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. */
10 #include <simgrid/plugins/energy.h>
11 #include <simgrid/simix.hpp>
12 #include <src/surf/plugins/energy.hpp>
13 #include <src/surf/cpu_interface.hpp>
14 #include <src/surf/virtual_machine.hpp>
16 /** @addtogroup SURF_plugin_energy
19 This is the energy plugin, enabling to account not only for computation time,
20 but also for the dissipated energy in the simulated platform.
22 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as follows:
25 <host id="HostA" power="100.0Mf" >
26 <prop id="watt_per_state" value="100.0:200.0" />
27 <prop id="watt_off" value="10" />
31 The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
32 If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
33 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these 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 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 are at 200 Watts,
47 170 Watts and 150 Watts respectively.
49 To change the pstate of a given CPU, use the following functions: #MSG_host_get_nb_pstates(), #MSG_host_set_pstate(), #MSG_host_get_power_peak_at().
51 To simulate the energy-related elements, first call the #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,
56 "Logging specific to the SURF energy plugin");
58 using simgrid::energy::HostEnergy;
63 simgrid::xbt::Extension<simgrid::Host, HostEnergy> HostEnergy::EXTENSION_ID;
65 /* Computes the consumption so far. Called lazily on need. */
66 void HostEnergy::update()
68 simgrid::surf::Host* surf_host = host->extension<simgrid::surf::Host>();
69 double start_time = this->last_updated;
70 double finish_time = surf_get_clock();
72 if (surf_host->p_cpu->m_speedPeak == 0)
73 // Some users declare a pstate of speed 0 flops (eg 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->p_cpu->getConstraint())
78 / surf_host->p_cpu->m_speedPeak;
80 if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not mores
83 double previous_energy = this->total_energy;
85 double instantaneous_consumption;
87 instantaneous_consumption = this->watts_off;
89 instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
91 double energy_this_step = instantaneous_consumption*(finish_time-start_time);
93 this->total_energy = previous_energy + energy_this_step;
94 this->last_updated = finish_time;
96 XBT_DEBUG("[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
97 surf_host->getName(), start_time, finish_time, surf_host->p_cpu->m_speedPeak, previous_energy, energy_this_step);
100 HostEnergy::HostEnergy(simgrid::Host *ptr) :
101 host(ptr), last_updated(surf_get_clock())
103 initWattsRangeList();
105 if (host->getProperties() != NULL) {
106 char* off_power_str = (char*)xbt_dict_get_or_null(host->getProperties(), "watt_off");
107 if (off_power_str != NULL)
108 watts_off = atof(off_power_str);
115 HostEnergy::~HostEnergy()
119 double HostEnergy::getWattMinAt(int pstate)
121 xbt_assert(!power_range_watts_list.empty(),
122 "No power range properties specified for host %s", host->getName().c_str());
123 return power_range_watts_list[pstate].first;
126 double HostEnergy::getWattMaxAt(int pstate)
128 xbt_assert(!power_range_watts_list.empty(),
129 "No power range properties specified for host %s", host->getName().c_str());
130 return power_range_watts_list[pstate].second;
133 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
134 double HostEnergy::getCurrentWattsValue(double cpu_load)
136 xbt_assert(!power_range_watts_list.empty(),
137 "No power range properties specified for host %s", host->getName().c_str());
139 /* min_power corresponds to the idle power (cpu load = 0) */
140 /* max_power is the power consumed at 100% cpu load */
141 auto range = power_range_watts_list.at(host->getPState());
142 double min_power = range.first;
143 double max_power = range.second;
144 double power_slope = max_power - min_power;
145 double current_power = min_power + cpu_load * power_slope;
147 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
148 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
150 return current_power;
153 double HostEnergy::getConsumedEnergy()
155 if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
156 simgrid::simix::kernel(std::bind(&HostEnergy::update, this));
161 void HostEnergy::initWattsRangeList()
