>Performance</th><th>Idle</th><th>Epsilon</th><th>AllCores</th></tr>
87 <tr><td>0</td><td>100 Mflop/s</td><td>95 Watts</td><td>120 Watts</td><td>200 Watts</td></tr>
88 <tr><td>1</td><td>50 Mflop/s</td><td>93 Watts</td><td>115 Watts</td><td>170 Watts</td></tr>
89 <tr><td>2</td><td>20 Mflop/s</td><td>90 Watts</td><td>110 Watts</td><td>150 Watts</td></tr>
92 To change the pstate of a given CPU, use the following functions:
93 :cpp:func:`MSG_host_get_nb_pstates()`, :cpp:func:`simgrid::s4u::Host::set_pstate()`, :cpp:func:`MSG_host_get_power_peak_at()`.
97 <h4>How accurate are these models?</h4>
99 This model cannot be more accurate than your instantiation: with the default values, your result will not be accurate at
100 all. You can still get accurate energy prediction, provided that you carefully instantiate the model.
101 The first step is to ensure that your timing prediction match perfectly. But this is only the first step of the path,
102 and you really want to read `this paper <https://hal.inria.fr/hal-01523608>`_ to see all what you need to do
103 before you can get accurate energy predictions.
108 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf, "Logging specific to the SURF energy plugin");
110 // Forwards declaration needed to make this function a friend (because friends have external linkage by default)
111 static void on_simulation_end();
123 PowerRange(double idle, double epsilon, double max) : idle_(idle), epsilon_(epsilon), max_(max), slope_(max-epsilon) {}
127 friend void ::on_simulation_end(); // For access to host_was_used_
129 static simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> EXTENSION_ID;
131 explicit HostEnergy(simgrid::s4u::Host* ptr);
134 double get_current_watts_value();
135 double get_current_watts_value(double cpu_load);
136 double get_consumed_energy();
137 double get_watt_idle_at(int pstate);
138 double get_watt_min_at(int pstate);
139 double get_watt_max_at(int pstate);
140 double get_power_range_slope_at(int pstate);
144 void init_watts_range_list();
145 simgrid::s4u::Host* host_ = nullptr;
146 /*< List of (idle_power, epsilon_power, max_power) tuple corresponding to each cpu pstate */
147 std::vector<PowerRange> power_range_watts_list_;
149 /* We need to keep track of what pstate has been used, as we will sometimes be notified only *after* a pstate has been
150 * used (but we need to update the energy consumption with the old pstate!)
153 const int pstate_off_ = -1;
155 /* Only used to split total energy into unused/used hosts.
156 * If you want to get this info for something else, rather use the host_load plugin
158 bool host_was_used_ = false;
160 double watts_off_ = 0.0; /*< Consumption when the machine is turned off (shutdown) */
161 double total_energy_ = 0.0; /*< Total energy consumed by the host */
162 double last_updated_; /*< Timestamp of the last energy update event*/
165 simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> HostEnergy::EXTENSION_ID;
167 /* Computes the consumption so far. Called lazily on need. */
168 void HostEnergy::update()
170 double start_time = this->last_updated_;
171 double finish_time = surf_get_clock();
173 // We may have start == finish if the past consumption was updated since the simcall was started
174 // for example if 2 actors requested to update the same host's consumption in a given scheduling round.
176 // Even in this case, we need to save the pstate for the next call (after this if),
177 // which may have changed since that recent update.
