private:
simgrid::s4u::Host* const host_;
double sampling_rate_;
- int min_pstate;
- int max_pstate;
+ int min_pstate; //< Never use a pstate less than this one
+ int max_pstate; //< Never use a pstate larger than this one
public:
explicit Governor(simgrid::s4u::Host* ptr)
virtual ~Governor() = default;
virtual std::string get_name() const = 0;
simgrid::s4u::Host* get_host() const { return host_; }
+ int get_min_pstate() const { return min_pstate; }
+ int get_max_pstate() const { return max_pstate; }
void init()
{
explicit Performance(simgrid::s4u::Host* ptr) : Governor(ptr) {}
std::string get_name() const override { return "Performance"; }
- void update() override { get_host()->set_pstate(min_pstate); }
+ void update() override { get_host()->set_pstate(get_min_pstate()); }
};
/**
explicit Powersave(simgrid::s4u::Host* ptr) : Governor(ptr) {}
std::string get_name() const override { return "Powersave"; }
- void update() override { get_host()->set_pstate(max_pstate); }
+ void update() override { get_host()->set_pstate(get_max_pstate()); }
};
/**
sg_host_load_reset(get_host()); // Only consider the period between two calls to this method!
if (load > freq_up_threshold_) {
- get_host()->set_pstate(min_pstate); /* Run at max. performance! */
- XBT_INFO("Load: %f > threshold: %f --> changed to pstate %i", load, freq_up_threshold_, min_pstate);
+ get_host()->set_pstate(get_min_pstate()); /* Run at max. performance! */
+ XBT_INFO("Load: %f > threshold: %f --> changed to pstate %i", load, freq_up_threshold_, get_min_pstate());
} else {
/* The actual implementation uses a formula here: (See Kernel file cpufreq_ondemand.c:158)
*
XBT_DEBUG("Load: %f < threshold: %f --> changed to pstate %i", load, freq_up_threshold_, new_pstate);
}
}
-
};
/**
sg_host_load_reset(get_host()); // Only consider the period between two calls to this method!
if (load > freq_up_threshold_) {
- if (pstate != min_pstate) {
+ if (pstate != get_min_pstate()) {
get_host()->set_pstate(pstate - 1);
XBT_INFO("Load: %f > threshold: %f -> increasing performance to pstate %d", load, freq_up_threshold_,
pstate - 1);
freq_up_threshold_, pstate);
}
} else if (load < freq_down_threshold_) {
- if (pstate != max_pstate) { // Are we in the slowest pstate already?
+ if (pstate != get_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);
} else {
public:
explicit Adagio(simgrid::s4u::Host* ptr)
- : Governor(ptr), rates(100, std::vector<double>(host_->get_pstate_count(), 0.0))
+ : Governor(ptr), rates(100, std::vector<double>(ptr->get_pstate_count(), 0.0))
{
simgrid::smpi::plugin::ampi::on_iteration_in.connect([this](simgrid::s4u::ActorPtr actor) {
// Every instance of this class subscribes to this event, so one per host
void pre_task()
{
- sg_host_load_reset(host_);
- comp_counter = sg_host_get_computed_flops(host_); // Should be 0 because of the reset
+ sg_host_load_reset(get_host());
+ comp_counter = sg_host_get_computed_flops(get_host()); // Should be 0 because of the reset
comp_timer = 0;
start_time = simgrid::s4u::Engine::get_clock();
if (rates.size() <= task_id)
- rates.resize(task_id + 5, std::vector<double>(host_->get_pstate_count(), 0.0));
+ rates.resize(task_id + 5, std::vector<double>(get_host()->get_pstate_count(), 0.0));
if (rates[task_id][best_pstate] == 0)
best_pstate = 0;
- host_->set_pstate(best_pstate); // Load our schedule
+ get_host()->set_pstate(best_pstate); // Load our schedule
XBT_DEBUG("Set pstate to %i", best_pstate);
}
void post_task()
{
- double computed_flops = sg_host_get_computed_flops(host_) - comp_counter;
+ double computed_flops = sg_host_get_computed_flops(get_host()) - comp_counter;
double target_time = (simgrid::s4u::Engine::get_clock() - start_time);
target_time =
target_time *
bool is_initialized = rates[task_id][best_pstate] != 0;
rates[task_id][best_pstate] = computed_flops / comp_timer;
if (not is_initialized) {
- for (int i = 1; i < host_->get_pstate_count(); i++) {
- rates[task_id][i] = rates[task_id][0] * (host_->get_pstate_speed(i) / host_->get_speed());
+ for (int i = 1; i < get_host()->get_pstate_count(); i++) {
+ rates[task_id][i] = rates[task_id][0] * (get_host()->get_pstate_speed(i) / get_host()->get_speed());
}
is_initialized = true;
}
- for (int pstate = host_->get_pstate_count() - 1; pstate >= 0; pstate--) {
+ for (int pstate = get_host()->get_pstate_count() - 1; pstate >= 0; pstate--) {
if (computed_flops / rates[task_id][pstate] <= target_time) {
// We just found the pstate we want to use!
best_pstate = pstate;