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"
12 /** @addtogroup SURF_plugin_energy
15 This is the energy plugin, enabling to account not only for computation time,
16 but also for the dissipated energy in the simulated platform.
18 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as
22 <host id="HostA" power="100.0Mf" >
23 <prop id="watt_per_state" value="100.0:200.0" />
24 <prop id="watt_off" value="10" />
28 The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
29 If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
30 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these
31 values are arbitrary).
33 If your CPU is using pstates, then you can provide one consumption interval per pstate.
36 <host id="HostB" power="100.0Mf,50.0Mf,20.0Mf" pstate="0" >
37 <prop id="watt_per_state" value="95.0:200.0, 93.0:170.0, 90.0:150.0" />
38 <prop id="watt_off" value="10" />
42 That host has 3 levels of performance with the following performance: 100 Mflop/s, 50 Mflop/s or 20 Mflop/s.
43 It starts at pstate 0 (ie, at 100 Mflop/s). In this case, you have to specify one interval per pstate in the
44 watt_per_state property.
45 In this example, the idle consumption is 95 Watts, 93 Watts and 90 Watts in each pstate while the CPU burn consumption
46 are at 200 Watts, 170 Watts, and 150 Watts respectively.
48 To change the pstate of a given CPU, use the following functions:
49 #MSG_host_get_nb_pstates(), simgrid#s4u#Host#setPstate(), #MSG_host_get_power_peak_at().
51 To simulate the energy-related elements, first call the simgrid#energy#sg_energy_plugin_init() before your #MSG_init(),
52 and then use the following function to retrieve the consumption of a given host: MSG_host_get_consumed_energy().
55 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf, "Logging specific to the SURF energy plugin");
60 class XBT_PRIVATE HostEnergy;
68 PowerRange(double idle, double min, double max) : idle(idle), min(min), max(max) {}
73 static simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> EXTENSION_ID;
75 explicit HostEnergy(simgrid::s4u::Host* ptr);
78 double getCurrentWattsValue(double cpu_load);
79 double getConsumedEnergy();
80 double getWattMinAt(int pstate);
81 double getWattMaxAt(int pstate);
85 void initWattsRangeList();
86 simgrid::s4u::Host* host = nullptr;
87 std::vector<PowerRange>
88 power_range_watts_list; /*< List of (min_power,max_power) pairs corresponding to each cpu pstate */
90 double watts_off = 0.0; /*< Consumption when the machine is turned off (shutdown) */
91 double total_energy = 0.0; /*< Total energy consumed by the host */
92 double last_updated; /*< Timestamp of the last energy update event*/
95 simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> HostEnergy::EXTENSION_ID;
97 /* Computes the consumption so far. Called lazily on need. */
98 void HostEnergy::update()
100 double start_time = this->last_updated;
101 double finish_time = surf_get_clock();
103 if (host->pimpl_cpu->getPstateSpeedCurrent() <= 0)
104 // Some users declare a pstate of speed 0 flops (e.g., to model boot time).
105 // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
108 cpu_load = lmm_constraint_get_usage(host->pimpl_cpu->constraint()) / host->pimpl_cpu->getPstateSpeedCurrent();
110 /** Divide by the number of cores here **/
111 cpu_load /= host->pimpl_cpu->coreCount();
113 if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not more
116 /* The problem with this model is that the load is always 0 or 1, never something less.
117 * Another possibility could be to model the total energy as
119 * X/(X+Y)*W_idle + Y/(X+Y)*W_burn
121 * where X is the amount of idling cores, and Y the amount of computing cores.
124 double previous_energy = this->total_energy;
126 double instantaneous_consumption;
128 instantaneous_consumption = this->watts_off;
130 instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
132 double energy_this_step = instantaneous_consumption * (finish_time - start_time);
134 this->total_energy = previous_energy + energy_this_step;
135 this->last_updated = finish_time;
138 "[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
139 host->cname(), start_time, finish_time, host->pimpl_cpu->speed_.peak, previous_energy, energy_this_step);
142 HostEnergy::HostEnergy(simgrid::s4u::Host* ptr) : host(ptr), last_updated(surf_get_clock())
144 initWattsRangeList();
146 const char* off_power_str = host->property("watt_off");
147 if (off_power_str != nullptr) {
148 char* msg = bprintf("Invalid value for property watt_off of host %s: %%s", host->cname());
149 this->watts_off = xbt_str_parse_double(off_power_str, msg);
152 /* watts_off is 0 by default */
155 HostEnergy::~HostEnergy() = default;
157 double HostEnergy::getWattMinAt(int pstate)
159 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
160 return power_range_watts_list[pstate].min;
163 double HostEnergy::getWattMaxAt(int pstate)
165 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
166 return power_range_watts_list[pstate].max;
169 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
170 double HostEnergy::getCurrentWattsValue(double cpu_load)
172 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
174 /* min_power corresponds to the idle power (cpu load = 0) */
175 /* max_power is the power consumed at 100% cpu load */
176 auto range = power_range_watts_list.at(host->pstate());
177 double current_power = 0;
178 double min_power = 0;
179 double max_power = 0;
180 double power_slope = 0;
182 if (cpu_load > 0) { /* Something is going on, the machine is not idle */
183 double min_power = range.min;
184 double max_power = range.max;
187 * The min_power states how much we consume when only one single
188 * core is working. This means that when cpu_load == 1/coreCount, then
189 * current_power == min_power.