178 if (start_time < finish_time) {
179 double previous_energy = this->total_energy_;
181 double instantaneous_power_consumption = this->get_current_watts_value();
183 double energy_this_step = instantaneous_power_consumption * (finish_time - start_time);
185 // TODO Trace: Trace energy_this_step from start_time to finish_time in host->getName()
187 this->total_energy_ = previous_energy + energy_this_step;
188 this->last_updated_ = finish_time;
190 XBT_DEBUG("[update_energy of %s] period=[%.8f-%.8f]; current speed=%.2E flop/s (pstate %i); total consumption "
191 "before: %.8f J -> added now: %.8f J",
192 host_->get_cname(), start_time, finish_time, host_->get_pstate_speed(this->pstate_), this->pstate_,
193 previous_energy, energy_this_step);
196 /* Save data for the upcoming time interval: whether it's on/off and the pstate if it's on */
197 this->pstate_ = host_->is_on() ? host_->get_pstate() : pstate_off_;
200 HostEnergy::HostEnergy(simgrid::s4u::Host* ptr) : host_(ptr), last_updated_(surf_get_clock())
202 init_watts_range_list();
204 const char* off_power_str = host_->get_property("wattage_off");
205 if (off_power_str == nullptr) {
206 off_power_str = host_->get_property("watt_off");
208 static bool warned = false;
209 if (off_power_str != nullptr && not warned) {
211 XBT_WARN("Please use 'wattage_off' instead of 'watt_off' to define the idle wattage of hosts in your XML.");
214 if (off_power_str != nullptr) {
216 this->watts_off_ = std::stod(std::string(off_power_str));
217 } catch (const std::invalid_argument&) {
218 throw std::invalid_argument(std::string("Invalid value for property wattage_off of host ") + host_->get_cname() +
219 ": " + off_power_str);
222 /* watts_off is 0 by default */
225 HostEnergy::~HostEnergy() = default;
227 double HostEnergy::get_watt_idle_at(int pstate)
229 xbt_assert(not power_range_watts_list_.empty(), "No power range properties specified for host %s",
231 return power_range_watts_list_[pstate].idle_;
234 double HostEnergy::get_watt_min_at(int pstate)
236 xbt_assert(not power_range_watts_list_.empty(), "No power range properties specified for host %s",
238 return power_range_watts_list_[pstate].epsilon_;
241 double HostEnergy::get_watt_max_at(int pstate)
243 xbt_assert(not power_range_watts_list_.empty(), "No power range properties specified for host %s",
245 return power_range_watts_list_[pstate].max_;
248 double HostEnergy::get_power_range_slope_at(int pstate)
250 xbt_assert(not power_range_watts_list_.empty(), "No power range properties specified for host %s",
252 return power_range_watts_list_[pstate].slope_;
255 /** @brief Computes the power consumed by the host according to the current situation
257 * - If the host is off, that's the watts_off value
258 * - if it's on, take the current pstate and the current processor load into account */
259 double HostEnergy::get_current_watts_value()
261 if (this->pstate_ == pstate_off_) // The host is off (or was off at the beginning of this time interval)
262 return this->watts_off_;
264 double current_speed = host_->get_pstate_speed(this->pstate_);
268 if (current_speed <= 0)
269 // Some users declare a pstate of speed 0 flops (e.g., to model boot time).
270 // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
273 cpu_load = host_->get_load() / current_speed;
275 /* Divide by the number of cores here to have a value between 0 and 1 */
276 cpu_load /= host_->get_core_count();
278 if (cpu_load > 1) // This condition is true for energy_ptask on 32 bits, even if cpu_load is displayed as 1.000000
279 cpu_load = 1; // That may be an harmless rounding error?
281 host_was_used_ = true;
284 return get_current_watts_value(cpu_load);
287 /** @brief Computes the power that the host would consume at the provided processor load
289 * Whether the host is ON or OFF is not taken into account.
291 double HostEnergy::get_current_watts_value(double cpu_load)
293 xbt_assert(not power_range_watts_list_.empty(), "No power range properties specified for host %s",
296 /* Return watts_off if pstate == pstate_off (ie, if the host is off) */
297 if (this->pstate_ == pstate_off_) {
301 PowerRange power_range = power_range_watts_list_.at(this->pstate_);
302 double current_power;
307 * Something is going on, the host is not idle.
309 * The power consumption follows the regular model:
310 * P(cpu_load) = Pstatic + Pdynamic * cpu_load
311 * where Pstatic = power_range.epsilon_ and Pdynamic = power_range.slope_
312 * and the cpu_load is a value between 0 and 1.
