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()
117 // Ignore virtual machines
118 if (dynamic_cast<simgrid::surf::VirtualMachine*>(host->extension<simgrid::surf::Host>()))
121 XBT_INFO("Total energy of host %s: %f Joules",
122 host->getName().c_str(), this->getConsumedEnergy());
125 double HostEnergy::getWattMinAt(int pstate)
127 xbt_assert(!power_range_watts_list.empty(),
128 "No power range properties specified for host %s", host->getName().c_str());
129 return power_range_watts_list[pstate].first;
132 double HostEnergy::getWattMaxAt(int pstate)
134 xbt_assert(!power_range_watts_list.empty(),
135 "No power range properties specified for host %s", host->getName().c_str());
136 return power_range_watts_list[pstate].second;
139 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
140 double HostEnergy::getCurrentWattsValue(double cpu_load)
142 xbt_assert(!power_range_watts_list.empty(),
143 "No power range properties specified for host %s", host->getName().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->getPState());
148 double min_power = range.first;
149 double max_power = range.second;
150 double power_slope = max_power - min_power;
151 double current_power = min_power + cpu_load * power_slope;
153 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
154 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
156 return current_power;
159 double HostEnergy::getConsumedEnergy()
161 if(last_updated < surf_get_clock())
166 void HostEnergy::initWattsRangeList()
168 if (host->getProperties() == NULL)
170 char* all_power_values_str =
171 (char*)xbt_dict_get_or_null(host->getProperties(), "watt_per_state");
172 if (all_power_values_str == NULL)
175 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
176 int pstate_nb = xbt_dynar_length(all_power_values);
178 for (int i=0; i< pstate_nb; i++)
180 /* retrieve the power values associated with the current pstate */
181 xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
182 xbt_assert(xbt_dynar_length(current_power_values) > 1,
183 "Power properties incorrectly defined - "
184 "could not retrieve min and max power values for host %s",
185 host->getName().c_str());
187 /* min_power corresponds to the idle power (cpu load = 0) */
188 /* max_power is the power consumed at 100% cpu load */
189 power_range_watts_list.push_back(power_range(
190 atof(xbt_dynar_get_as(current_power_values, 0, char*)),
191 atof(xbt_dynar_get_as(current_power_values, 1, char*))
194 xbt_dynar_free(&all_power_values);
197 double surf_host_get_wattmin_at(sg_host_t host, int pstate)
199 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
200 "The Energy plugin is not active. "
201 "Please call sg_energy_plugin_init() during initialization.");
202 return host->extension<HostEnergy>()->getWattMinAt(pstate);
204 double surf_host_get_wattmax_at(sg_host_t host, int pstate)
206 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
207 "The Energy plugin is not active. "
208 "Please call sg_energy_plugin_init() during initialization.");
209 return host->extension<HostEnergy>()->getWattMaxAt(pstate);
212 double surf_host_get_consumed_energy(sg_host_t host)
214 xbt_assert(HostEnergy::EXTENSION_ID.valid(),
215 "The Energy plugin is not active. "
216 "Please call sg_energy_plugin_init() during initialization.");
217 return host->extension<HostEnergy>()->getConsumedEnergy();
223 /* **************************** Public interface *************************** */
225 /** \ingroup SURF_plugin_energy
226 * \brief Enable energy plugin
227 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
229 void sg_energy_plugin_init(void)
231 if (HostEnergy::EXTENSION_ID.valid())
234 HostEnergy::EXTENSION_ID = simgrid::Host::extension_create<HostEnergy>();
236 /* The following attaches an anonymous function to the Host::onCreation signal */
237 /* Search for "C++ lambda" for more information on the syntax used here */
238 simgrid::surf::Host::onCreation.connect([](simgrid::surf::Host *host) {
239 if (dynamic_cast<simgrid::surf::VirtualMachine*>(host)) // Ignore virtual machines
241 host->p_host->extension_set(new HostEnergy(host->p_host));
244 simgrid::surf::CpuAction::onStateChange.connect([](simgrid::surf::CpuAction *action,
245 e_surf_action_state_t old,
246 e_surf_action_state_t cur) {
247 const char *name = getActionCpu(action)->getName();
248 simgrid::surf::Host *host = sg_host_by_name(name)->extension<simgrid::surf::Host>();
249 simgrid::surf::VirtualMachine *vm = dynamic_cast<simgrid::surf::VirtualMachine*>(host);
250 if (vm) // If it's a VM, take the corresponding PM
251 host = vm->getPm()->extension<simgrid::surf::Host>();
253 HostEnergy *host_energy = host->p_host->extension<HostEnergy>();
255 if(host_energy->last_updated < surf_get_clock())
256 host_energy->update();
260 simgrid::surf::Host::onStateChange.connect([] (simgrid::surf::Host *host) {
261 if (dynamic_cast<simgrid::surf::VirtualMachine*>(host)) // Ignore virtual machines
264 HostEnergy *host_energy = host->p_host->extension<HostEnergy>();
266 if(host_energy->last_updated < surf_get_clock())
267 host_energy->update();
271 /** @brief Returns the total energy consumed by the host so far (in Joules)
273 * See also @ref SURF_plugin_energy.
275 double sg_host_get_consumed_energy(sg_host_t host) {
276 return simgrid::energy::surf_host_get_consumed_energy(host);
279 /** @brief Get the amount of watt dissipated at the given pstate when the host is idling */
280 double sg_host_get_wattmin_at(sg_host_t host, int pstate) {
281 return simgrid::simix::kernel(std::bind(
282 simgrid::energy::surf_host_get_wattmin_at, host, pstate
285 /** @brief Returns the amount of watt dissipated at the given pstate when the host burns CPU at 100% */
286 double sg_host_get_wattmax_at(sg_host_t host, int pstate) {
287 return simgrid::simix::kernel(std::bind(
288 simgrid::energy::surf_host_get_wattmax_at, host, pstate