#include <boost/algorithm/string.hpp>
+SIMGRID_REGISTER_PLUGIN(host_dvfs, "Dvfs support", &sg_host_dvfs_plugin_init)
+
+static simgrid::config::Flag<double> cfg_sampling_rate("plugin/dvfs/sampling-rate", {"plugin/dvfs/sampling_rate"},
+ "How often should the dvfs plugin check whether the frequency needs to be changed?", 0.1,
+ [](double val){if (val != 0.1) sg_host_dvfs_plugin_init();});
+
+static simgrid::config::Flag<std::string> cfg_governor("plugin/dvfs/governor",
+ "Which Governor should be used that adapts the CPU frequency?", "performance",
+
+ std::map<std::string, std::string>({
+ {"conservative", "TODO: Doc"},
+ {"ondemand", "TODO: Doc"},
+ {"performance", "TODO: Doc"},
+ {"powersave", "TODO: Doc"},
+ }),
+
+ [](std::string val){if (val != "performance") sg_host_dvfs_plugin_init();});
+
/** @addtogroup SURF_plugin_load
This plugin makes it very simple for users to obtain the current load for each host.
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 {
private:
simgrid::s4u::Host* const host_;
+ double sampling_rate_;
protected:
simgrid::s4u::Host* get_host() const { return host_; }
public:
- double sampling_rate;
explicit Governor(simgrid::s4u::Host* ptr) : host_(ptr) { init(); }
virtual ~Governor() = default;
+ virtual std::string get_name() = 0;
void init()
{
- const char* local_sampling_rate_config = host_->get_property(property_sampling_rate);
- double global_sampling_rate_config = simgrid::config::get_value<double>(property_sampling_rate);
+ const char* local_sampling_rate_config = host_->get_property(cfg_sampling_rate.get_name());
+ double global_sampling_rate_config = cfg_sampling_rate;
if (local_sampling_rate_config != nullptr) {
- sampling_rate = std::stod(local_sampling_rate_config);
+ sampling_rate_ = std::stod(local_sampling_rate_config);
} else {
- sampling_rate = global_sampling_rate_config;
+ sampling_rate_ = global_sampling_rate_config;
}
}
virtual void update() = 0;
- virtual std::string getName() = 0;
- double samplingRate() { return sampling_rate; }
+ double get_sampling_rate() { return sampling_rate_; }
};
/**
class Performance : public Governor {
public:
explicit Performance(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+ std::string get_name() override { return "Performance"; }
void update() override { get_host()->set_pstate(0); }
- std::string getName() override { return "Performance"; }
};
/**
class Powersave : public Governor {
public:
explicit Powersave(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+ std::string get_name() override { return "Powersave"; }
void update() override { get_host()->set_pstate(get_host()->get_pstate_count() - 1); }
- std::string getName() override { return "Powersave"; }
};
/**
* 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;
+ double freq_up_threshold_ = 0.80;
public:
explicit OnDemand(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+ std::string get_name() override { return "OnDemand"; }
- std::string getName() override { return "OnDemand"; }
void update() override
{
double load = get_host()->get_core_count() * sg_host_get_avg_load(get_host());
sg_host_load_reset(get_host()); // Only consider the period between two calls to this method!
- if (load > freq_up_threshold) {
+ if (load > freq_up_threshold_) {
get_host()->set_pstate(0); /* Run at max. performance! */
- XBT_INFO("Load: %f > threshold: %f --> changed to pstate %i", load, freq_up_threshold, 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)
*
*/
int max_pstate = get_host()->get_pstate_count() - 1;
// Load is now < freq_up_threshold; exclude pstate 0 (the fastest)
- // because pstate 0 can only be selected if load > freq_up_threshold
+ // because pstate 0 can only be selected if load > freq_up_threshold_
int new_pstate = max_pstate - load * (max_pstate + 1);
get_host()->set_pstate(new_pstate);
- XBT_DEBUG("Load: %f < threshold: %f --> changed to pstate %i", load, freq_up_threshold, new_pstate);
+ XBT_DEBUG("Load: %f < threshold: %f --> changed to pstate %i", load, freq_up_threshold_, new_pstate);
}
}
};
* > environment.
*/
class Conservative : public Governor {
- double freq_up_threshold = .8;
- double freq_down_threshold = .2;
+ double freq_up_threshold_ = .8;
+ double freq_down_threshold_ = .2;
public:
explicit Conservative(simgrid::s4u::Host* ptr) : Governor(ptr) {}
+ virtual std::string get_name() override { return "Conservative"; }
- virtual std::string getName() override { return "Conservative"; }
virtual void update() override
{
double load = get_host()->get_core_count() * sg_host_get_avg_load(get_host());
int pstate = get_host()->get_pstate();
sg_host_load_reset(get_host()); // Only consider the period between two calls to this method!
