fix energy consumption when the host is turned off (fix #171)

[simgrid.git] / src / surf / plugins / host_energy.cpp

diff --git a/src/surf/plugins/host_energy.cpp b/src/surf/plugins/host_energy.cpp
index 17fd032..9a441b9 100644 (file)
--- a/src/surf/plugins/host_energy.cpp
+++ b/src/surf/plugins/host_energy.cpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010, 2012-2016. The SimGrid Team. All rights reserved.    */
+/* Copyright (c) 2010-2017. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -8,9 +8,10 @@
 #include "src/plugins/vm/VirtualMachineImpl.hpp"
 #include "src/surf/cpu_interface.hpp"
 
+#include "simgrid/s4u/Engine.hpp"
+
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/split.hpp>
-#include <simgrid/s4u/engine.hpp>
 #include <string>
 #include <utility>
 #include <vector>
@@ -136,7 +137,7 @@ void HostEnergy::update()
   double previous_energy = this->total_energy;
 
   double instantaneous_consumption;
-  if (host->isOff())
+  if (this->pstate == -1) // The host was off at the beginning of this time interval
     instantaneous_consumption = this->watts_off;
   else
     instantaneous_consumption = this->getCurrentWattsValue(cpu_load);
@@ -147,10 +148,13 @@ void HostEnergy::update()
 
   this->total_energy = previous_energy + energy_this_step;
   this->last_updated = finish_time;
-  this->pstate       = host->pstate();
+
   XBT_DEBUG(
       "[update_energy of %s] period=[%.2f-%.2f]; current power peak=%.0E flop/s; consumption change: %.2f J -> %.2f J",
       host->cname(), start_time, finish_time, host->pimpl_cpu->speed_.peak, previous_energy, energy_this_step);
+
+  /* Save data for the upcoming time interval: whether it's on/off and the pstate if it's on */
+  this->pstate = host->isOn() ? host->pstate() : -1;
 }
 
 HostEnergy::HostEnergy(simgrid::s4u::Host* ptr) : host(ptr), last_updated(surf_get_clock())
@@ -170,20 +174,20 @@ HostEnergy::~HostEnergy() = default;
 
 double HostEnergy::getWattMinAt(int pstate)
 {
-  xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
+  xbt_assert(not power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
   return power_range_watts_list[pstate].min;
 }
 
 double HostEnergy::getWattMaxAt(int pstate)
 {
-  xbt_assert(!power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
+  xbt_assert(not power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
   return power_range_watts_list[pstate].max;
 }
 
 /** @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(), "No power range properties specified for host %s", host->cname());
+  xbt_assert(not power_range_watts_list.empty(), "No power range properties specified for host %s", host->cname());
 
   /* min_power corresponds to the power consumed when only one core is active */
   /* max_power is the power consumed at 100% cpu load       */