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 change the pstate of a given CPU, use the following functions: #MSG_host_get_nb_pstates(), simgrid#s4u#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().
+To simulate the energy-related elements, first call the simgrid#energy#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_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf,
void HostEnergy::update()
{
simgrid::surf::Host* surf_host = host->extension<simgrid::surf::Host>();
- double start_time = this->last_updated;
- double finish_time = surf_get_clock();
- double cpu_load;
- if (surf_host->p_cpu->m_speedPeak == 0)
- // Some users declare a pstate of speed 0 flops (eg to model boot time).
- // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
- cpu_load = 1;
- else
- cpu_load = lmm_constraint_get_usage(surf_host->p_cpu->getConstraint())
- / surf_host->p_cpu->m_speedPeak;
-
- if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not mores
- cpu_load = 1;
-
- double previous_energy = this->total_energy;
-
- double instantaneous_consumption;
- if (host->isOff())
- instantaneous_consumption = this->watts_off;
- else
- instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
-
- double energy_this_step = instantaneous_consumption*(finish_time-start_time);
-
- this->total_energy = previous_energy + energy_this_step;
- this->last_updated = finish_time;
-
- XBT_DEBUG("[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
- surf_host->getName(), start_time, finish_time, surf_host->p_cpu->m_speedPeak, previous_energy, energy_this_step);
+ double start_time = this->last_updated;
+ double finish_time = surf_get_clock();
+ double cpu_load;
+ if (surf_host->p_cpu->p_speed.peak == 0)
+ // Some users declare a pstate of speed 0 flops (eg to model boot time).
+ // We consider that the machine is then fully loaded. That's arbitrary but it avoids a NaN
+ cpu_load = 1;
+ else
+ cpu_load = lmm_constraint_get_usage(surf_host->p_cpu->getConstraint())
+ / surf_host->p_cpu->p_speed.peak;
+
+ if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not mores
+ cpu_load = 1;
+
+ double previous_energy = this->total_energy;
+
+ double instantaneous_consumption;
+ if (host->is_off())
+ instantaneous_consumption = this->watts_off;
+ else
+ instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
+
+ double energy_this_step = instantaneous_consumption*(finish_time-start_time);
+
+ this->total_energy = previous_energy + energy_this_step;
+ this->last_updated = finish_time;
+
+ XBT_DEBUG("[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
+ surf_host->getName(), start_time, finish_time, surf_host->p_cpu->p_speed.peak, previous_energy, energy_this_step);
}
HostEnergy::HostEnergy(simgrid::s4u::Host *ptr) :
{
initWattsRangeList();
- if (host->getProperties() != NULL) {
- char* off_power_str = (char*)xbt_dict_get_or_null(host->getProperties(), "watt_off");
+ if (host->properties() != NULL) {
+ char* off_power_str = (char*)xbt_dict_get_or_null(host->properties(), "watt_off");
if (off_power_str != NULL)
- watts_off = atof(off_power_str);
+ watts_off = xbt_str_parse_double(off_power_str,
+ bprintf("Invalid value for property watt_off of host %s: %%s",host->name().c_str()));
else
watts_off = 0;
}
/** @brief Computes the power consumed by the host according to the current pstate and processor load */
double HostEnergy::getCurrentWattsValue(double cpu_load)
{
- xbt_assert(!power_range_watts_list.empty(),
+ xbt_assert(!power_range_watts_list.empty(),
"No power range properties specified for host %s", host->name().c_str());
/* min_power corresponds to the idle power (cpu load = 0) */
/* max_power is the power consumed at 100% cpu load */
- auto range = power_range_watts_list.at(host->getPState());
+ auto range = power_range_watts_list.at(host->pstate());
double min_power = range.first;
double max_power = range.second;
double power_slope = max_power - min_power;
