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. */
7 #include <src/surf/plugins/energy.hpp>
8 #include <src/surf/cpu_interface.hpp>
9 #include <src/surf/virtual_machine.hpp>
11 /** @addtogroup SURF_plugin_energy
14 This is the energy plugin, enabling to account not only for computation time,
15 but also for the dissipated energy in the simulated platform.
17 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as follows:
20 <host id="HostA" power="100.0Mf" >
21 <prop id="watt_per_state" value="100.0:200.0" />
22 <prop id="watt_off" value="10" />
26 The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
27 If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
28 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these values are arbitrary).
30 If your CPU is using pstates, then you can provide one consumption interval per pstate.
33 <host id="HostB" power="100.0Mf,50.0Mf,20.0Mf" pstate="0" >
34 <prop id="watt_per_state" value="95.0:200.0, 93.0:170.0, 90.0:150.0" />
35 <prop id="watt_off" value="10" />
39 That host has 3 levels of performance with the following performance: 100 Mflop/s, 50 Mflop/s or 20 Mflop/s.
40 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.
41 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,
42 170 Watts and 150 Watts respectively.
44 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().
46 To simulate the energy-related elements, first call the #sg_energy_plugin_init() before your #MSG_init(),
47 and then use the following function to retrieve the consumption of a given host: #MSG_host_get_consumed_energy().
50 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf,
51 "Logging specific to the SURF energy plugin");
56 std::map<simgrid::surf::Host*, HostEnergy*> *surf_energy = NULL;
61 using simgrid::energy::HostEnergy;
62 using simgrid::energy::surf_energy;
64 /* Computes the consumption so far. Called lazily on need. */
65 static void update_consumption(simgrid::surf::Host *host, HostEnergy *host_energy) {
66 double start_time = host_energy->last_updated;
67 double finish_time = surf_get_clock();
69 if (host->p_cpu->m_speedPeak == 0)
70 // Some users declare a pstate of speed 0 flops (eg to model boot time).
71 // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
74 cpu_load = lmm_constraint_get_usage(host->p_cpu->getConstraint()) / host->p_cpu->m_speedPeak;
76 double previous_energy = host_energy->total_energy;
78 double instantaneous_consumption;
79 if (host->getState() == SURF_RESOURCE_OFF)
80 instantaneous_consumption = host_energy->watts_off;
82 instantaneous_consumption = host_energy->getCurrentWattsValue(cpu_load);
84 double energy_this_step = instantaneous_consumption*(finish_time-start_time);
86 host_energy->total_energy = previous_energy + energy_this_step;
87 host_energy->last_updated = finish_time;
89 XBT_DEBUG("[cpu_update_energy] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
90 start_time, finish_time, host->p_cpu->m_speedPeak, previous_energy, energy_this_step);
93 /** \ingroup SURF_plugin_energy
94 * \brief Enable energy plugin
95 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
97 void sg_energy_plugin_init() {
98 if (simgrid::energy::surf_energy == NULL) {
100 simgrid::energy::surf_energy = new std::map<simgrid::surf::Host*, simgrid::energy::HostEnergy*>();
102 /* The following attaches an anonymous function to the Host::onCreation signal */
103 /* Search for "C++ lambda" for more information on the syntax used here */
104 simgrid::surf::Host::onCreation.connect([](simgrid::surf::Host *host) {
105 (*surf_energy)[host] = new HostEnergy(host);
108 simgrid::surf::VMCreatedCallbacks.connect([](simgrid::surf::VirtualMachine* vm) {
109 std::map<simgrid::surf::Host*, HostEnergy*>::iterator host_energy_it =
110 surf_energy->find(vm->p_hostPM->extension(simgrid::surf::Host::EXTENSION_ID));
111 xbt_assert(host_energy_it != surf_energy->end(), "The host is not in surf_energy.");
112 (*surf_energy)[vm] = host_energy_it->second;
113 host_energy_it->second->ref(); // protect the HostEnergy from getting deleted too early
116 simgrid::surf::Host::onDestruction.connect([](simgrid::surf::Host *host) {
117 std::map<simgrid::surf::Host*, HostEnergy*>::iterator host_energy_it = surf_energy->find(host);
118 xbt_assert(host_energy_it != surf_energy->end(), "The host is not in surf_energy.");
120 HostEnergy *host_energy = host_energy_it->second;
121 update_consumption(host, host_energy);
123 if (host_energy_it->second->refcount == 1) // Don't display anything for virtual CPUs
124 XBT_INFO("Total energy of host %s: %f Joules", host->getName(), host_energy->getConsumedEnergy());
125 host_energy_it->second->unref();
126 surf_energy->erase(host_energy_it);
128 simgrid::surf::CpuAction::onStateChange.connect([](simgrid::surf::CpuAction *action,
