1 /* Copyright (c) 2010, 2012-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "simgrid/plugins/energy.h"
10 #include "simgrid/simix.hpp"
11 #include "src/surf/plugins/energy.hpp"
12 #include "src/surf/cpu_interface.hpp"
13 #include "src/surf/virtual_machine.hpp"
15 /** @addtogroup SURF_plugin_energy
18 This is the energy plugin, enabling to account not only for computation time,
19 but also for the dissipated energy in the simulated platform.
21 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as follows:
24 <host id="HostA" power="100.0Mf" >
25 <prop id="watt_per_state" value="100.0:200.0" />
26 <prop id="watt_off" value="10" />
30 The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
31 If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
32 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these
33 values are arbitrary).
35 If your CPU is using pstates, then you can provide one consumption interval per pstate.
38 <host id="HostB" power="100.0Mf,50.0Mf,20.0Mf" pstate="0" >
39 <prop id="watt_per_state" value="95.0:200.0, 93.0:170.0, 90.0:150.0" />
40 <prop id="watt_off" value="10" />
44 That host has 3 levels of performance with the following performance: 100 Mflop/s, 50 Mflop/s or 20 Mflop/s.
45 It starts at pstate 0 (ie, at 100 Mflop/s). In this case, you have to specify one interval per pstate in the
46 watt_per_state property.
47 In this example, the idle consumption is 95 Watts, 93 Watts and 90 Watts in each pstate while the CPU burn consumption
48 are at 200 Watts, 170 Watts, and 150 Watts respectively.
50 To change the pstate of a given CPU, use the following functions:
51 #MSG_host_get_nb_pstates(), simgrid#s4u#Host#setPstate(), #MSG_host_get_power_peak_at().
53 To simulate the energy-related elements, first call the simgrid#energy#sg_energy_plugin_init() before your #MSG_init(),
54 and then use the following function to retrieve the consumption of a given host: MSG_host_get_consumed_energy().
57 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf, "Logging specific to the SURF energy plugin");
59 using simgrid::energy::HostEnergy;
64 simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> HostEnergy::EXTENSION_ID;
66 /* Computes the consumption so far. Called lazily on need. */
67 void HostEnergy::update()
69 simgrid::surf::HostImpl* surf_host = host->extension<simgrid::surf::HostImpl>();
70 double start_time = this->last_updated;
71 double finish_time = surf_get_clock();
73 if (surf_host->cpu_->speed_.peak <= 0)
74 // Some users declare a pstate of speed 0 flops (e.g., to model boot time).
75 // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
78 cpu_load = lmm_constraint_get_usage(surf_host->cpu_->getConstraint()) / surf_host->cpu_->speed_.peak;
80 if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not more
82 /* The problem with this model is that the load is always 0 or 1, never something less.
83 * Another possibility could be to model the total energy as
85 * X/(X+Y)*W_idle + Y/(X+Y)*W_burn
87 * where X is the amount of ideling cores, and Y the amount of computing cores.
90 double previous_energy = this->total_energy;
92 double instantaneous_consumption;
94 instantaneous_consumption = this->watts_off;
96 instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
98 double energy_this_step = instantaneous_consumption*(finish_time-start_time);
100 this->total_energy = previous_energy + energy_this_step;
101 this->last_updated = finish_time;
103 XBT_DEBUG("[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
104 surf_host->getName(), start_time, finish_time, surf_host->cpu_->speed_.peak, previous_energy, energy_this_step);
107 HostEnergy::HostEnergy(simgrid::s4u::Host *ptr) : host(ptr), last_updated(surf_get_clock())
109 initWattsRangeList();
111 if (host->properties() != nullptr) {
112 char* off_power_str = (char*)xbt_dict_get_or_null(host->properties(), "watt_off");
113 if (off_power_str != nullptr) {
114 char *msg = bprintf("Invalid value for property watt_off of host %s: %%s",host->name().c_str());
115 watts_off = xbt_str_parse_double(off_power_str, msg);
123 HostEnergy::~HostEnergy()=default;
125 double HostEnergy::getWattMinAt(int pstate)
127 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->name().c_str());
128 return power_range_watts_list[pstate].first;
131 double HostEnergy::getWattMaxAt(int pstate)
133 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->name().c_str());
134 return power_range_watts_list[pstate].second;
137 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
138 double HostEnergy::getCurrentWattsValue(double cpu_load)
140 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->name().c_str());
142 /* min_power corresponds to the idle power (cpu load = 0) */
143 /* max_power is the power consumed at 100% cpu load */
144 auto range = power_range_watts_list.at(host->pstate());
145 double min_power = range.first;
146 double max_power = range.second;
147 double power_slope = max_power - min_power;
148 double current_power = min_power + cpu_load * power_slope;
150 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
