X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ec28fefa54873e9f38f7005c4ab6d0028f69fa99..950bda8fadcd13ee3bc9c33e758b6419a0bbea7a:/src/surf/plugins/host_dvfs.cpp diff --git a/src/surf/plugins/host_dvfs.cpp b/src/surf/plugins/host_dvfs.cpp index b94c995d40..3daf923bcb 100644 --- a/src/surf/plugins/host_dvfs.cpp +++ b/src/surf/plugins/host_dvfs.cpp @@ -1,21 +1,14 @@ -/* Copyright (c) 2010, 2012-2016. The SimGrid Team. All rights reserved. */ +/* Copyright (c) 2010-2018. 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. */ #include "simgrid/plugins/dvfs.h" #include "simgrid/plugins/load.h" -#include "simgrid/simix.hpp" #include "src/plugins/vm/VirtualMachineImpl.hpp" -#include "src/surf/cpu_interface.hpp" +#include -#include -#include -#include -#include -#include -#include -#include +#include /** @addtogroup SURF_plugin_load @@ -25,6 +18,9 @@ XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_plugin_dvfs, surf, "Logging specific to the SURF HostDvfs plugin"); +static const char* property_sampling_rate = "plugin/dvfs/sampling_rate"; +static const char* property_governor = "plugin/dvfs/governor"; + namespace simgrid { namespace plugin { @@ -32,17 +28,18 @@ namespace dvfs { class Governor { protected: - simgrid::s4u::Host* host; + simgrid::s4u::Host* const host; public: double sampling_rate; - Governor(simgrid::s4u::Host* ptr) : host(ptr) { init(); } + explicit Governor(simgrid::s4u::Host* ptr) : host(ptr) { init(); } + virtual ~Governor() = default; void init() { - const char* local_sampling_rate_config = host->getProperty("plugin/dvfs/sampling_rate"); - double global_sampling_rate_config = xbt_cfg_get_double("plugin/dvfs/sampling_rate"); + const char* local_sampling_rate_config = host->getProperty(property_sampling_rate); + double global_sampling_rate_config = xbt_cfg_get_double(property_sampling_rate); if (local_sampling_rate_config != nullptr) { sampling_rate = std::stod(local_sampling_rate_config); } else { @@ -50,151 +47,245 @@ public: } } - virtual void update() = 0; + virtual void update() = 0; + virtual std::string getName() = 0; double samplingRate() { return sampling_rate; } }; +/** + * The linux kernel doc describes this governor as follows: + * https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt + * + * > The CPUfreq governor "performance" sets the CPU statically to the + * > highest frequency within the borders of scaling_min_freq and + * > scaling_max_freq. + * + * We do not support scaling_min_freq/scaling_max_freq -- we just pick the lowest frequency. + */ class Performance : public Governor { public: - Performance(simgrid::s4u::Host* ptr) : Governor(ptr) {} + explicit Performance(simgrid::s4u::Host* ptr) : Governor(ptr) {} - void update() { host->setPstate(0); } + void update() override { host->setPstate(0); } + std::string getName() override { return "Performance"; } }; +/** + * The linux kernel doc describes this governor as follows: + * https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt + * + * > The CPUfreq governor "powersave" sets the CPU statically to the + * > lowest frequency within the borders of scaling_min_freq and + * > scaling_max_freq. + * + * We do not support scaling_min_freq/scaling_max_freq -- we just pick the lowest frequency. + */ class Powersave : public Governor { public: - Powersave(simgrid::s4u::Host* ptr) : Governor(ptr) {} + explicit Powersave(simgrid::s4u::Host* ptr) : Governor(ptr) {} - void update() { host->setPstate(host->getPstatesCount() - 1); } + void update() override { host->setPstate(host->getPstatesCount() - 1); } + std::string getName() override { return "Powersave"; } }; +/** + * The linux kernel doc describes this governor as follows: + * https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt + * + * > The CPUfreq governor "ondemand" sets the CPU frequency depending on the + * > current system load. [...] when triggered, cpufreq checks + * > the CPU-usage statistics over the last period and the governor sets the + * > CPU accordingly. + */ class OnDemand : public Governor { - double freq_up_threshold = 0.95; + /** + * See https://elixir.bootlin.com/linux/v4.15.4/source/drivers/cpufreq/cpufreq_ondemand.c + * DEF_FREQUENCY_UP_THRESHOLD and od_update() + */ + double freq_up_threshold = 0.80; public: - OnDemand(simgrid::s4u::Host* ptr) : Governor(ptr) {} + explicit OnDemand(simgrid::s4u::Host* ptr) : Governor(ptr) {} - void update() + std::string getName() override { return "OnDemand"; } + void update() override { - double