* under the terms of the license (GNU LGPL) which comes with this package. */
#include "simgrid/plugins/energy.h"
-#include "simgrid/plugins/load.h"
#include "simgrid/s4u/Engine.hpp"
+#include "src/include/surf/surf.hpp"
#include "src/plugins/vm/VirtualMachineImpl.hpp"
#include "src/surf/cpu_interface.hpp"
#include <boost/algorithm/string/classification.hpp>
#include <boost/algorithm/string/split.hpp>
+SIMGRID_REGISTER_PLUGIN(host_energy, "Cpu energy consumption.", &sg_host_energy_plugin_init)
+
/** @addtogroup plugin_energy
This is the energy plugin, enabling to account not only for computation time, but also for the dissipated energy in the
As a result, our energy model takes 4 parameters:
- - \b Idle: instantaneous consumption (in Watt) when your host is up and running, but without anything to do.
- - \b OneCore: instantaneous consumption (in Watt) when only one core is active, at 100%.
- - \b AllCores: instantaneous consumption (in Watt) when all cores of the host are at 100%.
- - \b Off: instantaneous consumption (in Watt) when the host is turned off.
+ - @b Idle: instantaneous consumption (in Watt) when your host is up and running, but without anything to do.
+ - @b OneCore: instantaneous consumption (in Watt) when only one core is active, at 100%.
+ - @b AllCores: instantaneous consumption (in Watt) when all cores of the host are at 100%.
+ - @b Off: instantaneous consumption (in Watt) when the host is turned off.
Here is an example of XML declaration:
-\code{.xml}
+@code{.xml}
<host id="HostA" power="100.0Mf" cores="4">
<prop id="watt_per_state" value="100.0:120.0:200.0" />
<prop id="watt_off" value="10" />
</host>
-\endcode
+@endcode
-This example gives the following parameters: \b Off is 10 Watts; \b Idle is 100 Watts; \b OneCore is 120 Watts and \b
+This example gives the following parameters: @b Off is 10 Watts; @b Idle is 100 Watts; @b OneCore is 120 Watts and @b
AllCores is 200 Watts.
This is enough to compute the consumption as a function of the amount of loaded cores:
<table>
-<tr><th>\#Cores loaded</th><th>Consumption</th><th>Explanation</th></tr>
+<tr><th>@#Cores loaded</th><th>Consumption</th><th>Explanation</th></tr>
<tr><td>0</td><td> 100 Watts</td><td>Idle value</td></tr>
<tr><td>1</td><td> 120 Watts</td><td>OneCore value</td></tr>
<tr><td>2</td><td> 147 Watts</td><td>linear extrapolation between OneCore and AllCores</td></tr>
### What if the host has only one core?
-In this case, the parameters \b OneCore and \b AllCores are obviously the same.
+In this case, the parameters @b OneCore and @b AllCores are obviously the same.
Actually, SimGrid expect an energetic profile formatted as 'Idle:Running' for mono-cores hosts.
-If you insist on passing 3 parameters in this case, then you must have the same value for \b OneCore and \b AllCores.
+If you insist on passing 3 parameters in this case, then you must have the same value for @b OneCore and @b AllCores.
-\code{.xml}
+@code{.xml}
<host id="HostC" power="100.0Mf" cores="1">
<prop id="watt_per_state" value="95.0:200.0" /> <!-- we may have used '95:200:200' instead -->
<prop id="watt_off" value="10" />
</host>
-\endcode
+@endcode
### How does DVFS interact with the host energy model?
If your host has several DVFS levels (several pstates), then you should give the energetic profile of each pstate level:
-\code{.xml}
+@code{.xml}
<host id="HostC" power="100.0Mf,50.0Mf,20.0Mf" cores="4">
<prop id="watt_per_state" value="95.0:120.0:200.0, 93.0:115.0:170.0, 90.0:110.0:150.0" />
<prop id="watt_off" value="10" />
</host>
-\endcode
+@endcode
This encodes the following values
<table>
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_energy, surf, "Logging specific to the SURF energy plugin");
+// Forwards declaration needed to make this function a friend (because friends have external linkage by default)
+static void on_simulation_end();
+
namespace simgrid {
namespace plugin {
};
class HostEnergy {
+ friend void ::on_simulation_end(); // For access to host_was_used_
public:
static simgrid::xbt::Extension<simgrid::s4u::Host, HostEnergy> EXTENSION_ID;
int pstate_ = 0;
const int pstate_off_ = -1;
+ /* Only used to split total energy into unused/used hosts.
+ * If you want to get this info for something else, rather use the host_load plugin
+ */
+ bool host_was_used_ = false;
public:
double watts_off_ = 0.0; /*< Consumption when the machine is turned off (shutdown) */
double total_energy_ = 0.0; /*< Total energy consumed by the host */
{
double start_time = this->last_updated_;
double finish_time = surf_get_clock();
-
+ //
+ // We may have start == finish if the past consumption was updated since the simcall was started
+ // for example if 2 actors requested to update the same host's consumption in a given scheduling round.
