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);
60 /* Computes the consumption so far. Called lazily on need. */
61 static void update_consumption(Cpu *cpu, CpuEnergy *cpu_energy) {
62 double cpu_load = lmm_constraint_get_usage(cpu->getConstraint()) / cpu->m_powerPeak;
63 double start_time = cpu_energy->last_updated;
64 double finish_time = surf_get_clock();
66 double previous_energy = cpu_energy->total_energy;
68 double instantaneous_consumption;
69 if (cpu->getState() == SURF_RESOURCE_OFF)
70 instantaneous_consumption = cpu_energy->watts_off;
72 instantaneous_consumption = cpu_energy->getCurrentWattsValue(cpu_load);
74 double energy_this_step = instantaneous_consumption*(finish_time-start_time);
76 cpu_energy->total_energy = previous_energy + energy_this_step;
77 cpu_energy->last_updated = finish_time;
79 XBT_DEBUG("[cpu_update_energy] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
80 start_time, finish_time, cpu->m_powerPeak, previous_energy, energy_this_step);
83 static void energyCpuDestructedCallback(Cpu *cpu){
84 std::map<Cpu*, CpuEnergy*>::iterator cpu_energy_it = surf_energy->find(cpu);
85 xbt_assert(cpu_energy_it != surf_energy->end(), "The cpu is not in surf_energy.");
87 CpuEnergy *cpu_energy = cpu_energy_it->second;
88 update_consumption(cpu, cpu_energy);
90 XBT_INFO("Total energy of host %s: %f Joules", cpu->getName(), cpu_energy->getConsumedEnergy());
91 delete cpu_energy_it->second;
92 surf_energy->erase(cpu_energy_it);
95 static void energyCpuActionStateChangedCallback(CpuAction *action, e_surf_action_state_t old, e_surf_action_state_t cur){
96 Cpu *cpu = getActionCpu(action);
97 CpuEnergy *cpu_energy = (*surf_energy)[cpu];
99 if(cpu_energy->last_updated < surf_get_clock())
100 update_consumption(cpu, cpu_energy);
103 static void energyStateChangedCallback(Cpu *cpu, e_surf_resource_state_t oldState, e_surf_resource_state_t newState){
104 CpuEnergy *cpu_energy = (*surf_energy)[cpu];
106 if(cpu_energy->last_updated < surf_get_clock())
107 update_consumption(cpu, cpu_energy);
110 static void sg_energy_plugin_exit()
116 /** \ingroup SURF_plugin_energy
117 * \brief Enable energy plugin
118 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
120 void sg_energy_plugin_init() {
121 if (surf_energy == NULL) {
122 surf_energy = new std::map<Cpu*, CpuEnergy*>();
123 surf_callback_connect(cpuCreatedCallbacks, energyCpuCreatedCallback);
124 surf_callback_connect(cpuDestructedCallbacks, energyCpuDestructedCallback);
125 surf_callback_connect(cpuActionStateChangedCallbacks, energyCpuActionStateChangedCallback);
126 surf_callback_connect(surfExitCallbacks, sg_energy_plugin_exit);
127 surf_callback_connect(cpuStateChangedCallbacks, energyStateChangedCallback);
134 CpuEnergy::CpuEnergy(Cpu *ptr)
138 power_range_watts_list = getWattsRangeList();
139 last_updated = surf_get_clock();
141 if (cpu->getProperties() != NULL) {
142 char* off_power_str = (char*)xbt_dict_get_or_null(cpu->getProperties(), "watt_off");
143 if (off_power_str != NULL)
144 watts_off = atof(off_power_str);
151 CpuEnergy::~CpuEnergy(){
153 xbt_dynar_t power_tuple = NULL;
154 xbt_dynar_foreach(power_range_watts_list, iter, power_tuple)
155 xbt_dynar_free(&power_tuple);
156 xbt_dynar_free(&power_range_watts_list);
160 double CpuEnergy::getWattMinAt(int pstate) {
161 xbt_dynar_t power_range_list = power_range_watts_list;
162 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
163 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
164 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
167 double CpuEnergy::getWattMaxAt(int pstate) {
168 xbt_dynar_t power_range_list = power_range_watts_list;
169 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
170 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
171 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
176 * Computes the power consumed by the host according to the current pstate and processor load
179 double CpuEnergy::getCurrentWattsValue(double cpu_load)
181 xbt_dynar_t power_range_list = power_range_watts_list;
182 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
184 /* retrieve the power values associated with the current pstate */
185 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
187 /* min_power corresponds to the idle power (cpu load = 0) */
188 /* max_power is the power consumed at 100% cpu load */
189 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
190 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
191 double power_slope = max_power - min_power;
193 double current_power = min_power + cpu_load * power_slope;
195 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
196 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
198 return current_power;
201 double CpuEnergy::getConsumedEnergy()
203 if(last_updated < surf_get_clock())
204 update_consumption(cpu, this);
208 xbt_dynar_t CpuEnergy::getWattsRangeList()
210 xbt_dynar_t power_range_list;
211 xbt_dynar_t power_tuple;
212 int i = 0, pstate_nb=0;
213 xbt_dynar_t current_power_values;
214 double min_power, max_power;
216 if (cpu->getProperties() == NULL)
219 char* all_power_values_str = (char*)xbt_dict_get_or_null(cpu->getProperties(), "watt_per_state");
221 if (all_power_values_str == NULL)
225 power_range_list = xbt_dynar_new(sizeof(xbt_dynar_t), NULL);
226 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
228 pstate_nb = xbt_dynar_length(all_power_values);
229 for (i=0; i< pstate_nb; i++)
231 /* retrieve the power values associated with the current pstate */
232 current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
233 xbt_assert(xbt_dynar_length(current_power_values) > 1,
234 "Power properties incorrectly defined - could not retrieve min and max power values for host %s",
237 /* min_power corresponds to the idle power (cpu load = 0) */
238 /* max_power is the power consumed at 100% cpu load */
239 min_power = atof(xbt_dynar_get_as(current_power_values, 0, char*));
240 max_power = atof(xbt_dynar_get_as(current_power_values, 1, char*));
242 power_tuple = xbt_dynar_new(sizeof(double), NULL);
243 xbt_dynar_push_as(power_tuple, double, min_power);
244 xbt_dynar_push_as(power_tuple, double, max_power);
246 xbt_dynar_push_as(power_range_list, xbt_dynar_t, power_tuple);
247 xbt_dynar_free(¤t_power_values);
249 xbt_dynar_free(&all_power_values);
250 return power_range_list;