1 /* Copyright (c) 2017-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "simgrid/Exception.hpp"
7 #include "simgrid/plugins/energy.h"
8 #include "simgrid/s4u/Engine.hpp"
9 #include "src/surf/network_interface.hpp"
10 #include "src/surf/surf_interface.hpp"
11 #include "surf/surf.hpp"
13 #include <boost/algorithm/string/classification.hpp>
14 #include <boost/algorithm/string/split.hpp>
16 SIMGRID_REGISTER_PLUGIN(link_energy, "Link energy consumption.", &sg_link_energy_plugin_init)
18 /** @defgroup plugin_link_energy
20 This is the link energy plugin, accounting for the dissipated energy in the simulated platform.
22 The energy consumption of a link depends directly on its current traffic load. Specify that consumption in your
23 platform file as follows:
26 <link id="SWITCH1" bandwidth="125Mbps" latency="5us" sharing_policy="SHARED" >
27 <prop id="wattage_range" value="100.0:200.0" />
28 <prop id="wattage_off" value="10" />
32 The first property means that when your link is switched on, but without anything to do, it will dissipate 100 Watts.
33 If it's fully loaded, it will dissipate 200 Watts. If its load is at 50%, then it will dissipate 150 Watts.
34 The second property means that when your host is turned off, it will dissipate only 10 Watts (please note that these
35 values are arbitrary).
37 To simulate the energy-related elements, first call the simgrid#energy#sg_link_energy_plugin_init() before your
39 and then use the following function to retrieve the consumption of a given link: sg_link_get_consumed_energy().
42 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(link_energy, surf, "Logging specific to the SURF LinkEnergy plugin");
49 static simgrid::xbt::Extension<simgrid::s4u::Link, LinkEnergy> EXTENSION_ID;
51 explicit LinkEnergy(simgrid::s4u::Link* ptr) : link_(ptr), last_updated_(surf_get_clock()) {}
52 ~LinkEnergy() = default;
54 void init_watts_range_list();
55 double get_consumed_energy();
67 double total_energy_{0.0};
68 double last_updated_{0.0}; /*< Timestamp of the last energy update event*/
71 xbt::Extension<s4u::Link, LinkEnergy> LinkEnergy::EXTENSION_ID;
73 void LinkEnergy::update()
76 init_watts_range_list();
78 double power = get_power();
79 double now = surf_get_clock();
80 total_energy_ += power * (now - last_updated_);
84 void LinkEnergy::init_watts_range_list()
90 const char* all_power_values_str = this->link_->get_property("wattage_range");
91 if (all_power_values_str == nullptr) {
92 all_power_values_str = this->link_->get_property("watt_range");
93 if (all_power_values_str != nullptr)
94 XBT_WARN("Please rename the 'watt_range' property of link %s into 'wattage_range'.", link_->get_cname());
97 if (all_power_values_str == nullptr)
100 std::vector<std::string> all_power_values;
101 boost::split(all_power_values, all_power_values_str, boost::is_any_of(","));
103 for (auto current_power_values_str : all_power_values) {
104 /* retrieve the power values associated */
105 std::vector<std::string> current_power_values;
106 boost::split(current_power_values, current_power_values_str, boost::is_any_of(":"));
107 xbt_assert(current_power_values.size() == 2,
108 "Power properties incorrectly defined - could not retrieve idle and busy power values for link %s",
109 this->link_->get_cname());
111 /* min_power corresponds to the idle power (link load = 0) */
112 /* max_power is the power consumed at 100% link load */
114 idle_ = std::stod(current_power_values.front());
115 } catch (const std::invalid_argument&) {
116 throw std::invalid_argument(std::string("Invalid idle power value for link ") + this->link_->get_cname());
120 busy_ = std::stod(current_power_values.back());
121 } catch (const std::invalid_argument&) {
122 throw std::invalid_argument(std::string("Invalid busy power value for link ") + this->link_->get_cname());
