1 /* Copyright (c) 2010, 2012-2016. 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/simix.hpp"
8 #include "src/plugins/vm/VirtualMachineImpl.hpp"
9 #include "src/surf/cpu_interface.hpp"
11 #include <boost/algorithm/string/classification.hpp>
12 #include <boost/algorithm/string/split.hpp>
13 #include <simgrid/s4u/engine.hpp>
18 /** @addtogroup SURF_plugin_energy
21 This is the energy plugin, enabling to account not only for computation time,
22 but also for the dissipated energy in the simulated platform.
24 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as
28 <host id="HostA" power="100.0Mf" cores="8">
29 <prop id="watt_per_state" value="100.0:120.0:200.0" />
30 <prop id="watt_off" value="10" />
34 The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
35 If only one care is active, it will dissipate 120 Watts. If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 153.33 Watts.
36 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these
37 values are arbitrary).
39 If your CPU is using pstates, then you can provide one consumption interval per pstate.
42 <host id="HostB" power="100.0Mf,50.0Mf,20.0Mf" pstate="0" >
43 <prop id="watt_per_state" value="95.0:120.0:200.0, 93.0:115.0:170.0, 90.0:110.0:150.0" />
44 <prop id="watt_off" value="10" />
48 That host has 3 levels of performance with the following performance: 100 Mflop/s, 50 Mflop/s or 20 Mflop/s.
49 It starts at pstate 0 (ie, at 100 Mflop/s). In this case, you have to specify one interval per pstate in the
50 watt_per_state property.
51 In this example, the idle consumption is 95 Watts, 93 Watts and 90 Watts in each pstate while the CPU burn consumption
52 are at 200 Watts, 170 Watts, and 150 Watts respectively. If only one core is active, this machine consumes 120 / 115 / 110 watts.
54 To change the pstate of a given CPU, use the following functions:
55 #MSG_host_get_nb_pstates(), simgrid#s4u#Host#setPstate(), #MSG_host_get_power_peak_at().
57 To simulate the energy-related elements, first call the simgrid#energy#sg_energy_plugin_init() before your #MSG_init(),
58 and then use the following function to retrieve the consumption of a given host: MSG_host_get_consumed_energy().
61 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf, "Logging specific to the SURF energy plugin");
72 PowerRange(double idle, double min, double max) : idle(idle), min(min), max(max) {}
77 static simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> EXTENSION_ID;
79 explicit HostEnergy(simgrid::s4u::Host* ptr);
82 double getCurrentWattsValue(double cpu_load);
83 double getConsumedEnergy();
84 double getWattMinAt(int pstate);
85 double getWattMaxAt(int pstate);
89 void initWattsRangeList();
90 simgrid::s4u::Host* host = nullptr;
91 std::vector<PowerRange>
92 power_range_watts_list; /*< List of (min_power,max_power) pairs corresponding to each cpu pstate */
94 /* We need to keep track of what pstate has been used, as we will sometimes
95 * be notified only *after* a pstate has been used (but we need to update the energy consumption
96 * with the old pstate!)
101 double watts_off = 0.0; /*< Consumption when the machine is turned off (shutdown) */
102 double total_energy = 0.0; /*< Total energy consumed by the host */
103 double last_updated; /*< Timestamp of the last energy update event*/
106 simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> HostEnergy::EXTENSION_ID;
108 /* Computes the consumption so far. Called lazily on need. */
109 void HostEnergy::update()
111 double start_time = this->last_updated;
112 double finish_time = surf_get_clock();
114 double current_speed = host->speed();
115 if (current_speed <= 0)
116 // Some users declare a pstate of speed 0 flops (e.g., to model boot time).
117 // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
120 cpu_load = lmm_constraint_get_usage(host->pimpl_cpu->constraint()) / current_speed;
122 /** Divide by the number of cores here **/
123 cpu_load /= host->pimpl_cpu->coreCount();
125 if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not more
128 /* The problem with this model is that the load is always 0 or 1, never something less.
129 * Another possibility could be to model the total energy as
131 * X/(X+Y)*W_idle + Y/(X+Y)*W_burn
133 * where X is the amount of idling cores, and Y the amount of computing cores.
