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"
10 #include "src/surf/plugins/energy.hpp"
13 /** @addtogroup SURF_plugin_energy
16 This is the energy plugin, enabling to account not only for computation time,
17 but also for the dissipated energy in the simulated platform.
19 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as follows:
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");
57 using simgrid::energy::HostEnergy;
62 simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> HostEnergy::EXTENSION_ID;
64 /* Computes the consumption so far. Called lazily on need. */
65 void HostEnergy::update()
67 double start_time = this->last_updated;
68 double finish_time = surf_get_clock();
70 if (host->pimpl_cpu->getPstateSpeedCurrent() <= 0)
71 // Some users declare a pstate of speed 0 flops (e.g., to model boot time).
72 // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
75 cpu_load = lmm_constraint_get_usage(host->pimpl_cpu->constraint()) / host->pimpl_cpu->getPstateSpeedCurrent();
77 /** Divide by the number of cores here **/
78 cpu_load /= host->pimpl_cpu->coreCount();
80 if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not more
83 /* The problem with this model is that the load is always 0 or 1, never something less.
84 * Another possibility could be to model the total energy as
86 * X/(X+Y)*W_idle + Y/(X+Y)*W_burn
88 * where X is the amount of idling cores, and Y the amount of computing cores.
91 double previous_energy = this->total_energy;
93 double instantaneous_consumption;
95 instantaneous_consumption = this->watts_off;
97 instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
99 double energy_this_step = instantaneous_consumption*(finish_time-start_time);
101 this->total_energy = previous_energy + energy_this_step;
102 this->last_updated = finish_time;
105 "[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
106 host->cname(), start_time, finish_time, host->pimpl_cpu->speed_.peak, previous_energy, energy_this_step);
109 HostEnergy::HostEnergy(simgrid::s4u::Host *ptr) : host(ptr), last_updated(surf_get_clock())
111 initWattsRangeList();
113 const char* off_power_str = host->property("watt_off");
114 if (off_power_str != nullptr) {
115 char* msg = bprintf("Invalid value for property watt_off of host %s: %%s", host->cname());
116 this->watts_off = xbt_str_parse_double(off_power_str, msg);
119 /* watts_off is 0 by default */
122 HostEnergy::~HostEnergy()=default;
124 double HostEnergy::getWattMinAt(int pstate)
126 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
127 return power_range_watts_list[pstate].min;
130 double HostEnergy::getWattMaxAt(int pstate)
132 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
133 return power_range_watts_list[pstate].max;
136 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
137 double HostEnergy::getCurrentWattsValue(double cpu_load)
139 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
141 /* min_power corresponds to the idle power (cpu load = 0) */
142 /* max_power is the power consumed at 100% cpu load */
143 auto range = power_range_watts_list.at(host->pstate());
144 double current_power = 0;
145 double min_power = 0;
146 double max_power = 0;
147 double power_slope = 0;
149 if (cpu_load > 0) { /* Something is going on, the machine is not idle */
150 double min_power = range.min;
151 double max_power = range.max;
154 * The min_power states how much we consume when only one single
155 * core is working. This means that when cpu_load == 1/coreCount, then
156 * current_power == min_power.