load = sg_host_get_current_load(host); + double load = host->getCoreCount() * sg_host_get_avg_load(host); + sg_host_load_reset(host); // Only consider the period between two calls to this method! if (load > freq_up_threshold) { host->setPstate(0); /* Run at max. performance! */ - XBT_INFO("Changed to pstate %f", 0.0); + XBT_INFO("Load: %f > threshold: %f --> changed to pstate %i", load, freq_up_threshold, 0); } else { /* The actual implementation uses a formula here: (See Kernel file cpufreq_ondemand.c:158) * - * freq_next = min_f + load * (max_f - min_f) / 100; + * freq_next = min_f + load * (max_f - min_f) / 100 * * So they assume that frequency increases by 100 MHz. We will just use - * lowest_pstate - load*pstatesCount(); + * lowest_pstate - load*pstatesCount() */ int max_pstate = host->getPstatesCount() - 1; + // Load is now < freq_up_threshold; exclude pstate 0 (the fastest) + // because pstate 0 can only be selected if load > freq_up_threshold + int new_pstate = max_pstate - load * (max_pstate + 1); + host->setPstate(new_pstate); - host->setPstate(max_pstate - load * max_pstate); - XBT_INFO("Changed to pstate %f -- check: %i", max_pstate - load * max_pstate, host->getPstate()); + XBT_DEBUG("Load: %f < threshold: %f --> changed to pstate %i", load, freq_up_threshold, new_pstate); } } }; +/** + * This is the conservative governor, which is very similar to the + * OnDemand governor. The Linux Kernel Documentation describes it + * very well, see https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt: + * + * > The CPUfreq governor "conservative", much like the "ondemand" + * > governor, sets the CPU frequency depending on the current usage. It + * > differs in behaviour in that it gracefully increases and decreases the + * > CPU speed rather than jumping to max speed the moment there is any load + * > on the CPU. This behaviour is more suitable in a battery powered + * > environment. + */ class Conservative : public Governor { double freq_up_threshold = .8; double freq_down_threshold = .2; public: - Conservative(simgrid::s4u::Host* ptr) : Governor(ptr) {} + explicit Conservative(simgrid::s4u::Host* ptr) : Governor(ptr) {} - void update() + virtual std::string getName() override { return "Conservative"; } + virtual void update() override { - double load = sg_host_get_current_load(host); + double load = host->getCoreCount() * sg_host_get_avg_load(host); int pstate = host->getPstate(); + sg_host_load_reset(host); // Only consider the period between two calls to this method! if (load > freq_up_threshold) { if (pstate != 0) { host->setPstate(pstate - 1); - XBT_INFO("Increasing performance to pstate %d", pstate - 1); + XBT_INFO("Load: %f > threshold: %f -> increasing performance to pstate %d", load, freq_up_threshold, pstate - 1); } else { - XBT_DEBUG("Cannot speed up even more, already in slowest pstate %d", pstate); + XBT_DEBUG("Load: %f > threshold: %f -> but cannot speed up even more, already in highest pstate %d", load, freq_up_threshold, pstate); } - } - - if (load < freq_down_threshold) { + } else if (load < freq_down_threshold) { int max_pstate = host->getPstatesCount() - 1; if (pstate != max_pstate) { // Are we in the slowest pstate already? host->setPstate(pstate + 1); - XBT_INFO("Slowing down to pstate %d", pstate + 1); + XBT_INFO("Load: %f < threshold: %f -> slowing down to pstate %d", load, freq_down_threshold, pstate + 1); } else { - XBT_DEBUG("Cannot slow down even more, already in slowest pstate %d", pstate); + XBT_DEBUG("Load: %f < threshold: %f -> cannot slow down even more, already in slowest pstate %d", load, freq_down_threshold, pstate); } } } }; -} +/** + * Add this to your host tag: + * - + * + * Valid values as of now are: performance, powersave, ondemand, conservative + * It doesn't matter if you use uppercase or lowercase. + * + * For the sampling rate, use this: + * + * - + * + * This will run the update() method of the specified governor every 2 seconds + * on that host. + * + * These properties can also be used within the tag to configure + * these values globally. Using them within the will overwrite this + * global configuration + */ class HostDvfs { public: static simgrid::xbt::Extension EXTENSION_ID; - explicit HostDvfs(simgrid::s4u::Host* ptr); + explicit HostDvfs(simgrid::s4u::Host*); ~HostDvfs(); - -private: - simgrid::s4u::Host* host = nullptr; }; simgrid::xbt::Extension HostDvfs::EXTENSION_ID; -HostDvfs::HostDvfs(simgrid::s4u::Host* ptr) : host(ptr) -{ -} +HostDvfs::HostDvfs(simgrid::s4u::Host* ptr) {} HostDvfs::~HostDvfs() = default; } } +} -using simgrid::plugin::HostDvfs; +using simgrid::plugin::dvfs::HostDvfs; /* **************************** events callback *************************** */ -static int check(int argc, char* argv[]); - static void on_host_added(simgrid::s4u::Host& host) { if (dynamic_cast(&host)) // Ignore virtual machines return; - // host.extension_set(new HostDvfs(&host)); - // This call must be placed in this function. Otherweise, the daemonize() call comes too late and - // SMPI will take this process as an MPI process! - MSG_process_daemonize(MSG_process_create("daemon", check, NULL, &host)); -} + std::string name = std::string("dvfs-daemon-") + host.get_cname(); + simgrid::s4u::ActorPtr daemon = simgrid::s4u::Actor::create(name.c_str(), &host, []() { + /** + * This lambda function is the function the actor (daemon) will execute + * all the time - in the case of the dvfs plugin, this controls when to + * lower/raise the frequency. + */ + simgrid::s4u::ActorPtr daemon_proc = simgrid::s4u::Actor::self(); + + XBT_DEBUG("DVFS process on %s is a daemon: %d", daemon_proc->get_host()->get_cname(), daemon_proc->is_daemon()); + + std::string dvfs_governor; + const char* host_conf = daemon_proc->get_host()->getProperty(property_governor); + if (host_conf != nullptr) { + dvfs_governor = std::string(daemon_proc->get_host()->getProperty(property_governor)); + boost::algorithm::to_lower(dvfs_governor); + } else { + dvfs_governor = xbt_cfg_get_string(property_governor); + boost::algorithm::to_lower(dvfs_governor); + } -static int check(int argc, char* argv[]) -{ - msg_host_t host = MSG_host_self(); - - int isDaemon = (MSG_process_self())->getImpl()->isDaemon(); - XBT_INFO("Bin ein Daemon: %d", isDaemon); - - simgrid::plugin::dvfs::Conservative governor(host); - while (1) { - // Sleep before updating; important for startup (i.e., t = 0). - // In the beginning, we want to go with the pstates specified in the platform file - // (so we sleep first) - MSG_process_sleep(governor.samplingRate()); - governor.update(); - XBT_INFO("Governor just updated!"); - } + auto governor = [&dvfs_governor, &daemon_proc]() { + if (dvfs_governor == "conservative") { + return std::unique_ptr( + new simgrid::plugin::dvfs::Conservative(daemon_proc->get_host())); + } else if (dvfs_governor == "ondemand") { + return std::unique_ptr( + new simgrid::plugin::dvfs::OnDemand(daemon_proc->get_host())); + } else if (dvfs_governor == "performance") { + return std::unique_ptr( + new simgrid::plugin::dvfs::Performance(daemon_proc->get_host())); + } else if (dvfs_governor == "powersave") { + return std::unique_ptr( + new simgrid::plugin::dvfs::Powersave(daemon_proc->get_host())); + } else { + XBT_CRITICAL("No governor specified for host %s, falling back to Performance", + daemon_proc->get_host()->get_cname()); + return std::unique_ptr( + new simgrid::plugin::dvfs::Performance(daemon_proc->get_host())); + } + }(); + + while (1) { + // Sleep *before* updating; important for startup (i.e., t = 0). + // In the beginning, we want to go with the pstates specified in the platform file + // (so we sleep first) + simgrid::s4u::this_actor::sleep_for(governor->samplingRate()); + governor->update(); + XBT_DEBUG("Governor (%s) just updated!", governor->getName().c_str()); + } - // const char* dvfs_governor = host->property("plugin/dvfs/governor"); + XBT_WARN("I should have never reached this point: daemons should be killed when all regular processes are done"); + return 0; + }); - XBT_INFO("I will never reach that point: daemons are killed when regular processes are done"); - return 0; + // This call must be placed in this function. Otherweise, the daemonize() call comes too late and + // SMPI will take this process as an MPI process! + daemon->daemonize(); } /* **************************** Public interface *************************** */ -SG_BEGIN_DECL() /** \ingroup SURF_plugin_load * \brief Initializes the HostDvfs plugin @@ -210,8 +301,8 @@ void sg_host_dvfs_plugin_init() sg_host_load_plugin_init(); simgrid::s4u::Host::onCreation.connect(&on_host_added); - xbt_cfg_register_double("plugin/dvfs/sampling_rate", 0.1, nullptr, + xbt_cfg_register_double(property_sampling_rate, 0.1, nullptr, "How often should the dvfs plugin check whether the frequency needs to be changed?"); + xbt_cfg_register_string(property_governor, "performance", nullptr, + "Which Governor should be used that adapts the CPU frequency?"); } - -SG_END_DECL()