314 current_power = power_range.epsilon_ + cpu_load * power_range.slope_;
318 /* The host is idle, take the dedicated value! */
319 current_power = power_range.idle_;
322 XBT_DEBUG("[get_current_watts] pstate=%i, epsilon_power=%f, max_power=%f, slope=%f", this->pstate_, power_range.epsilon_,
323 power_range.max_, power_range.slope_);
324 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
326 return current_power;
329 double HostEnergy::get_consumed_energy()
331 if (last_updated_ < surf_get_clock()) // We need to simcall this as it modifies the environment
332 simgrid::kernel::actor::simcall(std::bind(&HostEnergy::update, this));
334 return total_energy_;
337 void HostEnergy::init_watts_range_list()
339 const char* old_prop = host_->get_property("watt_per_state");
340 if (old_prop != nullptr) {
341 std::vector<std::string> all_power_values;
342 boost::split(all_power_values, old_prop, boost::is_any_of(","));
344 xbt_assert(all_power_values.size() == (unsigned)host_->get_pstate_count(),
345 "Invalid XML file. Found %zu energetic profiles for %d pstates", all_power_values.size(),
346 host_->get_pstate_count());
348 // XBT_ATTRIB_DEPRECATED_v328: putting this macro name here so that we find it during the deprecation cleanups
349 std::string msg = std::string("DEPRECATION WARNING: Property 'watt_per_state' will only work until v3.28.\n");
350 msg += std::string("The old syntax 'Idle:OneCore:AllCores' must be converted into 'Idle:Epsilon:AllCores' to "
351 "properly model the consumption of non-whole tasks on mono-core hosts. Here are the values to "
353 host_->get_cname() + "' in your XML file:\n";
354 msg += " <prop id=\"wattage_per_state\" value=\"";
355 for (auto const& current_power_values_str : all_power_values) {
356 std::vector<std::string> current_power_values;
357 boost::split(current_power_values, current_power_values_str, boost::is_any_of(":"));
358 double p_idle = xbt_str_parse_double((current_power_values.at(0)).c_str(),
359 "Invalid obsolete XML file. Fix your watt_per_state property.");
363 if (current_power_values.size() == 3) {
364 double p_one_core = xbt_str_parse_double((current_power_values.at(1)).c_str(),
365 "Invalid obsolete XML file. Fix your watt_per_state property.");
366 p_full = xbt_str_parse_double((current_power_values.at(2)).c_str(),
367 "Invalid obsolete XML file. Fix your watt_per_state property.");
368 if (host_->get_core_count() == 1) {
371 p_epsilon = p_one_core - ((p_full - p_one_core) / (host_->get_core_count() - 1));
373 } else { // consuption given with idle and full only
374 p_full = xbt_str_parse_double((current_power_values.at(1)).c_str(),
375 "Invalid obsolete XML file. Fix your watt_per_state property.");
376 if (host_->get_core_count() == 1) {
383 PowerRange range(p_idle, p_epsilon, p_full);
384 power_range_watts_list_.push_back(range);
386 msg += std::to_string(p_idle) + ":" + std::to_string(p_epsilon) + ":" + std::to_string(p_full);
389 msg.pop_back(); // Remove the extraneous ','
391 XBT_WARN("%s", msg.c_str());
395 const char* all_power_values_str = host_->get_property("wattage_per_state");
396 if (all_power_values_str == nullptr) {
397 /* If no power values are given, we assume it's 0 everywhere */
398 XBT_DEBUG("No energetic profiles given for host %s, using 0 W by default.", host_->get_cname());
399 for (int i = 0; i < host_->get_pstate_count(); ++i) {
400 PowerRange range(0,0,0);
401 power_range_watts_list_.push_back(range);
406 std::vector<std::string> all_power_values;
407 boost::split(all_power_values, all_power_values_str, boost::is_any_of(","));
408 XBT_DEBUG("%s: power properties: %s", host_->get_cname(), all_power_values_str);
410 xbt_assert(all_power_values.size() == (unsigned)host_->get_pstate_count(),
411 "Invalid XML file. Found %zu energetic profiles for %d pstates", all_power_values.size(),
412 host_->get_pstate_count());
415 for (auto const& current_power_values_str : all_power_values) {
416 /* retrieve the power values associated with the pstate i */
417 std::vector<std::string> current_power_values;
418 boost::split(current_power_values, current_power_values_str, boost::is_any_of(":"));
420 xbt_assert(current_power_values.size() == 2 || current_power_values.size() == 3,
421 "Power properties incorrectly defined for host %s."
