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. */
8 #include "../cpu_cas01.hpp"
10 /** @addtogroup SURF_plugin_energy
13 This is the energy plugin, enabling to account not only for computation time,
14 but also for the dissipated energy in the simulated platform.
16 The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as follows:
19 <host id="HostA" power="100.0Mf" >
20 <prop id="watt_per_state" value="100.0:200.0" />
21 <prop id="watt_off" value="10" />
25 The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
26 If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
27 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these values are arbitrary).
29 If your CPU is using pstates, then you can provide one consumption interval per pstate.
32 <host id="HostB" power="100.0Mf,50.0Mf,20.0Mf" pstate="0" >
33 <prop id="watt_per_state" value="95.0:200.0, 93.0:170.0, 90.0:150.0" />
34 <prop id="watt_off" value="10" />
38 That host has 3 levels of performance with the following performance: 100 Mflop/s, 50 Mflop/s or 20 Mflop/s.
39 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.
40 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,
41 170 Watts and 150 Watts respectively.
43 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().
45 To simulate the energy-related elements, first call the #sg_energy_plugin_init() before your #MSG_init(),
46 and then use the following function to retrieve the consumption of a given host: #MSG_host_get_consumed_energy().
49 XBT_LOG_EXTERNAL_CATEGORY(surf_kernel);
50 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf,
51 "Logging specific to the SURF energy plugin");
53 std::map<Cpu*, CpuEnergy*> *surf_energy=NULL;
55 static void energyCpuCreatedCallback(Cpu *cpu){
56 (*surf_energy)[cpu] = new CpuEnergy(cpu);
59 static void update_consumption_running(Cpu *cpu, CpuEnergy *cpu_energy) {
60 double cpu_load = lmm_constraint_get_usage(cpu->getConstraint()) / cpu->m_powerPeak;
61 double start_time = cpu_energy->last_updated;
62 double finish_time = surf_get_clock();
64 double previous_energy = cpu_energy->total_energy;
65 double energy_this_step = cpu_energy->getCurrentWattsValue(cpu_load)*(finish_time-start_time);
67 cpu_energy->total_energy = previous_energy + energy_this_step;
68 cpu_energy->last_updated = finish_time;
70 XBT_DEBUG("[cpu_update_energy] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
71 start_time, finish_time, cpu->m_powerPeak, previous_energy, energy_this_step);
73 static void update_consumption_off(Cpu *cpu, CpuEnergy *cpu_energy) {
74 double start_time = cpu_energy->last_updated;
75 double finish_time = surf_get_clock();
77 double previous_energy = cpu_energy->total_energy;
78 double energy_this_step = cpu_energy->watts_off*(finish_time-start_time);
80 cpu_energy->total_energy = previous_energy + energy_this_step;
81 cpu_energy->last_updated = finish_time;
83 XBT_DEBUG("[cpu_update_energy] off period=[%.2f-%.2f]; consumption change: %.2f J -> %.2f J",
84 start_time, finish_time, previous_energy, energy_this_step);
87 static void energyCpuDestructedCallback(Cpu *cpu){
88 std::map<Cpu*, CpuEnergy*>::iterator cpu_energy_it = surf_energy->find(cpu);
89 xbt_assert(cpu_energy_it != surf_energy->end(), "The cpu is not in surf_energy.");
91 CpuEnergy *cpu_energy = cpu_energy_it->second;
92 if (cpu->getState() == SURF_RESOURCE_OFF)
93 update_consumption_off(cpu, cpu_energy);
95 update_consumption_running(cpu, cpu_energy);
97 XBT_INFO("Total energy of host %s: %f Joules", cpu->getName(), cpu_energy->getConsumedEnergy());
98 delete cpu_energy_it->second;
99 surf_energy->erase(cpu_energy_it);
102 static void energyCpuActionStateChangedCallback(CpuAction *action, e_surf_action_state_t old, e_surf_action_state_t cur){
103 Cpu *cpu = getActionCpu(action);
104 CpuEnergy *cpu_energy = (*surf_energy)[cpu];
106 if(cpu_energy->last_updated < surf_get_clock()) {
107 update_consumption_running(cpu, cpu_energy);
111 static void energyStateChangedCallback(Cpu *cpu, e_surf_resource_state_t oldState, e_surf_resource_state_t newState){
112 CpuEnergy *cpu_energy = (*surf_energy)[cpu];
114 if(cpu_energy->last_updated < surf_get_clock()) {
115 if (oldState == SURF_RESOURCE_OFF)
116 update_consumption_off(cpu, cpu_energy);
118 update_consumption_running(cpu, cpu_energy);
122 static void sg_energy_plugin_exit()