136 double previous_energy = this->total_energy;
138 double instantaneous_consumption;
140 instantaneous_consumption = this->watts_off;
142 instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
144 double energy_this_step = instantaneous_consumption * (finish_time - start_time);
146 //TODO Trace: Trace energy_this_step from start_time to finish_time in host->name()
148 this->total_energy = previous_energy + energy_this_step;
149 this->last_updated = finish_time;
150 this->pstate = host->pstate();
152 "[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
153 host->cname(), start_time, finish_time, host->pimpl_cpu->speed_.peak, previous_energy, energy_this_step);
156 HostEnergy::HostEnergy(simgrid::s4u::Host* ptr) : host(ptr), last_updated(surf_get_clock())
158 initWattsRangeList();
160 const char* off_power_str = host->property("watt_off");
161 if (off_power_str != nullptr) {
162 char* msg = bprintf("Invalid value for property watt_off of host %s: %%s", host->cname());
163 this->watts_off = xbt_str_parse_double(off_power_str, msg);
166 /* watts_off is 0 by default */
169 HostEnergy::~HostEnergy() = default;
171 double HostEnergy::getWattMinAt(int pstate)
173 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
174 return power_range_watts_list[pstate].min;
177 double HostEnergy::getWattMaxAt(int pstate)
179 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
180 return power_range_watts_list[pstate].max;
183 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
184 double HostEnergy::getCurrentWattsValue(double cpu_load)
186 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
188 /* min_power corresponds to the power consumed when only one core is active */
189 /* max_power is the power consumed at 100% cpu load */
190 auto range = power_range_watts_list.at(this->pstate);
191 double current_power = 0;
192 double min_power = 0;
193 double max_power = 0;
194 double power_slope = 0;
196 if (cpu_load > 0) { /* Something is going on, the machine is not idle */
197 double min_power = range.min;
198 double max_power = range.max;
201 * The min_power states how much we consume when only one single
202 * core is working. This means that when cpu_load == 1/coreCount, then
203 * current_power == min_power.
205 * The maximum must be reached when all cores are working (but 1 core was
206 * already accounted for by min_power)
207 * i.e., we need min_power + (maxCpuLoad-1/coreCount)*power_slope == max_power
208 * (maxCpuLoad is by definition 1)
211 int coreCount = host->coreCount();
212 double coreReciprocal = static_cast<double>(1) / static_cast<double>(coreCount);
214 power_slope = (max_power - min_power) / (1 - coreReciprocal);
216 power_slope = 0; // Should be 0, since max_power == min_power (in this case)
218 current_power = min_power + (cpu_load - coreReciprocal) * power_slope;
219 } else { /* Our machine is idle, take the dedicated value! */
220 current_power = range.idle;
223 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
224 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
226 return current_power;
229 double HostEnergy::getConsumedEnergy()
231 if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
232 simgrid::simix::kernelImmediate(std::bind(&HostEnergy::update, this));
237 void HostEnergy::initWattsRangeList()
239 const char* all_power_values_str = host->property("watt_per_state");
240 if (all_power_values_str == nullptr)
243 std::vector<std::string> all_power_values;
244 boost::split(all_power_values, all_power_values_str, boost::is_any_of(","));
247 for (auto current_power_values_str : all_power_values) {
248 /* retrieve the power values associated with the current pstate */
249 std::vector<std::string> current_power_values;
250 boost::split(current_power_values, current_power_values_str, boost::is_any_of(":"));
251 xbt_assert(current_power_values.size() == 3, "Power properties incorrectly defined - "
252 "could not retrieve idle, min and max power values for host %s",
255 /* min_power corresponds to the idle power (cpu load = 0) */
256 /* max_power is the power consumed at 100% cpu load */
257 char* msg_idle = bprintf("Invalid idle value for pstate %d on host %s: %%s", i, host->cname());
258 char* msg_min = bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->cname());
259 char* msg_max = bprintf("Invalid max value for pstate %d on host %s: %%s", i, host->cname());
260 PowerRange range(xbt_str_parse_double((current_power_values.at(0)).c_str(), msg_idle),
261 xbt_str_parse_double((current_power_values.at(1)).c_str(), msg_min),