127 double LinkEnergy::get_power()
132 double power_slope = busy_ - idle_;
134 double normalized_link_usage = link_->get_usage() / link_->get_bandwidth();
135 double dynamic_power = power_slope * normalized_link_usage;
137 return idle_ + dynamic_power;
140 double LinkEnergy::get_consumed_energy()
142 if (last_updated_ < surf_get_clock()) // We need to simcall this as it modifies the environment
143 kernel::actor::simcall(std::bind(&LinkEnergy::update, this));
144 return this->total_energy_;
146 } // namespace plugin
147 } // namespace simgrid
149 using simgrid::plugin::LinkEnergy;
151 /* **************************** events callback *************************** */
152 static void on_communicate(simgrid::kernel::resource::NetworkAction const& action, simgrid::s4u::Host*,
155 XBT_DEBUG("onCommunicate is called");
156 for (simgrid::kernel::resource::LinkImpl* link : action.links()) {
160 XBT_DEBUG("Update link %s", link->get_cname());
161 LinkEnergy* link_energy = link->get_iface()->extension<LinkEnergy>();
162 link_energy->init_watts_range_list();
163 link_energy->update();
167 static void on_simulation_end()
169 std::vector<simgrid::s4u::Link*> links = simgrid::s4u::Engine::get_instance()->get_all_links();
171 double total_energy = 0.0; // Total dissipated energy (whole platform)
172 for (const auto link : links) {
173 double link_energy = link->extension<LinkEnergy>()->get_consumed_energy();
174 total_energy += link_energy;
177 XBT_INFO("Total energy over all links: %f", total_energy);
179 /* **************************** Public interface *************************** */
181 int sg_link_energy_is_inited()
183 return LinkEnergy::EXTENSION_ID.valid();
185 /** @ingroup plugin_link_energy
186 * @brief Enable energy plugin
187 * @details Enable energy plugin to get joules consumption of each cpu. You should call this function before
190 void sg_link_energy_plugin_init()
192 if (LinkEnergy::EXTENSION_ID.valid())
194 LinkEnergy::EXTENSION_ID = simgrid::s4u::Link::extension_create<LinkEnergy>();
196 xbt_assert(sg_host_count() == 0, "Please call sg_link_energy_plugin_init() before initializing the platform.");
198 simgrid::s4u::Link::on_creation.connect([](simgrid::s4u::Link& link) { link.extension_set(new LinkEnergy(&link)); });
200 simgrid::s4u::Link::on_state_change.connect(
201 [](simgrid::s4u::Link const& link) { link.extension<LinkEnergy>()->update(); });
203 simgrid::s4u::Link::on_destruction.connect([](simgrid::s4u::Link const& link) {
204 if (link.get_name() != "__loopback__")
205 XBT_INFO("Energy consumption of link '%s': %f Joules", link.get_cname(),
206 link.extension<LinkEnergy>()->get_consumed_energy());
209 simgrid::s4u::Link::on_communication_state_change.connect([](
210 simgrid::kernel::resource::NetworkAction const& action, simgrid::kernel::resource::Action::State /* previous */) {
211 for (simgrid::kernel::resource::LinkImpl* link : action.links()) {
213 link->get_iface()->extension<LinkEnergy>()->update();
217 simgrid::s4u::Link::on_communicate.connect(&on_communicate);
218 simgrid::s4u::Engine::on_simulation_end.connect(&on_simulation_end);
221 /** @ingroup plugin_link_energy
222 * @brief Returns the total energy consumed by the link so far (in Joules)
224 * Please note that since the consumption is lazily updated, it may require a simcall to update it.
225 * The result is that the actor requesting this value will be interrupted,
226 * the value will be updated in kernel mode before returning the control to the requesting actor.
228 double sg_link_get_consumed_energy(sg_link_t link)
230 if (not LinkEnergy::EXTENSION_ID.valid())
231 throw simgrid::xbt::InitializationError("The Energy plugin is not active. Please call sg_link_energy_plugin_init() "
232 "before calling sg_link_get_consumed_energy().");
233 return link->extension<LinkEnergy>()->get_consumed_energy();