422 "It should be 'Idle:AllCores' (or 'Idle:Epsilon:AllCores') power values.",
426 double epsilon_power;
429 char* msg_idle = bprintf("Invalid Idle value for pstate %d on host %s: %%s", i, host_->get_cname());
430 char* msg_epsilon = bprintf("Invalid Epsilon value for pstate %d on host %s: %%s", i, host_->get_cname());
431 char* msg_max = bprintf("Invalid AllCores value for pstate %d on host %s: %%s", i, host_->get_cname());
433 idle_power = xbt_str_parse_double((current_power_values.at(0)).c_str(), msg_idle);
434 if (current_power_values.size() == 2) { // Case: Idle:AllCores
435 epsilon_power = xbt_str_parse_double((current_power_values.at(0)).c_str(), msg_idle);
436 max_power = xbt_str_parse_double((current_power_values.at(1)).c_str(), msg_max);
437 } else { // Case: Idle:Epsilon:AllCores
438 epsilon_power = xbt_str_parse_double((current_power_values.at(1)).c_str(), msg_epsilon);
439 max_power = xbt_str_parse_double((current_power_values.at(2)).c_str(), msg_max);
442 XBT_DEBUG("Creating PowerRange for host %s. Idle:%f, Epsilon:%f, AllCores:%f.", host_->get_cname(), idle_power, epsilon_power, max_power);
444 PowerRange range(idle_power, epsilon_power, max_power);
445 power_range_watts_list_.push_back(range);
447 xbt_free(msg_epsilon);
452 } // namespace plugin
453 } // namespace simgrid
455 using simgrid::plugin::HostEnergy;
457 /* **************************** events callback *************************** */
458 static void on_creation(simgrid::s4u::Host& host)
460 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
463 // TODO Trace: set to zero the energy variable associated to host->getName()
465 host.extension_set(new HostEnergy(&host));
468 static void on_action_state_change(simgrid::kernel::resource::CpuAction const& action,
469 simgrid::kernel::resource::Action::State /*previous*/)
471 for (simgrid::kernel::resource::Cpu* const& cpu : action.cpus()) {
472 simgrid::s4u::Host* host = cpu->get_host();
473 if (host != nullptr) {
475 // If it's a VM, take the corresponding PM
476 simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
477 if (vm) // If it's a VM, take the corresponding PM
480 // Get the host_energy extension for the relevant host
481 HostEnergy* host_energy = host->extension<HostEnergy>();
483 if (host_energy->last_updated_ < surf_get_clock())
484 host_energy->update();
489 /* This callback is fired either when the host changes its state (on/off) ("onStateChange") or its speed
490 * (because the user changed the pstate, or because of external trace events) ("onSpeedChange") */
491 static void on_host_change(simgrid::s4u::Host const& host)
493 if (dynamic_cast<simgrid::s4u::VirtualMachine const*>(&host)) // Ignore virtual machines
496 HostEnergy* host_energy = host.extension<HostEnergy>();
498 host_energy->update();
501 static void on_host_destruction(simgrid::s4u::Host const& host)
503 if (dynamic_cast<simgrid::s4u::VirtualMachine const*>(&host)) // Ignore virtual machines
506 XBT_INFO("Energy consumption of host %s: %f Joules", host.get_cname(),
507 host.extension<HostEnergy>()->get_consumed_energy());
510 static void on_simulation_end()
512 std::vector<simgrid::s4u::Host*> hosts = simgrid::s4u::Engine::get_instance()->get_all_hosts();
514 double total_energy = 0.0; // Total energy consumption (whole platform)
515 double used_hosts_energy = 0.0; // Energy consumed by hosts that computed something
516 for (size_t i = 0; i < hosts.size(); i++) {
517 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(hosts[i]) == nullptr) { // Ignore virtual machines
519 double energy = hosts[i]->extension<HostEnergy>()->get_consumed_energy();
520 total_energy += energy;
521 if (hosts[i]->extension<HostEnergy>()->host_was_used_)
522 used_hosts_energy += energy;
525 XBT_INFO("Total energy consumption: %f Joules (used hosts: %f Joules; unused/idle hosts: %f)", total_energy,
526 used_hosts_energy, total_energy - used_hosts_energy);
529 /* **************************** Public interface *************************** */
531 /** @ingroup plugin_host_energy
532 * @brief Enable host energy plugin
533 * @details Enable energy plugin to get joules consumption of each cpu. Call this function before #MSG_init().
