1 /* Copyright (c) 2010-2017. 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/plugins/load.h"
7 #include "simgrid/simix.hpp"
8 #include "src/plugins/vm/VirtualMachineImpl.hpp"
9 #include "src/surf/cpu_interface.hpp"
11 #include "simgrid/s4u/Engine.hpp"
13 #include <boost/algorithm/string/classification.hpp>
14 #include <boost/algorithm/string/split.hpp>
19 /** @addtogroup plugin_load
21 This plugin makes it very simple for users to obtain the current load for each host.
25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_plugin_load, surf, "Logging specific to the HostLoad plugin");
32 static simgrid::xbt::Extension<simgrid::s4u::Host, HostLoad> EXTENSION_ID;
34 explicit HostLoad(simgrid::s4u::Host* ptr);
37 double getCurrentLoad();
38 double getComputedFlops();
39 double getAverageLoad();
45 simgrid::s4u::Host* host = nullptr;
46 double last_updated = 0;
47 double last_reset = 0;
48 double current_speed = 0;
49 double current_flops = 0;
50 double computed_flops = 0;
52 long theor_max_flops = 0;
53 bool was_prev_idle = true; /* A host is idle at the beginning */
56 simgrid::xbt::Extension<simgrid::s4u::Host, HostLoad> HostLoad::EXTENSION_ID;
58 HostLoad::HostLoad(simgrid::s4u::Host* ptr)
60 , last_updated(surf_get_clock())
61 , last_reset(surf_get_clock())
62 , current_speed(host->getSpeed())
63 , current_flops(host->pimpl_cpu->constraint()->get_usage())
65 , was_prev_idle(current_flops == 0)
69 HostLoad::~HostLoad() = default;
71 void HostLoad::update()
73 double now = surf_get_clock();
74 if (last_updated < now) {
75 /* flops == pstate_speed * cores_being_currently_used */
76 computed_flops += (now - last_updated) * current_flops;
78 /* Current flop per second computed by the cpu; current_flops = k * pstate_speed_in_flops, k \in {0, 1, ..., cores}
79 * number of active cores */
80 current_flops = host->pimpl_cpu->constraint()->get_usage();
83 idle_time += (now - last_updated);
86 theor_max_flops += current_speed * host->getCoreCount() * (now - last_updated);
87 current_speed = host->getSpeed();
89 was_prev_idle = (current_flops == 0);
93 double HostLoad::getCurrentLoad()
95 return current_flops / static_cast<double>(host->getSpeed() * host->getCoreCount());
99 * Return idle time since last reset
101 double HostLoad::getIdleTime() {
105 double HostLoad::getAverageLoad()
107 return getComputedFlops() / (host->getSpeed() * host->getCoreCount() * (surf_get_clock() - last_reset));
110 double HostLoad::getComputedFlops()
114 return computed_flops;
118 * Resets the counters
120 void HostLoad::reset()
122 last_updated = surf_get_clock();
123 last_reset = surf_get_clock();
129 using simgrid::plugin::HostLoad;
131 /* **************************** events callback *************************** */
132 /* This callback is fired either when the host changes its state (on/off) or its speed
133 * (because the user changed the pstate, or because of external trace events) */
134 static void onHostChange(simgrid::s4u::Host& host)
136 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
139 host.extension<HostLoad>()->update();
142 /* This callback is called when an action (computation, idle, ...) terminates */
143 static void onActionStateChange(simgrid::surf::CpuAction* action, simgrid::surf::Action::State /*previous*/)
145 for (simgrid::surf::Cpu* const& cpu : action->cpus()) {
146 simgrid::s4u::Host* host = cpu->getHost();
148 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(host)) // Ignore virtual machines
151 if (host != nullptr) {
152 host->extension<HostLoad>()->update();
157 /* **************************** Public interface *************************** */
160 /** \ingroup plugin_load
161 * \brief Initializes the HostLoad plugin
162 * \details The HostLoad plugin provides an API to get the current load of each host.
164 void sg_host_load_plugin_init()
166 if (HostLoad::EXTENSION_ID.valid())
169 HostLoad::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostLoad>();
171 /* When attaching a callback into a signal, you can use a lambda as follows, or a regular function as done below */
173 simgrid::s4u::Host::onCreation.connect([](simgrid::s4u::Host& host) {
174 if (dynamic_cast<simgrid::s4u::VirtualMachine*>(&host)) // Ignore virtual machines
176 host.extension_set(new HostLoad(&host));
179 simgrid::surf::CpuAction::onStateChange.connect(&onActionStateChange);
180 simgrid::s4u::Host::onStateChange.connect(&onHostChange);
181 simgrid::s4u::Host::onSpeedChange.connect(&onHostChange);
184 /** @brief Returns the current load of the host passed as argument
186 * See also @ref plugin_load
188 double sg_host_get_current_load(sg_host_t host)
190 xbt_assert(HostLoad::EXTENSION_ID.valid(),
191 "The Load plugin is not active. Please call sg_host_load_plugin_init() during initialization.");
193 return host->extension<HostLoad>()->getCurrentLoad();
196 /** @brief Returns the current load of the host passed as argument
198 * See also @ref plugin_load
200 double sg_host_get_avg_load(sg_host_t host)
202 xbt_assert(HostLoad::EXTENSION_ID.valid(),
203 "The Load plugin is not active. Please call sg_host_load_plugin_init() during initialization.");
205 return host->extension<HostLoad>()->getAverageLoad();
208 /** @brief Returns the time this host was idle since the last reset
210 * See also @ref plugin_load
212 double sg_host_get_idle_time(sg_host_t host)
214 xbt_assert(HostLoad::EXTENSION_ID.valid(),
215 "The Load plugin is not active. Please call sg_host_load_plugin_init() during initialization.");
217 return host->extension<HostLoad>()->getIdleTime();
220 double sg_host_get_computed_flops(sg_host_t host)
222 xbt_assert(HostLoad::EXTENSION_ID.valid(),
223 "The Load plugin is not active. Please call sg_host_load_plugin_init() during initialization.");
225 return host->extension<HostLoad>()->getComputedFlops();
228 void sg_host_load_reset(sg_host_t host)
230 xbt_assert(HostLoad::EXTENSION_ID.valid(),
231 "The Load plugin is not active. Please call sg_host_load_plugin_init() during initialization.");
233 host->extension<HostLoad>()->reset();