- double current_power = min_power + cpu_load * power_slope;
+ double current_power = min_power + cpu_load * power_slope;
- XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
- XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
+ XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
+ XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
- return current_power;
+ return current_power;
}
double HostEnergy::getConsumedEnergy()
{
- if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
- simgrid::simix::kernel(std::bind(&HostEnergy::update, this));
+ if (last_updated < surf_get_clock()) // We need to simcall this as it modifies the environment
+ simgrid::simix::kernel(std::bind(&HostEnergy::update, this));
- return total_energy;
+ return total_energy;
}
void HostEnergy::initWattsRangeList()
{
- if (host->getProperties() == NULL)
- return;
- char* all_power_values_str =
- (char*)xbt_dict_get_or_null(host->getProperties(), "watt_per_state");
- if (all_power_values_str == NULL)
- return;
-
- xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
- int pstate_nb = xbt_dynar_length(all_power_values);
-
- for (int i=0; i< pstate_nb; i++)
- {
- /* retrieve the power values associated with the current pstate */
- xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
- xbt_assert(xbt_dynar_length(current_power_values) > 1,
- "Power properties incorrectly defined - "
+ if (host->properties() == NULL)
+ return;
+ char* all_power_values_str =
+ (char*)xbt_dict_get_or_null(host->properties(), "watt_per_state");
+ if (all_power_values_str == NULL)
+ return;
+
+ xbt_dynar_t all_power_values = xbt_str_split(all_power_values_str, ",");
+ int pstate_nb = xbt_dynar_length(all_power_values);
+
+ for (int i=0; i< pstate_nb; i++)
+ {
+ /* retrieve the power values associated with the current pstate */
+ xbt_dynar_t current_power_values = xbt_str_split(xbt_dynar_get_as(all_power_values, i, char*), ":");
+ xbt_assert(xbt_dynar_length(current_power_values) > 1,
+ "Power properties incorrectly defined - "
"could not retrieve min and max power values for host %s",
- host->name().c_str());
+ host->name().c_str());
- /* min_power corresponds to the idle power (cpu load = 0) */
- /* max_power is the power consumed at 100% cpu load */
+ /* min_power corresponds to the idle power (cpu load = 0) */
+ /* max_power is the power consumed at 100% cpu load */
power_range_watts_list.push_back(power_range(
- atof(xbt_dynar_get_as(current_power_values, 0, char*)),
- atof(xbt_dynar_get_as(current_power_values, 1, char*))
+ xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 0, char*),
+ bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->name().c_str())),
+ xbt_str_parse_double(xbt_dynar_get_as(current_power_values, 1, char*),
+ bprintf("Invalid min value for pstate %d on host %s: %%s", i, host->name().c_str()))
));
- }
- xbt_dynar_free(&all_power_values);
+
+ xbt_dynar_free(¤t_power_values);
+ }
+ xbt_dynar_free(&all_power_values);
}
}
host.extension_set(new HostEnergy(&host));
}
-static void onActionStateChange(simgrid::surf::CpuAction *action,
- e_surf_action_state_t old, e_surf_action_state_t cur) {
+static void onActionStateChange(simgrid::surf::CpuAction *action, e_surf_action_state_t previous) {
const char *name = getActionCpu(action)->getName();
simgrid::surf::Host *host = sg_host_by_name(name)->extension<simgrid::surf::Host>();
simgrid::surf::VirtualMachine *vm = dynamic_cast<simgrid::surf::VirtualMachine*>(host);
if (dynamic_cast<simgrid::surf::VirtualMachine*>(surf_host))
return;
HostEnergy *host_energy = host.extension<HostEnergy>();
- host_energy->update();
- XBT_INFO("Total energy of host %s: %f Joules",
- host.name().c_str(), host_energy->getConsumedEnergy());
+ if (host_energy != nullptr)
+ {
+ host_energy->update();
+ XBT_INFO("Total energy of host %s: %f Joules",
+ host.name().c_str(), host_energy->getConsumedEnergy());
+ }
}
/* **************************** Public interface *************************** */