191 * The maximum must be reached when all cores are working (but 1 core was
192 * already accounted for by min_power)
193 * i.e., we need min_power + (maxCpuLoad-1/coreCount)*power_slope == max_power
194 * (maxCpuLoad is by definition 1)
197 int coreCount = host->coreCount();
198 double coreReciprocal = static_cast<double>(1) / static_cast<double>(coreCount);
200 power_slope = (max_power - min_power) / (1 - coreReciprocal);
202 power_slope = 0; // Should be 0, since max_power == min_power (in this case)
204 current_power = min_power + (cpu_load - coreReciprocal) * power_slope;
205 } else { /* Our machine is idle, take the dedicated value! */
206 current_power = range.idle;
209 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
210 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
212 return current_power;
215 double HostEnergy::getConsumedEnergy()
217 if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
218 simgrid::simix::kernelImmediate(std::bind(&HostEnergy::update, this));
223 void HostEnergy::initWattsRangeList()
225 const char* all_power_values_str = host->property("watt_per_state");
226 if (all_power_values_str == nullptr)
229 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
230 int pstate_nb = xbt_dynar_length(all_power_values);
232 for (int i = 0; i < pstate_nb; i++) {
233 /* retrieve the power values associated with the current pstate */
234 xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
235 xbt_assert(xbt_dynar_length(current_power_values) == 3,
236 "Power properties incorrectly defined - could not retrieve idle, min and max power values for host %s",
239 /* min_power corresponds to the idle power (cpu load = 0) */
240 /* max_power is the power consumed at 100% cpu load */
241 char* msg_idle = bprintf("Invalid idle value for pstate %d on host %s: %%s", i, host->cname());
242 char* msg_min = bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->cname());
243 char* msg_max = bprintf("Invalid max value for pstate %d on host %s: %%s", i, host->cname());
244 PowerRange range(xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 0, char*), msg_idle),
245 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 1, char*), msg_min),
246 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 2, char*), msg_max));
247 power_range_watts_list.push_back(range);
252 xbt_dynar_free(¤t_power_values);
254 xbt_dynar_free(&all_power_values);
259 using simgrid::energy::HostEnergy;
261 /* **************************** events callback *************************** */
262 static void onCreation(simgrid::s4u::Host& host)
264 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
266 host.extension_set(new HostEnergy(&host));
269 static void onActionStateChange(simgrid::surf::CpuAction* action, simgrid::surf::Action::State previous)
271 for (simgrid::surf::Cpu* cpu : action->cpus()) {
272 simgrid::s4u::Host* host = cpu->getHost();
276 // If it's a VM, take the corresponding PM
277 simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
278 if (vm) // If it's a VM, take the corresponding PM
279 host = vm->pimpl_vm_->getPm();
281 // Get the host_energy extension for the relevant host
282 HostEnergy* host_energy = host->extension<HostEnergy>();
284 if (host_energy->last_updated < surf_get_clock())
285 host_energy->update();
289 static void onHostStateChange(simgrid::s4u::Host& host)
291 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
294 HostEnergy* host_energy = host.extension<HostEnergy>();
296 if (host_energy->last_updated < surf_get_clock())
297 host_energy->update();
300 static void onHostDestruction(simgrid::s4u::Host& host)
302 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
305 HostEnergy* host_energy = host.extension<HostEnergy>();
306 host_energy->update();
307 XBT_INFO("Total energy of host %s: %f Joules", host.cname(), host_energy->getConsumedEnergy());
310 /* **************************** Public interface *************************** */
311 /** \ingroup SURF_plugin_energy
312 * \brief Enable energy plugin
313 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before
316 void sg_host_energy_plugin_init()
318 if (HostEnergy::EXTENSION_ID.valid())
321 HostEnergy::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostEnergy>();
323 simgrid::s4u::Host::onCreation.connect(&onCreation);
324 simgrid::s4u::Host::onStateChange.connect(&onHostStateChange);
325 simgrid::s4u::Host::onDestruction.connect(&onHostDestruction);
326 simgrid::surf::CpuAction::onStateChange.connect(&onActionStateChange);
329 /** @brief Returns the total energy consumed by the host so far (in Joules)
331 * See also @ref SURF_plugin_energy.
333 double sg_host_get_consumed_energy(sg_host_t host)
335 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
336 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
337 return host->extension<HostEnergy>()->getConsumedEnergy();
340 /** @brief Get the amount of watt dissipated at the given pstate when the host is idling */
341 double sg_host_get_wattmin_at(sg_host_t host, int pstate)
343 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
344 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
345 return host->extension<HostEnergy>()->getWattMinAt(pstate);
347 /** @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100% */
348 double sg_host_get_wattmax_at(sg_host_t host, int pstate)
350 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
351 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
352 return host->extension<HostEnergy>()->getWattMaxAt(pstate);