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/surf/plugins/energy.hpp"
9 #include "src/surf/cpu_interface.hpp"
10 #include "src/surf/virtual_machine.hpp"
14 /** @addtogroup SURF_plugin_energy
17 This is the energy plugin, enabling to account not only for computation time,
18 but also for the dissipated energy in the simulated platform.
20 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as follows:
23 <host id="HostA" power="100.0Mf" >
24 <prop id="watt_per_state" value="100.0:200.0" />
25 <prop id="watt_off" value="10" />
29 The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
30 If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
31 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these
32 values are arbitrary).
34 If your CPU is using pstates, then you can provide one consumption interval per pstate.
37 <host id="HostB" power="100.0Mf,50.0Mf,20.0Mf" pstate="0" >
38 <prop id="watt_per_state" value="95.0:200.0, 93.0:170.0, 90.0:150.0" />
39 <prop id="watt_off" value="10" />
43 That host has 3 levels of performance with the following performance: 100 Mflop/s, 50 Mflop/s or 20 Mflop/s.
44 It starts at pstate 0 (ie, at 100 Mflop/s). In this case, you have to specify one interval per pstate in the
45 watt_per_state property.
46 In this example, the idle consumption is 95 Watts, 93 Watts and 90 Watts in each pstate while the CPU burn consumption
47 are at 200 Watts, 170 Watts, and 150 Watts respectively.
49 To change the pstate of a given CPU, use the following functions:
50 #MSG_host_get_nb_pstates(), simgrid#s4u#Host#setPstate(), #MSG_host_get_power_peak_at().
52 To simulate the energy-related elements, first call the simgrid#energy#sg_energy_plugin_init() before your #MSG_init(),
53 and then use the following function to retrieve the consumption of a given host: MSG_host_get_consumed_energy().
56 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf, "Logging specific to the SURF energy plugin");
58 using simgrid::energy::HostEnergy;
63 simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> HostEnergy::EXTENSION_ID;
65 /* Computes the consumption so far. Called lazily on need. */
66 void HostEnergy::update()
68 simgrid::surf::HostImpl* surf_host = host->extension<simgrid::surf::HostImpl>();
69 double start_time = this->last_updated;
70 double finish_time = surf_get_clock();
72 if (surf_host->cpu_->getPstateSpeedCurrent() <= 0)
73 // Some users declare a pstate of speed 0 flops (e.g., to model boot time).
74 // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
77 cpu_load = lmm_constraint_get_usage(surf_host->cpu_->getConstraint()) / surf_host->cpu_->getPstateSpeedCurrent();
79 /** Divide by the number of cores here **/
80 cpu_load /= surf_host->cpu_->coreCount();
82 if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not more
85 /* The problem with this model is that the load is always 0 or 1, never something less.
86 * Another possibility could be to model the total energy as
88 * X/(X+Y)*W_idle + Y/(X+Y)*W_burn
90 * where X is the amount of ideling cores, and Y the amount of computing cores.
93 double previous_energy = this->total_energy;
95 double instantaneous_consumption;
97 instantaneous_consumption = this->watts_off;
99 instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
101 double energy_this_step = instantaneous_consumption*(finish_time-start_time);
103 this->total_energy = previous_energy + energy_this_step;
104 this->last_updated = finish_time;
106 XBT_DEBUG("[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
107 surf_host->getName(), start_time, finish_time, surf_host->cpu_->speed_.peak, previous_energy, energy_this_step);
110 HostEnergy::HostEnergy(simgrid::s4u::Host *ptr) : host(ptr), last_updated(surf_get_clock())
112 initWattsRangeList();
114 if (host->properties() != nullptr) {
115 char* off_power_str = (char*)xbt_dict_get_or_null(host->properties(), "watt_off");
116 if (off_power_str != nullptr) {
117 char *msg = bprintf("Invalid value for property watt_off of host %s: %%s",host->name().c_str());
118 watts_off = xbt_str_parse_double(off_power_str, msg);
126 HostEnergy::~HostEnergy()=default;
128 double HostEnergy::getWattMinAt(int pstate)
130 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->name().c_str());
131 return power_range_watts_list[pstate].min;
134 double HostEnergy::getWattMaxAt(int pstate)
136 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->name().c_str());
137 return power_range_watts_list[pstate].max;
140 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
141 double HostEnergy::getCurrentWattsValue(double cpu_load)
143 xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->name().c_str());
145 /* min_power corresponds to the idle power (cpu load = 0) */
146 /* max_power is the power consumed at 100% cpu load */
147 auto range = power_range_watts_list.at(host->pstate());
148 double current_power = 0;
149 double min_power = 0;
150 double max_power = 0;
151 double power_slope = 0;
153 if (cpu_load > 0) { /* Something is going on, the machine is not idle */
154 double min_power = range.min;
155 double max_power = range.max;
158 * The min_power states how much we consume when only one single
159 * core is working. This means that when cpu_load == 1/coreCount, then
160 * current_power == min_power.