262 xbt_str_parse_double((current_power_values.at(2)).c_str(), msg_max));
263 power_range_watts_list.push_back(range);
273 using simgrid::energy::HostEnergy;
275 /* **************************** events callback *************************** */
276 static void onCreation(simgrid::s4u::Host& host)
278 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
281 //TODO Trace: set to zero the energy variable associated to host->name()
283 host.extension_set(new HostEnergy(&host));
286 static void onActionStateChange(simgrid::surf::CpuAction* action, simgrid::surf::Action::State previous)
288 for (simgrid::surf::Cpu* cpu : action->cpus()) {
289 simgrid::s4u::Host* host = cpu->getHost();
290 if (host != nullptr) {
292 // If it's a VM, take the corresponding PM
293 simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
294 if (vm) // If it's a VM, take the corresponding PM
295 host = vm->pimpl_vm_->getPm();
297 // Get the host_energy extension for the relevant host
298 HostEnergy* host_energy = host->extension<HostEnergy>();
300 if (host_energy->last_updated < surf_get_clock())
301 host_energy->update();
306 /* This callback is fired either when the host changes its state (on/off) ("onStateChange") or its speed
307 * (because the user changed the pstate, or because of external trace events) ("onSpeedChange") */
308 static void onHostChange(simgrid::s4u::Host& host)
310 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
313 HostEnergy* host_energy = host.extension<HostEnergy>();
315 host_energy->update();
318 static void onHostDestruction(simgrid::s4u::Host& host)
320 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
323 HostEnergy* host_energy = host.extension<HostEnergy>();
324 host_energy->update();
325 XBT_INFO("Energy consumption of host %s: %f Joules", host.cname(), host_energy->getConsumedEnergy());
328 static void onSimulationEnd()
330 sg_host_t* host_list = sg_host_list();
331 int host_count = sg_host_count();
332 double total_energy = 0.0; // Total energy consumption (whole platform)
333 double used_hosts_energy = 0.0; // Energy consumed by hosts that computed something
334 for (int i = 0; i < host_count; i++) {
335 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(host_list[i]) == nullptr) { // Ignore virtual machines
337 bool host_was_used = (host_list[i]->extension<HostEnergy>()->last_updated != 0);
338 double energy = host_list[i]->extension<HostEnergy>()->getConsumedEnergy();
339 total_energy += energy;
341 used_hosts_energy += energy;
344 XBT_INFO("Total energy consumption: %f Joules (used hosts: %f Joules; unused/idle hosts: %f)",
345 total_energy, used_hosts_energy, total_energy - used_hosts_energy);
349 /* **************************** Public interface *************************** */
352 /** \ingroup SURF_plugin_energy
353 * \brief Enable host energy plugin
354 * \details Enable energy plugin to get joules consumption of each cpu. Call this function before #MSG_init().
356 void sg_host_energy_plugin_init()
358 if (HostEnergy::EXTENSION_ID.valid())
361 HostEnergy::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostEnergy>();
363 simgrid::s4u::Host::onCreation.connect(&onCreation);
364 simgrid::s4u::Host::onStateChange.connect(&onHostChange);
365 simgrid::s4u::Host::onSpeedChange.connect(&onHostChange);
366 simgrid::s4u::Host::onDestruction.connect(&onHostDestruction);
367 simgrid::s4u::onSimulationEnd.connect(&onSimulationEnd);
368 simgrid::surf::CpuAction::onStateChange.connect(&onActionStateChange);
371 /** @brief Returns the total energy consumed by the host so far (in Joules)
373 * See also @ref SURF_plugin_energy.
375 double sg_host_get_consumed_energy(sg_host_t host)
377 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
378 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
379 return host->extension<HostEnergy>()->getConsumedEnergy();
382 /** @brief Get the amount of watt dissipated at the given pstate when the host is idling */
383 double sg_host_get_wattmin_at(sg_host_t host, int pstate)
385 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
386 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
387 return host->extension<HostEnergy>()->getWattMinAt(pstate);
389 /** @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100% */
390 double sg_host_get_wattmax_at(sg_host_t host, int pstate)
392 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
393 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
394 return host->extension<HostEnergy>()->getWattMaxAt(pstate);