#include "../cpu_cas01.hpp"
/** @addtogroup SURF_plugin_energy
- *
- *
- * This is the energy plugin, enabling to account not only for computation time, but also for the dissipated energy in the simulated platform.
+
+
+This is the energy plugin, enabling to account not only for computation time,
+but also for the dissipated energy in the simulated platform.
+
+The energy consumption of a CPU depends directly of its current load. Specify that consumption in your platform file as follows:
+
+\verbatim
+<host id="HostA" power="100.0Mf" >
+ <prop id="watt_per_state" value="100.0:200.0" />
+ <prop id="watt_off" value="10" />
+</host>
+\endverbatim
+
+The first property means that when your host is up and running, but without anything to do, it will dissipate 100 Watts.
+If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
+The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these values are arbitrary).
+
+If your CPU is using pstates, then you can provide one consumption interval per pstate.
+
+\verbatim
+<host id="HostB" power="100.0Mf,50.0Mf,20.0Mf" pstate="0" >
+ <prop id="watt_per_state" value="95.0:200.0, 93.0:170.0, 90.0:150.0" />
+ <prop id="watt_off" value="10" />
+</host>
+\endverbatim
+
+That host has 3 levels of performance with the following performance: 100 Mflop/s, 50 Mflop/s or 20 Mflop/s.
+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.
+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,
+170 Watts and 150 Watts respectively.
+
+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().
+
+To simulate the energy-related elements, first call the #sg_energy_plugin_init() before your #MSG_init(),
+and then use the following function to retrieve the consumption of a given host: #MSG_host_get_consumed_energy().
*/
XBT_LOG_EXTERNAL_CATEGORY(surf_kernel);
(*surf_energy)[cpu] = new CpuEnergy(cpu);
}
-static void update_consumption(CpuPtr cpu, CpuEnergyPtr cpu_energy) {
+static void update_consumption_running(CpuPtr cpu, CpuEnergyPtr cpu_energy) {
double cpu_load = lmm_constraint_get_usage(cpu->getConstraint()) / cpu->m_powerPeak;
double start_time = cpu_energy->last_updated;
double finish_time = surf_get_clock();
- double current_energy = cpu_energy->total_energy;
- double action_energy = cpu_energy->getCurrentWattsValue(cpu_load)*(finish_time-start_time);
+ double previous_energy = cpu_energy->total_energy;
+ double energy_this_step = cpu_energy->getCurrentWattsValue(cpu_load)*(finish_time-start_time);
- cpu_energy->total_energy = current_energy + action_energy;
+ cpu_energy->total_energy = previous_energy + energy_this_step;
cpu_energy->last_updated = finish_time;
XBT_DEBUG("[cpu_update_energy] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
- start_time, finish_time, cpu->m_powerPeak, current_energy, action_energy);
+ start_time, finish_time, cpu->m_powerPeak, previous_energy, energy_this_step);
+}
+static void update_consumption_off(CpuPtr cpu, CpuEnergyPtr cpu_energy) {
+ double start_time = cpu_energy->last_updated;
+ double finish_time = surf_get_clock();
+
+ double previous_energy = cpu_energy->total_energy;
+ double energy_this_step = cpu_energy->watts_off*(finish_time-start_time);
+
+ cpu_energy->total_energy = previous_energy + energy_this_step;
+ cpu_energy->last_updated = finish_time;
+
+ XBT_DEBUG("[cpu_update_energy] off period=[%.2f-%.2f]; consumption change: %.2f J -> %.2f J",
+ start_time, finish_time, previous_energy, energy_this_step);
}
static void energyCpuDestructedCallback(CpuPtr cpu){
xbt_assert(cpu_energy_it != surf_energy->end(), "The cpu is not in surf_energy.");
CpuEnergyPtr cpu_energy = cpu_energy_it->second;
- update_consumption(cpu, cpu_energy);
+ if (cpu->getState() == SURF_RESOURCE_OFF)
+ update_consumption_off(cpu, cpu_energy);
+ else
+ update_consumption_running(cpu, cpu_energy);
XBT_INFO("Total energy of host %s: %f Joules", cpu->getName(), cpu_energy->getConsumedEnergy());
delete cpu_energy_it->second;
CpuEnergyPtr cpu_energy = (*surf_energy)[cpu];
if(cpu_energy->last_updated < surf_get_clock()) {
- update_consumption(cpu, cpu_energy);
+ update_consumption_running(cpu, cpu_energy);
+ }
+}
+
+static void energyStateChangedCallback(CpuPtr cpu, e_surf_resource_state_t oldState, e_surf_resource_state_t newState){
+ CpuEnergyPtr cpu_energy = (*surf_energy)[cpu];
+
+ if(cpu_energy->last_updated < surf_get_clock()) {
+ if (oldState == SURF_RESOURCE_OFF)
+ update_consumption_off(cpu, cpu_energy);
+ else
+ update_consumption_running(cpu, cpu_energy);
}
}
/** \ingroup SURF_plugin_energy
* \brief Enable energy plugin
- * \details Enable energy plugin to get joules consumption of each cpu.
+ * \details Enable energy plugin to get joules consumption of each cpu. You should call this function before #MSG_init().
*/
void sg_energy_plugin_init() {
if (surf_energy == NULL) {
surf_callback_connect(cpuDestructedCallbacks, energyCpuDestructedCallback);
surf_callback_connect(cpuActionStateChangedCallbacks, energyCpuActionStateChangedCallback);
surf_callback_connect(surfExitCallbacks, sg_energy_plugin_exit);
+ surf_callback_connect(cpuStateChangedCallbacks, energyStateChangedCallback);
}
}
total_energy = 0;
power_range_watts_list = getWattsRangeList();
last_updated = surf_get_clock();
+
+ if (cpu->getProperties() != NULL) {
+ char* off_power_str = (char*)xbt_dict_get_or_null(cpu->getProperties(), "watt_off");
+ if (off_power_str != NULL)
+ watts_off = atof(off_power_str);
+ else
+ watts_off = 0;
+ }
+
}
CpuEnergy::~CpuEnergy(){
xbt_dynar_free(&power_range_watts_list);
}
-
/**
* Computes the power consumed by the host according to the current pstate and processor load
*
double CpuEnergy::getConsumedEnergy()
{
+ if(last_updated < surf_get_clock()) {
+ if (cpu->getState() == SURF_RESOURCE_OFF)
+ update_consumption_off(cpu, this);
+ else
+ update_consumption_running(cpu, this);
+ }
return total_energy;
}