162 * The maximum must be reached when all cores are working (but 1 core was
163 * already accounted for by min_power)
164 * i.e., we need min_power + (maxCpuLoad-1/coreCount)*power_slope == max_power
165 * (maxCpuLoad is by definition 1)
168 int coreCount = host->coreCount();
169 double coreReciprocal = static_cast<double>(1) / static_cast<double>(coreCount);
171 power_slope = (max_power - min_power) / (1 - coreReciprocal);
173 power_slope = 0; // Should be 0, since max_power == min_power (in this case)
175 current_power = min_power + (cpu_load - coreReciprocal) * power_slope;
177 else { /* Our machine is idle, take the dedicated value! */
178 current_power = range.idle;
181 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
182 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
184 return current_power;
187 double HostEnergy::getConsumedEnergy()
189 if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
190 simgrid::simix::kernelImmediate(std::bind(&HostEnergy::update, this));
195 void HostEnergy::initWattsRangeList()
197 if (host->properties() == nullptr)
199 char* all_power_values_str = static_cast<char*>(xbt_dict_get_or_null(host->properties(), "watt_per_state"));
200 if (all_power_values_str == nullptr)
203 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
204 int pstate_nb = xbt_dynar_length(all_power_values);
206 for (int i=0; i< pstate_nb; i++) {
207 /* retrieve the power values associated with the current pstate */
208 xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
209 xbt_assert(xbt_dynar_length(current_power_values) > 1,
210 "Power properties incorrectly defined - could not retrieve min and max power values for host %s",
211 host->name().c_str());
213 /* min_power corresponds to the idle power (cpu load = 0) */
214 /* max_power is the power consumed at 100% cpu load */
215 char *msg_idle = bprintf("Invalid idle value for pstate %d on host %s: %%s", i, host->name().c_str());
216 char *msg_min = bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->name().c_str());
217 char *msg_max = bprintf("Invalid max value for pstate %d on host %s: %%s", i, host->name().c_str());
219 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 0, char*), msg_idle),
220 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 1, char*), msg_min),
221 xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 2, char*), msg_max)
223 power_range_watts_list.push_back(range);
227 xbt_dynar_free(¤t_power_values);
229 xbt_dynar_free(&all_power_values);
235 /* **************************** events callback *************************** */
236 static void onCreation(simgrid::s4u::Host& host) {
237 simgrid::surf::HostImpl* surf_host = host.extension<simgrid::surf::HostImpl>();
238 if (dynamic_cast<simgrid::surf::VirtualMachine*>(surf_host)) // Ignore virtual machines
240 host.extension_set(new HostEnergy(&host));
243 static void onActionStateChange(simgrid::surf::CpuAction *action, simgrid::surf::Action::State previous) {
244 for(simgrid::surf::Cpu* cpu : action->cpus()) {
245 const char *name = cpu->getName();
246 sg_host_t sghost = sg_host_by_name(name);
247 if(sghost == nullptr)
249 simgrid::surf::HostImpl *host = sghost->extension<simgrid::surf::HostImpl>();
250 simgrid::surf::VirtualMachine *vm = dynamic_cast<simgrid::surf::VirtualMachine*>(host);
251 if (vm) // If it's a VM, take the corresponding PM
252 host = vm->getPm()->extension<simgrid::surf::HostImpl>();
254 HostEnergy *host_energy = host->piface_->extension<HostEnergy>();
256 if(host_energy->last_updated < surf_get_clock())
257 host_energy->update();
261 static void onHostStateChange(simgrid::s4u::Host &host) {
262 simgrid::surf::HostImpl* surf_host = host.extension<simgrid::surf::HostImpl>();
263 if (dynamic_cast<simgrid::surf::VirtualMachine*>(surf_host)) // Ignore virtual machines
266 HostEnergy *host_energy = host.extension<HostEnergy>();
268 if(host_energy->last_updated < surf_get_clock())
269 host_energy->update();
272 static void onHostDestruction(simgrid::s4u::Host& host) {
273 // Ignore virtual machines
274 simgrid::surf::HostImpl* surf_host = host.extension<simgrid::surf::HostImpl>();
275 if (dynamic_cast<simgrid::surf::VirtualMachine*>(surf_host))
277 HostEnergy *host_energy = host.extension<HostEnergy>();
278 host_energy->update();
279 XBT_INFO("Total energy of host %s: %f Joules", host.name().c_str(), host_energy->getConsumedEnergy());
282 /* **************************** Public interface *************************** */
283 /** \ingroup SURF_plugin_energy
284 * \brief Enable energy plugin
285 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
287 void sg_energy_plugin_init()
289 if (HostEnergy::EXTENSION_ID.valid())
292 HostEnergy::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostEnergy>();
294 simgrid::s4u::Host::onCreation.connect(&onCreation);
295 simgrid::s4u::Host::onStateChange.connect(&onHostStateChange);
296 simgrid::s4u::Host::onDestruction.connect(&onHostDestruction);
297 simgrid::surf::CpuAction::onStateChange.connect(&onActionStateChange);
300 /** @brief Returns the total energy consumed by the host so far (in Joules)
302 * See also @ref SURF_plugin_energy.
304 double sg_host_get_consumed_energy(sg_host_t host) {
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>()->getConsumedEnergy();
310 /** @brief Get the amount of watt dissipated at the given pstate when the host is idling */
311 double sg_host_get_wattmin_at(sg_host_t host, int pstate) {
312 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
313 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
314 return host->extension<HostEnergy>()->getWattMinAt(pstate);
316 /** @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100% */
317 double sg_host_get_wattmax_at(sg_host_t host, int pstate) {
318 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
319 "The Energy plugin is not active. Please call sg_energy_plugin_init() during initialization.");
320 return host->extension<HostEnergy>()->getWattMaxAt(pstate);