163 if (host->getProperties() == NULL)
165 char* all_power_values_str =
166 (char*)xbt_dict_get_or_null(host->getProperties(), "watt_per_state");
167 if (all_power_values_str == NULL)
170 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
171 int pstate_nb = xbt_dynar_length(all_power_values);
173 for (int i=0; i< pstate_nb; i++)
175 /* retrieve the power values associated with the current pstate */
176 xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
177 xbt_assert(xbt_dynar_length(current_power_values) > 1,
178 "Power properties incorrectly defined - "
179 "could not retrieve min and max power values for host %s",
180 host->getName().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 power_range_watts_list.push_back(power_range(
185 atof(xbt_dynar_get_as(current_power_values, 0, char*)),
186 atof(xbt_dynar_get_as(current_power_values, 1, char*))
189 xbt_dynar_free(&all_power_values);
195 /* **************************** events callback *************************** */
196 static void onCreation(simgrid::surf::Host *host) {
197 if (dynamic_cast<simgrid::surf::VirtualMachine*>(host)) // Ignore virtual machines
199 host->p_host->extension_set(new HostEnergy(host->p_host));
202 static void onActionStateChange(simgrid::surf::CpuAction *action,
203 e_surf_action_state_t old, e_surf_action_state_t cur) {
204 const char *name = getActionCpu(action)->getName();
205 simgrid::surf::Host *host = sg_host_by_name(name)->extension<simgrid::surf::Host>();
206 simgrid::surf::VirtualMachine *vm = dynamic_cast<simgrid::surf::VirtualMachine*>(host);
207 if (vm) // If it's a VM, take the corresponding PM
208 host = vm->getPm()->extension<simgrid::surf::Host>();
210 HostEnergy *host_energy = host->p_host->extension<HostEnergy>();
212 if(host_energy->last_updated < surf_get_clock())
213 host_energy->update();
216 static void onHostStateChange(simgrid::surf::Host *host) {
217 if (dynamic_cast<simgrid::surf::VirtualMachine*>(host)) // Ignore virtual machines
220 HostEnergy *host_energy = host->p_host->extension<HostEnergy>();
222 if(host_energy->last_updated < surf_get_clock())
223 host_energy->update();
226 static void onHostDestruction(simgrid::surf::Host *host) {
227 // Ignore virtual machines
228 if (dynamic_cast<simgrid::surf::VirtualMachine*>(host))
230 HostEnergy *host_energy = host->p_host->extension<HostEnergy>();
231 host_energy->update();
232 XBT_INFO("Total energy of host %s: %f Joules", host->getName(), host_energy->getConsumedEnergy());
235 /* **************************** Public interface *************************** */
236 /** \ingroup SURF_plugin_energy
237 * \brief Enable energy plugin
238 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
240 void sg_energy_plugin_init(void)
242 if (HostEnergy::EXTENSION_ID.valid())
245 HostEnergy::EXTENSION_ID = simgrid::Host::extension_create<HostEnergy>();
247 simgrid::surf::Host::onCreation.connect(&onCreation);
248 simgrid::surf::CpuAction::onStateChange.connect(&onActionStateChange);
249 simgrid::surf::Host::onStateChange.connect(&onHostStateChange);
250 simgrid::surf::Host::onDestruction.connect(&onHostDestruction);
253 /** @brief Returns the total energy consumed by the host so far (in Joules)
255 * See also @ref SURF_plugin_energy.
257 double sg_host_get_consumed_energy(sg_host_t host) {
258 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
259 "The Energy plugin is not active. "
260 "Please call sg_energy_plugin_init() during initialization.");
261 return host->extension<HostEnergy>()->getConsumedEnergy();
264 /** @brief Get the amount of watt dissipated at the given pstate when the host is idling */
265 double sg_host_get_wattmin_at(sg_host_t host, int pstate) {
266 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
267 "The Energy plugin is not active. "
268 "Please call sg_energy_plugin_init() during initialization.");
269 return host->extension<HostEnergy>()->getWattMinAt(pstate);
271 /** @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100% */
272 double sg_host_get_wattmax_at(sg_host_t host, int pstate) {
273 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
274 "The Energy plugin is not active. "
275 "Please call sg_energy_plugin_init() during initialization.");
276 return host->extension<HostEnergy>()->getWattMaxAt(pstate);