128 /** \ingroup SURF_plugin_energy
129 * \brief Enable energy plugin
130 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
132 void sg_energy_plugin_init() {
133 if (surf_energy == NULL) {
134 surf_energy = new std::map<Cpu*, CpuEnergy*>();
135 surf_callback_connect(cpuCreatedCallbacks, energyCpuCreatedCallback);
136 surf_callback_connect(cpuDestructedCallbacks, energyCpuDestructedCallback);
137 surf_callback_connect(cpuActionStateChangedCallbacks, energyCpuActionStateChangedCallback);
138 surf_callback_connect(surfExitCallbacks, sg_energy_plugin_exit);
139 surf_callback_connect(cpuStateChangedCallbacks, energyStateChangedCallback);
146 CpuEnergy::CpuEnergy(Cpu *ptr)
150 power_range_watts_list = getWattsRangeList();
151 last_updated = surf_get_clock();
153 if (cpu->getProperties() != NULL) {
154 char* off_power_str = (char*)xbt_dict_get_or_null(cpu->getProperties(), "watt_off");
155 if (off_power_str != NULL)
156 watts_off = atof(off_power_str);
163 CpuEnergy::~CpuEnergy(){
165 xbt_dynar_t power_tuple = NULL;
166 xbt_dynar_foreach(power_range_watts_list, iter, power_tuple)
167 xbt_dynar_free(&power_tuple);
168 xbt_dynar_free(&power_range_watts_list);
172 double CpuEnergy::getWattMinAt(int pstate) {
173 xbt_dynar_t power_range_list = power_range_watts_list;
174 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
175 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
176 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
179 double CpuEnergy::getWattMaxAt(int pstate) {
180 xbt_dynar_t power_range_list = power_range_watts_list;
181 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
182 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
183 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
188 * Computes the power consumed by the host according to the current pstate and processor load
191 double CpuEnergy::getCurrentWattsValue(double cpu_load)
193 xbt_dynar_t power_range_list = power_range_watts_list;
194 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
196 /* retrieve the power values associated with the current pstate */
197 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
199 /* min_power corresponds to the idle power (cpu load = 0) */
200 /* max_power is the power consumed at 100% cpu load */
201 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
202 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
203 double power_slope = max_power - min_power;
205 double current_power = min_power + cpu_load * power_slope;
207 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
208 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
210 return current_power;
213 double CpuEnergy::getConsumedEnergy()
215 if(last_updated < surf_get_clock()) {
216 if (cpu->getState() == SURF_RESOURCE_OFF)
217 update_consumption_off(cpu, this);
219 update_consumption_running(cpu, this);
224 xbt_dynar_t CpuEnergy::getWattsRangeList()
226 xbt_dynar_t power_range_list;
227 xbt_dynar_t power_tuple;
228 int i = 0, pstate_nb=0;
229 xbt_dynar_t current_power_values;
230 double min_power, max_power;
232 if (cpu->getProperties() == NULL)
235 char* all_power_values_str = (char*)xbt_dict_get_or_null(cpu->getProperties(), "watt_per_state");
237 if (all_power_values_str == NULL)
241 power_range_list = xbt_dynar_new(sizeof(xbt_dynar_t), NULL);
242 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
244 pstate_nb = xbt_dynar_length(all_power_values);
245 for (i=0; i< pstate_nb; i++)
247 /* retrieve the power values associated with the current pstate */
248 current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
249 xbt_assert(xbt_dynar_length(current_power_values) > 1,
250 "Power properties incorrectly defined - could not retrieve min and max power values for host %s",
253 /* min_power corresponds to the idle power (cpu load = 0) */
254 /* max_power is the power consumed at 100% cpu load */
255 min_power = atof(xbt_dynar_get_as(current_power_values, 0, char*));
256 max_power = atof(xbt_dynar_get_as(current_power_values, 1, char*));
258 power_tuple = xbt_dynar_new(sizeof(double), NULL);
259 xbt_dynar_push_as(power_tuple, double, min_power);
260 xbt_dynar_push_as(power_tuple, double, max_power);
262 xbt_dynar_push_as(power_range_list, xbt_dynar_t, power_tuple);
263 xbt_dynar_free(¤t_power_values);
265 xbt_dynar_free(&all_power_values);
266 return power_range_list;