- if (load > freq_up_threshold) {
+ if (load > freq_up_threshold_) {
if (pstate != 0) {
get_host()->set_pstate(pstate - 1);
- XBT_INFO("Load: %f > threshold: %f -> increasing performance to pstate %d", load, freq_up_threshold,
+ XBT_INFO("Load: %f > threshold: %f -> increasing performance to pstate %d", load, freq_up_threshold_,
pstate - 1);
} else {
XBT_DEBUG("Load: %f > threshold: %f -> but cannot speed up even more, already in highest pstate %d", load,
- freq_up_threshold, pstate);
+ freq_up_threshold_, pstate);
}
- } else if (load < freq_down_threshold) {
+ } else if (load < freq_down_threshold_) {
int max_pstate = get_host()->get_pstate_count() - 1;
if (pstate != max_pstate) { // Are we in the slowest pstate already?
get_host()->set_pstate(pstate + 1);
- XBT_INFO("Load: %f < threshold: %f -> slowing down to pstate %d", load, freq_down_threshold, pstate + 1);
+ XBT_INFO("Load: %f < threshold: %f -> slowing down to pstate %d", load, freq_down_threshold_, pstate + 1);
} else {
XBT_DEBUG("Load: %f < threshold: %f -> cannot slow down even more, already in slowest pstate %d", load,
- freq_down_threshold, pstate);
+ freq_down_threshold_, pstate);
}
}
}
*
* For the sampling rate, use this:
*
- * - \<prop id="plugin/dvfs/sampling_rate" value="2" /\>
+ * - \<prop id="plugin/dvfs/sampling-rate" value="2" /\>
*
* This will run the update() method of the specified governor every 2 seconds
* on that host.
* these values globally. Using them within the \<host\> will overwrite this
* global configuration
*/
-class HostDvfs {
-public:
- static simgrid::xbt::Extension<simgrid::s4u::Host, HostDvfs> EXTENSION_ID;
-
- explicit HostDvfs(simgrid::s4u::Host*);
- ~HostDvfs();
-};
-
-simgrid::xbt::Extension<simgrid::s4u::Host, HostDvfs> HostDvfs::EXTENSION_ID;
-
-HostDvfs::HostDvfs(simgrid::s4u::Host* ptr) {}
-
-HostDvfs::~HostDvfs() = default;
} // namespace dvfs
} // namespace plugin
} // namespace simgrid
-using simgrid::plugin::dvfs::HostDvfs;
-
/* **************************** events callback *************************** */
static void on_host_added(simgrid::s4u::Host& host)
{
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()->get_property(property_governor);
+ const char* host_conf = daemon_proc->get_host()->get_property("plugin/dvfs/governor");
if (host_conf != nullptr) {
- dvfs_governor = std::string(daemon_proc->get_host()->get_property(property_governor));
+ dvfs_governor = std::string(host_conf);
boost::algorithm::to_lower(dvfs_governor);
} else {
- dvfs_governor = simgrid::config::get_value<std::string>(property_governor);
+ dvfs_governor = cfg_governor;
boost::algorithm::to_lower(dvfs_governor);
}
// 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());
+ simgrid::s4u::this_actor::sleep_for(governor->get_sampling_rate());
governor->update();
- XBT_DEBUG("Governor (%s) just updated!", governor->getName().c_str());
+ XBT_DEBUG("Governor (%s) just updated!", governor->get_name().c_str());
}
XBT_WARN("I should have never reached this point: daemons should be killed when all regular processes are done");
return 0;
});
- // This call must be placed in this function. Otherweise, the daemonize() call comes too late and
+ // This call must be placed in this function. Otherwise, the daemonize() call comes too late and
// SMPI will take this process as an MPI process!
daemon->daemonize();
}
/* **************************** Public interface *************************** */
+
/** \ingroup SURF_plugin_load
* \brief Initializes the HostDvfs plugin
* \details The HostDvfs plugin provides an API to get the current load of each host.
*/
void sg_host_dvfs_plugin_init()
{
- if (HostDvfs::EXTENSION_ID.valid())
+ static bool inited = false;
+ if (inited)
return;
-
- HostDvfs::EXTENSION_ID = simgrid::s4u::Host::extension_create<HostDvfs>();
+ inited = true;
sg_host_load_plugin_init();
simgrid::s4u::Host::on_creation.connect(&on_host_added);
- simgrid::config::declare_flag<double>(
- property_sampling_rate, "How often should the dvfs plugin check whether the frequency needs to be changed?", 0.1);
- simgrid::config::declare_flag<std::string>(
- property_governor, "Which Governor should be used that adapts the CPU frequency?", "performance");
}