+ //
+ // Even in this case, we need to save the pstate for the next call (after this if),
+ // which may have changed since that recent update.
if (start_time < finish_time) {
double previous_energy = this->total_energy_;
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",
- host_->get_cname(), start_time, finish_time, host_->pimpl_cpu->get_speed(1.0), previous_energy,
+ XBT_DEBUG("[update_energy of %s] period=[%.8f-%.8f]; current speed=%.2E flop/s (pstate %i); total consumption before: consumption change: %.8f J -> added now: %.8f J",
+ host_->get_cname(), start_time, finish_time, host_->pimpl_cpu->get_pstate_peak_speed(this->pstate_), this->pstate_, previous_energy,
energy_this_step);
}
if (this->pstate_ == pstate_off_) // The host is off (or was off at the beginning of this time interval)
return this->watts_off_;
- double current_speed = host_->getSpeed();
+ double current_speed = host_->get_speed();
double cpu_load;
- // We may have start == finish if the past consumption was updated since the simcall was started
- // for example if 2 actors requested to update the same host's consumption in a given scheduling round.
- //
- // Even in this case, we need to save the pstate for the next call (after this big if),
- // which may have changed since that recent update.
if (current_speed <= 0)
// Some users declare a pstate of speed 0 flops (e.g., to model boot time).
if (cpu_load > 1) // A machine with a load > 1 consumes as much as a fully loaded machine, not more
cpu_load = 1;
+ if (cpu_load > 0)
+ host_was_used_ = true;
/* The problem with this model is that the load is always 0 or 1, never something less.
* Another possibility could be to model the total energy as
double power_slope = 0;
if (cpu_load > 0) { /* Something is going on, the machine is not idle */
- double min_power = range.min_;
- double max_power = range.max_;
+ min_power = range.min_;
+ max_power = range.max_;
/**
* The min_power states how much we consume when only one single
current_power = range.idle_;
}
- XBT_DEBUG("[get_current_watts] min_power=%f, max_power=%f, slope=%f", min_power, max_power, power_slope);
+ XBT_DEBUG("[get_current_watts] pstate=%i, min_power=%f, max_power=%f, slope=%f", this->pstate_, min_power, max_power, power_slope);
XBT_DEBUG("[get_current_watts] Current power (watts) = %f, load = %f", current_power, cpu_load);
return current_power;
// In this case, 1core == AllCores
current_power_values.push_back(current_power_values.at(1));
} else { // size == 3
- xbt_assert((current_power_values.at(1)) == (current_power_values.at(2)),
- "Power properties incorrectly defined for host %s.\n"
- "The energy profile of mono-cores should be formatted as 'Idle:FullSpeed' only.\n"
- "If you go for a 'Idle:OneCore:AllCores' power profile on mono-cores, then OneCore and AllCores "
- "must be equal.",
- host_->get_cname());
+ current_power_values[2] = current_power_values.at(1);
+ static bool displayed_warning = false;
+ if (not displayed_warning) { // Otherwise we get in the worst case no_pstate*no_hosts warnings
+ XBT_WARN("Host %s is a single-core machine and part of the power profile is '%s'"
+ ", which is in the 'Idle:OneCore:AllCores' format."
+ " Since this is a single-core machine, AllCores and OneCore are identical."
+ " Here, only the value for 'OneCore' is used.", host_->get_cname(), current_power_values_str.c_str());
+ displayed_warning = true;
+ }
}
} else {
xbt_assert(current_power_values.size() == 3,
host.extension_set(new HostEnergy(&host));
}
-static void on_action_state_change(simgrid::surf::CpuAction* action)
+static void on_action_state_change(simgrid::surf::CpuAction* action,
+ simgrid::kernel::resource::Action::State /*previous*/)
{
for (simgrid::surf::Cpu* const& cpu : action->cpus()) {
simgrid::s4u::Host* host = cpu->get_host();
for (size_t i = 0; i < hosts.size(); i++) {
if (dynamic_cast<simgrid::s4u::VirtualMachine*>(hosts[i]) == nullptr) { // Ignore virtual machines
- bool host_was_used = (sg_host_get_computed_flops(hosts[i]) != 0);
double energy = hosts[i]->extension<HostEnergy>()->get_consumed_energy();
total_energy += energy;
- if (host_was_used)
+ if (hosts[i]->extension<HostEnergy>()->host_was_used_)
used_hosts_energy += energy;
}
}
/* **************************** Public interface *************************** */
-/** \ingroup plugin_energy
- * \brief Enable host energy plugin
- * \details Enable energy plugin to get joules consumption of each cpu. Call this function before #MSG_init().
+/** @ingroup plugin_energy
+ * @brief Enable host energy plugin
+ * @details Enable energy plugin to get joules consumption of each cpu. Call this function before #MSG_init().
*/
void sg_host_energy_plugin_init()
{
if (HostEnergy::EXTENSION_ID.valid())
return;
- sg_host_load_plugin_init();
-
HostEnergy::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostEnergy>();
simgrid::s4u::Host::on_creation.connect(&on_creation);
