X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/2d2995483b57463581ffdc4365fe1999ddc306c2..fc45b14055d16a944771ccf34cd94f5511e6fb24:/src/plugins/host_energy.cpp diff --git a/src/plugins/host_energy.cpp b/src/plugins/host_energy.cpp index 734f5ea174..340c283b50 100644 --- a/src/plugins/host_energy.cpp +++ b/src/plugins/host_energy.cpp @@ -13,6 +13,8 @@ #include #include +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 @@ -27,26 +29,26 @@ abnormality when all the cores are idle. The full details are in 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} -\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: - + @@ -62,27 +64,27 @@ the time, and our model holds. ### 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} -\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} -\endcode +@endcode This encodes the following values
\#Cores loadedConsumptionExplanation
@#Cores loadedConsumptionExplanation
0 100 WattsIdle value
1 120 WattsOneCore value
2 147 Wattslinear extrapolation between OneCore and AllCores
@@ -157,7 +159,12 @@ void HostEnergy::update() { 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_; @@ -170,9 +177,8 @@ void HostEnergy::update() 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); } @@ -224,11 +230,6 @@ double HostEnergy::get_current_watts_value() 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). @@ -302,7 +303,7 @@ double HostEnergy::get_current_watts_value(double cpu_load) 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; @@ -340,12 +341,15 @@ void HostEnergy::init_watts_range_list() // 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 thread_local 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, @@ -449,9 +453,9 @@ static void on_simulation_end() /* **************************** 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() {