535 void sg_host_energy_plugin_init()
537 if (HostEnergy::EXTENSION_ID.valid())
540 HostEnergy::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostEnergy>();
542 simgrid::s4u::Host::on_creation.connect(&on_creation);
543 simgrid::s4u::Host::on_state_change.connect(&on_host_change);
544 simgrid::s4u::Host::on_speed_change.connect(&on_host_change);
545 simgrid::s4u::Host::on_destruction.connect(&on_host_destruction);
546 simgrid::s4u::Engine::on_simulation_end.connect(&on_simulation_end);
547 simgrid::kernel::resource::CpuAction::on_state_change.connect(&on_action_state_change);
548 // We may only have one actor on a node. If that actor executes something like
549 // compute -> recv -> compute
550 // the recv operation will not trigger a "CpuAction::on_state_change". This means
551 // that the next trigger would be the 2nd compute, hence ignoring the idle time
552 // during the recv call. By updating at the beginning of a compute, we can
553 // fix that. (If the cpu is not idle, this is not required.)
554 simgrid::s4u::Exec::on_start.connect([](simgrid::s4u::Actor const&, simgrid::s4u::Exec const& activity) {
555 if (activity.get_host_number() == 1) { // We only run on one host
556 simgrid::s4u::Host* host = activity.get_host();
557 simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
560 xbt_assert(host != nullptr);
561 host->extension<HostEnergy>()->update();
566 /** @ingroup plugin_host_energy
567 * @brief updates the consumption of all hosts
569 * After this call, sg_host_get_consumed_energy() will not interrupt your process
570 * (until after the next clock update).
572 void sg_host_energy_update_all()
574 simgrid::kernel::actor::simcall([]() {
575 std::vector<simgrid::s4u::Host*> list = simgrid::s4u::Engine::get_instance()->get_all_hosts();
576 for (auto const& host : list)
577 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(host) == nullptr) { // Ignore virtual machines
578 xbt_assert(host != nullptr);
579 host->extension<HostEnergy>()->update();
584 /** @ingroup plugin_host_energy
585 * @brief Returns the total energy consumed by the host so far (in Joules)
587 * Please note that since the consumption is lazily updated, it may require a simcall to update it.
588 * The result is that the actor requesting this value will be interrupted,
589 * the value will be updated in kernel mode before returning the control to the requesting actor.
591 double sg_host_get_consumed_energy(sg_host_t host)
593 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
594 "The Energy plugin is not active. Please call sg_host_energy_plugin_init() during initialization.");
595 return host->extension<HostEnergy>()->get_consumed_energy();
598 /** @ingroup plugin_host_energy
599 * @brief Get the amount of watt dissipated when the host is idling
601 double sg_host_get_idle_consumption(sg_host_t host)
603 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
604 "The Energy plugin is not active. Please call sg_host_energy_plugin_init() during initialization.");
605 return host->extension<HostEnergy>()->get_watt_idle_at(0);
608 /** @ingroup plugin_host_energy
609 * @brief Get the amount of watt dissipated at the given pstate when the host is idling
611 double sg_host_get_idle_consumption_at(sg_host_t host, int pstate)
613 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
614 "The Energy plugin is not active. Please call sg_host_energy_plugin_init() during initialization.");
615 return host->extension<HostEnergy>()->get_watt_idle_at(pstate);
618 /** @ingroup plugin_host_energy
619 * @brief Get the amount of watt dissipated at the given pstate when the host is at 0 or epsilon% CPU usage.
621 double sg_host_get_wattmin_at(sg_host_t host, int pstate)
623 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
624 "The Energy plugin is not active. Please call sg_host_energy_plugin_init() during initialization.");
625 return host->extension<HostEnergy>()->get_watt_min_at(pstate);
627 /** @ingroup plugin_host_energy
628 * @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100%
630 double sg_host_get_wattmax_at(sg_host_t host, int pstate)
632 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
633 "The Energy plugin is not active. Please call sg_host_energy_plugin_init() during initialization.");
634 return host->extension<HostEnergy>()->get_watt_max_at(pstate);
636 /** @ingroup plugin_host_energy
637 * @brief Returns the power slope at the given pstate
639 double sg_host_get_power_range_slope_at(sg_host_t host, int pstate)
641 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
642 "The Energy plugin is not active. Please call sg_host_energy_plugin_init() during initialization.");
643 return host->extension<HostEnergy>()->get_power_range_slope_at(pstate);
645 /** @ingroup plugin_host_energy
646 * @brief Returns the current consumption of the host
648 double sg_host_get_current_consumption(sg_host_t host)
650 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
651 "The Energy plugin is not active. Please call sg_host_energy_plugin_init() during initialization.");
652 return host->extension<HostEnergy>()->get_current_watts_value();