129 e_surf_action_state_t old,
130 e_surf_action_state_t cur) {
131 const char *name = getActionCpu(action)->getName();
132 simgrid::surf::Host *host = static_cast<simgrid::surf::Host*>(surf_host_resource_priv(sg_host_by_name(name)));
134 HostEnergy *host_energy = (*surf_energy)[host];
136 if(host_energy->last_updated < surf_get_clock())
137 update_consumption(host, host_energy);
141 simgrid::surf::Host::onStateChange.connect([]
142 (simgrid::surf::Host *host,
143 e_surf_resource_state_t oldState,
144 e_surf_resource_state_t newState) {
145 HostEnergy *host_energy = (*surf_energy)[host];
147 if(host_energy->last_updated < surf_get_clock())
148 update_consumption(host, host_energy);
151 simgrid::surf::surfExitCallbacks.connect([]() {
164 HostEnergy::HostEnergy(simgrid::surf::Host *ptr)
168 power_range_watts_list = getWattsRangeList();
169 last_updated = surf_get_clock();
171 if (host->getProperties() != NULL) {
172 char* off_power_str = (char*)xbt_dict_get_or_null(host->getProperties(), "watt_off");
173 if (off_power_str != NULL)
174 watts_off = atof(off_power_str);
181 HostEnergy::~HostEnergy(){
183 xbt_dynar_t power_tuple = NULL;
184 xbt_dynar_foreach(power_range_watts_list, iter, power_tuple)
185 xbt_dynar_free(&power_tuple);
186 xbt_dynar_free(&power_range_watts_list);
190 double HostEnergy::getWattMinAt(int pstate) {
191 xbt_dynar_t power_range_list = power_range_watts_list;
192 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", host->getName());
193 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, host->p_cpu->getPState(), xbt_dynar_t);
194 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
197 double HostEnergy::getWattMaxAt(int pstate) {
198 xbt_dynar_t power_range_list = power_range_watts_list;
199 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", host->getName());
200 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, host->p_cpu->getPState(), xbt_dynar_t);
201 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
205 /** @brief Computes the power consumed by the host according to the current pstate and processor load */
206 double HostEnergy::getCurrentWattsValue(double cpu_load)
208 xbt_dynar_t power_range_list = power_range_watts_list;
209 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", host->getName());
211 int pstate = host->p_cpu->getPState();
212 xbt_assert(pstate < (int)xbt_dynar_length(power_range_list),
213 "pstate %d >= power range amound %d",pstate,(int)xbt_dynar_length(power_range_list));
214 /* retrieve the power values associated with the current pstate */
215 xbt_dynar_t current_power_values = xbt_dynar_get_as( power_range_list, pstate, xbt_dynar_t);
217 /* min_power corresponds to the idle power (cpu load = 0) */
218 /* max_power is the power consumed at 100% cpu load */
219 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
220 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
221 double power_slope = max_power - min_power;
223 double current_power = min_power + cpu_load * power_slope;
225 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
226 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
228 return current_power;
231 double HostEnergy::getConsumedEnergy()
233 if(last_updated < surf_get_clock())
234 update_consumption(host, this);
238 xbt_dynar_t HostEnergy::getWattsRangeList()
240 xbt_dynar_t power_range_list;
241 xbt_dynar_t power_tuple;
242 int i = 0, pstate_nb=0;
243 xbt_dynar_t current_power_values;
244 double min_power, max_power;
246 if (host->getProperties() == NULL)
249 char* all_power_values_str = (char*)xbt_dict_get_or_null(host->getProperties(), "watt_per_state");
251 if (all_power_values_str == NULL)
255 power_range_list = xbt_dynar_new(sizeof(xbt_dynar_t), NULL);
256 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
258 pstate_nb = xbt_dynar_length(all_power_values);
259 for (i=0; i< pstate_nb; i++)
261 /* retrieve the power values associated with the current pstate */
262 current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
263 xbt_assert(xbt_dynar_length(current_power_values) > 1,
264 "Power properties incorrectly defined - could not retrieve min and max power values for host %s",
267 /* min_power corresponds to the idle power (cpu load = 0) */
268 /* max_power is the power consumed at 100% cpu load */
269 min_power = atof(xbt_dynar_get_as(current_power_values, 0, char*));
270 max_power = atof(xbt_dynar_get_as(current_power_values, 1, char*));
272 power_tuple = xbt_dynar_new(sizeof(double), NULL);
273 xbt_dynar_push_as(power_tuple, double, min_power);
274 xbt_dynar_push_as(power_tuple, double, max_power);
276 xbt_dynar_push_as(power_range_list, xbt_dynar_t, power_tuple);
277 xbt_dynar_free(¤t_power_values);
279 xbt_dynar_free(&all_power_values);
280 return power_range_list;