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"
9 #include "../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");
53 std::map<Cpu*, CpuEnergy*> *surf_energy=NULL;
55 static void energyCpuCreatedCallback(Cpu *cpu){
56 (*surf_energy)[cpu] = new CpuEnergy(cpu);
59 static void energyVMCreatedCallback(VirtualMachine* vm) {
60 std::map<Cpu*, CpuEnergy*>::iterator cpu_energy_it = surf_energy->find(vm->p_subWs->p_cpu);
61 xbt_assert(cpu_energy_it != surf_energy->end(), "The cpu is not in surf_energy.");
62 (*surf_energy)[vm->p_cpu] = cpu_energy_it->second;
63 cpu_energy_it->second->ref(); // protect the CpuEnergy from getting deleted too early
66 /* Computes the consumption so far. Called lazily on need. */
67 static void update_consumption(Cpu *cpu, CpuEnergy *cpu_energy) {
68 double cpu_load = lmm_constraint_get_usage(cpu->getConstraint()) / cpu->m_powerPeak;
69 double start_time = cpu_energy->last_updated;
70 double finish_time = surf_get_clock();
72 double previous_energy = cpu_energy->total_energy;
74 double instantaneous_consumption;
75 if (cpu->getState() == SURF_RESOURCE_OFF)
76 instantaneous_consumption = cpu_energy->watts_off;
78 instantaneous_consumption = cpu_energy->getCurrentWattsValue(cpu_load);
80 double energy_this_step = instantaneous_consumption*(finish_time-start_time);
82 cpu_energy->total_energy = previous_energy + energy_this_step;
83 cpu_energy->last_updated = finish_time;
85 XBT_DEBUG("[cpu_update_energy] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
86 start_time, finish_time, cpu->m_powerPeak, previous_energy, energy_this_step);
89 static void energyCpuDestructedCallback(Cpu *cpu){
90 std::map<Cpu*, CpuEnergy*>::iterator cpu_energy_it = surf_energy->find(cpu);
91 xbt_assert(cpu_energy_it != surf_energy->end(), "The cpu is not in surf_energy.");
93 CpuEnergy *cpu_energy = cpu_energy_it->second;
94 update_consumption(cpu, cpu_energy);
96 if (cpu_energy_it->second->refcount == 1) // Don't display anything for virtual CPUs
97 XBT_INFO("Total energy of host %s: %f Joules", cpu->getName(), cpu_energy->getConsumedEnergy());
98 cpu_energy_it->second->unref();
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);
105 CpuEnergy *cpu_energy = (*surf_energy)[cpu];
107 if(cpu_energy->last_updated < surf_get_clock())
108 update_consumption(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 update_consumption(cpu, cpu_energy);
118 static void sg_energy_plugin_exit()
124 /** \ingroup SURF_plugin_energy
125 * \brief Enable energy plugin
126 * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
128 void sg_energy_plugin_init() {
129 if (surf_energy == NULL) {
130 surf_energy = new std::map<Cpu*, CpuEnergy*>();
131 surf_callback_connect(cpuCreatedCallbacks, energyCpuCreatedCallback);
132 surf_callback_connect(VMCreatedCallbacks, energyVMCreatedCallback);
133 surf_callback_connect(cpuDestructedCallbacks, energyCpuDestructedCallback);
134 surf_callback_connect(cpuActionStateChangedCallbacks, energyCpuActionStateChangedCallback);
135 surf_callback_connect(surfExitCallbacks, sg_energy_plugin_exit);
136 surf_callback_connect(cpuStateChangedCallbacks, energyStateChangedCallback);
143 CpuEnergy::CpuEnergy(Cpu *ptr)
147 power_range_watts_list = getWattsRangeList();
148 last_updated = surf_get_clock();
150 if (cpu->getProperties() != NULL) {
151 char* off_power_str = (char*)xbt_dict_get_or_null(cpu->getProperties(), "watt_off");
152 if (off_power_str != NULL)
153 watts_off = atof(off_power_str);
160 CpuEnergy::~CpuEnergy(){
162 xbt_dynar_t power_tuple = NULL;
163 xbt_dynar_foreach(power_range_watts_list, iter, power_tuple)
164 xbt_dynar_free(&power_tuple);
165 xbt_dynar_free(&power_range_watts_list);
169 double CpuEnergy::getWattMinAt(int pstate) {
170 xbt_dynar_t power_range_list = power_range_watts_list;
171 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
172 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
173 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
176 double CpuEnergy::getWattMaxAt(int pstate) {
177 xbt_dynar_t power_range_list = power_range_watts_list;
178 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
179 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
180 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
185 * Computes the power consumed by the host according to the current pstate and processor load
188 double CpuEnergy::getCurrentWattsValue(double cpu_load)
190 xbt_dynar_t power_range_list = power_range_watts_list;
191 xbt_assert(power_range_watts_list, "No power range properties specified for host %s", cpu->getName());
193 /* retrieve the power values associated with the current pstate */
194 xbt_dynar_t current_power_values = xbt_dynar_get_as(power_range_list, static_cast<CpuCas01*>(cpu)->getPState(), xbt_dynar_t);
196 /* min_power corresponds to the idle power (cpu load = 0) */
197 /* max_power is the power consumed at 100% cpu load */
198 double min_power = xbt_dynar_get_as(current_power_values, 0, double);
199 double max_power = xbt_dynar_get_as(current_power_values, 1, double);
200 double power_slope = max_power - min_power;
202 double current_power = min_power + cpu_load * power_slope;
204 XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
205 XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
207 return current_power;
210 double CpuEnergy::getConsumedEnergy()
213 if(last_updated < surf_get_clock())
214 update_consumption(cpu, this);
219 xbt_dynar_t CpuEnergy::getWattsRangeList()
221 xbt_dynar_t power_range_list;
222 xbt_dynar_t power_tuple;
223 int i = 0, pstate_nb=0;
224 xbt_dynar_t current_power_values;
225 double min_power, max_power;
227 if (cpu->getProperties() == NULL)
230 char* all_power_values_str = (char*)xbt_dict_get_or_null(cpu->getProperties(), "watt_per_state");
232 if (all_power_values_str == NULL)
236 power_range_list = xbt_dynar_new(sizeof(xbt_dynar_t), NULL);
237 xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
239 pstate_nb = xbt_dynar_length(all_power_values);
240 for (i=0; i< pstate_nb; i++)
242 /* retrieve the power values associated with the current pstate */
243 current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
244 xbt_assert(xbt_dynar_length(current_power_values) > 1,
245 "Power properties incorrectly defined - could not retrieve min and max power values for host %s",
248 /* min_power corresponds to the idle power (cpu load = 0) */
249 /* max_power is the power consumed at 100% cpu load */
250 min_power = atof(xbt_dynar_get_as(current_power_values, 0, char*));
251 max_power = atof(xbt_dynar_get_as(current_power_values, 1, char*));
253 power_tuple = xbt_dynar_new(sizeof(double), NULL);
254 xbt_dynar_push_as(power_tuple, double, min_power);
255 xbt_dynar_push_as(power_tuple, double, max_power);
257 xbt_dynar_push_as(power_range_list, xbt_dynar_t, power_tuple);
258 xbt_dynar_free(¤t_power_values);
260 xbt_dynar_free(&all_power_values);
261 return power_range_list;