158 * The maximum must be reached when all cores are working (but 1 core was
159 * already accounted for by min_power)
160 * i.e., we need min_power + (maxCpuLoad-1/coreCount)*power_slope == max_power
161 * (maxCpuLoad is by definition 1)
164 int coreCount = host->coreCount();
165 double coreReciprocal = static_cast<double>(1) / static_cast<double>(coreCount);
167 power_slope = (max_power - min_power) / (1 - coreReciprocal);
169 power_slope = 0; // Should be 0, since max_power == min_power (in this case)
171 current_power = min_power + (cpu_load - coreReciprocal) * power_slope;
173 else { /* Our machine is idle, take the dedicated value! */
174 current_power = range.idle;
177 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
178 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
180 return current_power;
183 double HostEnergy::getConsumedEnergy()
185 if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
186 simgrid::simix::kernelImmediate(std::bind(&HostEnergy::update, this));
191 void HostEnergy::initWattsRangeList()
193 const char* all_power_values_str = host->property("watt_per_state");
194 if (all_power_values_str == nullptr)
197 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
198 int pstate_nb = xbt_dynar_length(all_power_values);
200 for (int i=0; i< pstate_nb; i++) {
201 /* retrieve the power values associated with the current pstate */
202 xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
203 xbt_assert(xbt_dynar_length(current_power_values) == 3,
204 "Power properties incorrectly defined - could not retrieve idle, min and max power values for host %s",
207 /* min_power corresponds to the idle power (cpu load = 0) */
208 /* max_power is the power consumed at 100% cpu load */
209 char* msg_idle = bprintf("Invalid idle value for pstate %d on host %s: %%s", i, host->cname());
210 char* msg_min = bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->cname());
211 char* msg_max = bprintf("Invalid max value for pstate %d on host %s: %%s", i, host->cname());
213 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 0, char*), msg_idle),
214 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 1, char*), msg_min),
215 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 2, char*), msg_max)
217 power_range_watts_list.push_back(range);
222 xbt_dynar_free(¤t_power_values);
224 xbt_dynar_free(&all_power_values);
230 /* **************************** events callback *************************** */
231 static void onCreation(simgrid::s4u::Host& host) {
232 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
234 host.extension_set(new HostEnergy(&host));
237 static void onActionStateChange(simgrid::surf::CpuAction *action, simgrid::surf::Action::State previous) {
238 for (simgrid::surf::Cpu* cpu : action->cpus()) {
239 simgrid::s4u::Host* host = cpu->getHost();
243 // If it's a VM, take the corresponding PM
244 simgrid::s4u::VirtualMachine* vm = dynamic_cast<simgrid::s4u::VirtualMachine*>(host);
245 if (vm) // If it's a VM, take the corresponding PM
246 host = vm->pimpl_vm_->getPm();
248 // Get the host_energy extension for the relevant host
249 HostEnergy* host_energy = host->extension<HostEnergy>();
251 if (host_energy->last_updated < surf_get_clock())
252 host_energy->update();
256 static void onHostStateChange(simgrid::s4u::Host &host) {
257 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
260 HostEnergy *host_energy = host.extension<HostEnergy>();
262 if(host_energy->last_updated < surf_get_clock())
263 host_energy->update();
266 static void onHostDestruction(simgrid::s4u::Host& host) {
267 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
270 HostEnergy *host_energy = host.extension<HostEnergy>();
271 host_energy->update();
272 XBT_INFO("Total energy of host %s: %f Joules", host.cname(), host_energy->getConsumedEnergy());
275 /* **************************** Public interface *************************** */
276 /** \ingroup SURF_plugin_energy
277 * \brief Enable energy plugin
278 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
280 void sg_energy_plugin_init()
282 if (HostEnergy::EXTENSION_ID.valid())
285 HostEnergy::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostEnergy>();
287 simgrid::s4u::Host::onCreation.connect(&onCreation);
288 simgrid::s4u::Host::onStateChange.connect(&onHostStateChange);
289 simgrid::s4u::Host::onDestruction.connect(&onHostDestruction);
290 simgrid::surf::CpuAction::onStateChange.connect(&onActionStateChange);
293 /** @brief Returns the total energy consumed by the host so far (in Joules)
295 * See also @ref SURF_plugin_energy.
297 double sg_host_get_consumed_energy(sg_host_t host) {
298 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
299 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
300 return host->extension<HostEnergy>()->getConsumedEnergy();
303 /** @brief Get the amount of watt dissipated at the given pstate when the host is idling */
304 double sg_host_get_wattmin_at(sg_host_t host, int pstate) {
305 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
306 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
307 return host->extension<HostEnergy>()->getWattMinAt(pstate);
309 /** @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100% */
310 double sg_host_get_wattmax_at(sg_host_t host, int pstate) {
311 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
312 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
313 return host->extension<HostEnergy>()->getWattMaxAt(pstate);