151 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
153 return current_power;
156 double HostEnergy::getConsumedEnergy()
158 if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
159 simgrid::simix::kernelImmediate(std::bind(&HostEnergy::update, this));
164 void HostEnergy::initWattsRangeList()
166 if (host->properties() == nullptr)
168 char* all_power_values_str = static_cast<char*>(xbt_dict_get_or_null(host->properties(), "watt_per_state"));
169 if (all_power_values_str == nullptr)
172 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
173 int pstate_nb = xbt_dynar_length(all_power_values);
175 for (int i=0; i< pstate_nb; i++) {
176 /* retrieve the power values associated with the current pstate */
177 xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
178 xbt_assert(xbt_dynar_length(current_power_values) > 1,
179 "Power properties incorrectly defined - could not retrieve min and max power values for host %s",
180 host->name().c_str());
182 /* min_power corresponds to the idle power (cpu load = 0) */
183 /* max_power is the power consumed at 100% cpu load */
184 char *msg_min = bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->name().c_str());
185 char *msg_max = bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->name().c_str());
186 power_range_watts_list.push_back(power_range(
187 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 0, char*), msg_min),
188 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 1, char*), msg_max)
193 xbt_dynar_free(¤t_power_values);
195 xbt_dynar_free(&all_power_values);
201 /* **************************** events callback *************************** */
202 static void onCreation(simgrid::s4u::Host& host) {
203 simgrid::surf::HostImpl* surf_host = host.extension<simgrid::surf::HostImpl>();
204 if (dynamic_cast<simgrid::surf::VirtualMachine*>(surf_host)) // Ignore virtual machines
206 host.extension_set(new HostEnergy(&host));
209 static void onActionStateChange(simgrid::surf::CpuAction *action, simgrid::surf::Action::State previous) {
210 for(simgrid::surf::Cpu* cpu : action->cpus()) {
211 const char *name = cpu->getName();
212 sg_host_t sghost = sg_host_by_name(name);
213 if(sghost == nullptr)
215 simgrid::surf::HostImpl *host = sghost->extension<simgrid::surf::HostImpl>();
216 simgrid::surf::VirtualMachine *vm = dynamic_cast<simgrid::surf::VirtualMachine*>(host);
217 if (vm) // If it's a VM, take the corresponding PM
218 host = vm->getPm()->extension<simgrid::surf::HostImpl>();
220 HostEnergy *host_energy = host->piface_->extension<HostEnergy>();
222 if(host_energy->last_updated < surf_get_clock())
223 host_energy->update();
227 static void onHostStateChange(simgrid::s4u::Host &host) {
228 simgrid::surf::HostImpl* surf_host = host.extension<simgrid::surf::HostImpl>();
229 if (dynamic_cast<simgrid::surf::VirtualMachine*>(surf_host)) // Ignore virtual machines
232 HostEnergy *host_energy = host.extension<HostEnergy>();
234 if(host_energy->last_updated < surf_get_clock())
235 host_energy->update();
238 static void onHostDestruction(simgrid::s4u::Host& host) {
239 // Ignore virtual machines
240 simgrid::surf::HostImpl* surf_host = host.extension<simgrid::surf::HostImpl>();
241 if (dynamic_cast<simgrid::surf::VirtualMachine*>(surf_host))
243 HostEnergy *host_energy = host.extension<HostEnergy>();
244 host_energy->update();
245 XBT_INFO("Total energy of host %s: %f Joules", host.name().c_str(), host_energy->getConsumedEnergy());
248 /* **************************** Public interface *************************** */
249 /** \ingroup SURF_plugin_energy
250 * \brief Enable energy plugin
251 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
253 void sg_energy_plugin_init()
255 if (HostEnergy::EXTENSION_ID.valid())
258 HostEnergy::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostEnergy>();
260 simgrid::s4u::Host::onCreation.connect(&onCreation);
261 simgrid::s4u::Host::onStateChange.connect(&onHostStateChange);
262 simgrid::s4u::Host::onDestruction.connect(&onHostDestruction);
263 simgrid::surf::CpuAction::onStateChange.connect(&onActionStateChange);
266 /** @brief Returns the total energy consumed by the host so far (in Joules)
268 * See also @ref SURF_plugin_energy.
270 double sg_host_get_consumed_energy(sg_host_t host) {
271 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
272 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
273 return host->extension<HostEnergy>()->getConsumedEnergy();
276 /** @brief Get the amount of watt dissipated at the given pstate when the host is idling */
277 double sg_host_get_wattmin_at(sg_host_t host, int pstate) {
278 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
279 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
280 return host->extension<HostEnergy>()->getWattMinAt(pstate);
282 /** @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100% */
283 double sg_host_get_wattmax_at(sg_host_t host, int pstate) {
284 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
285 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
286 return host->extension<HostEnergy>()->getWattMaxAt(pstate);