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scheduled_thread_pool_impl.hpp
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scheduled_thread_pool_impl.hpp
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// Copyright (c) 2017 Shoshana Jakobovits
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#if !defined(HPX_SCHEDULED_THREAD_POOL_IMPL_HPP)
#define HPX_SCHEDULED_THREAD_POOL_IMPL_HPP
#include <hpx/apply.hpp>
#include <hpx/compat/barrier.hpp>
#include <hpx/compat/mutex.hpp>
#include <hpx/compat/thread.hpp>
#include <hpx/exception.hpp>
#include <hpx/exception_info.hpp>
#include <hpx/lcos/future.hpp>
#include <hpx/lcos/local/packaged_task.hpp>
#include <hpx/runtime/resource/detail/partitioner.hpp>
#include <hpx/runtime/threads/detail/create_thread.hpp>
#include <hpx/runtime/threads/detail/create_work.hpp>
#include <hpx/runtime/threads/detail/scheduled_thread_pool.hpp>
#include <hpx/runtime/threads/detail/scheduling_loop.hpp>
#include <hpx/runtime/threads/detail/set_thread_state.hpp>
#include <hpx/runtime/threads/policies/callback_notifier.hpp>
#include <hpx/runtime/threads/policies/scheduler_base.hpp>
#include <hpx/runtime/threads/policies/scheduler_mode.hpp>
#include <hpx/runtime/threads/policies/schedulers.hpp>
#include <hpx/runtime/threads/thread_data.hpp>
#include <hpx/runtime/threads/thread_helpers.hpp>
#include <hpx/runtime/threads/threadmanager.hpp>
#include <hpx/state.hpp>
#include <hpx/throw_exception.hpp>
#include <hpx/util/assert.hpp>
#include <hpx/util/detail/yield_k.hpp>
#include <hpx/util/unlock_guard.hpp>
#include <boost/system/system_error.hpp>
#include <hpx/runtime/threads/policies/hwloc_topology_info.hpp>
#include <algorithm>
#include <atomic>
#include <numeric>
#include <cstddef>
#include <cstdint>
#include <exception>
#include <functional>
#include <iosfwd>
#include <memory>
#include <string>
#include <utility>
#include <vector>
namespace hpx { namespace threads { namespace detail
{
///////////////////////////////////////////////////////////////////////////
struct manage_active_thread_count
{
manage_active_thread_count(std::atomic<long>& counter)
: counter_(counter)
{
}
~manage_active_thread_count()
{
--counter_;
}
std::atomic<long>& counter_;
};
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
struct init_tss_helper
{
init_tss_helper(
scheduled_thread_pool<Scheduler>& pool,
std::size_t pool_thread_num, std::size_t offset)
: pool_(pool)
, thread_num_(pool_thread_num)
, thread_manager_(nullptr)
{
pool.notifier_.on_start_thread(pool_thread_num);
thread_manager_ = &threads::get_thread_manager();
thread_manager_->init_tss(pool_thread_num + offset);
pool.sched_->Scheduler::on_start_thread(pool_thread_num);
}
~init_tss_helper()
{
pool_.sched_->Scheduler::on_stop_thread(thread_num_);
thread_manager_->deinit_tss();
pool_.notifier_.on_stop_thread(thread_num_);
}
scheduled_thread_pool<Scheduler>& pool_;
std::size_t thread_num_;
threadmanager* thread_manager_;
};
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
scheduled_thread_pool<Scheduler>::scheduled_thread_pool(
std::unique_ptr<Scheduler> sched,
threads::policies::callback_notifier& notifier, std::size_t index,
std::string const& pool_name, policies::scheduler_mode m,
std::size_t thread_offset)
: thread_pool_base(notifier, index, pool_name, m, thread_offset)
, sched_(std::move(sched))
, thread_count_(0)
, tasks_scheduled_(0)
{
sched_->set_parent_pool(this);
}
template <typename Scheduler>
scheduled_thread_pool<Scheduler>::~scheduled_thread_pool()
{
if (!threads_.empty())
{
if (!sched_->Scheduler::has_reached_state(state_suspended))
{
// still running
lcos::local::no_mutex mtx;
std::unique_lock<lcos::local::no_mutex> l(mtx);
stop_locked(l);
}
threads_.clear();
}
}
template <typename Scheduler>
void scheduled_thread_pool<Scheduler>::print_pool(std::ostream& os)
{
os << "[pool \"" << id_.name() << "\", #" << id_.index()
<< "] with scheduler " << sched_->Scheduler::get_scheduler_name()
<< "\n"
<< "is running on PUs : \n";
os << std::hex << HPX_CPU_MASK_PREFIX << get_used_processing_units()
<< '\n';
os << "on numa domains : \n" << get_numa_domain_bitmap() << '\n';
}
template <typename Scheduler>
void scheduled_thread_pool<Scheduler>::report_error(
std::size_t num, std::exception_ptr const& e)
{
sched_->Scheduler::set_all_states(state_terminating);
this->thread_pool_base::report_error(num, e);
sched_->Scheduler::on_error(num, e);
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
hpx::state scheduled_thread_pool<Scheduler>::get_state() const
{
// get_worker_thread_num returns the global thread number which
// might be too large. This function might get called from within
// background_work inside the os executors
if (thread_count_ != 0)
{
std::size_t num_thread = get_worker_thread_num() % thread_count_;
if (num_thread != std::size_t(-1))
return get_state(num_thread);
}
return sched_->Scheduler::get_minmax_state().second;
}
template <typename Scheduler>
hpx::state scheduled_thread_pool<Scheduler>::get_state(
std::size_t num_thread) const
{
HPX_ASSERT(num_thread != std::size_t(-1));
return sched_->Scheduler::get_state(num_thread).load();
}
template <typename Scheduler>
template <typename Lock>
void scheduled_thread_pool<Scheduler>::stop_locked(Lock& l, bool blocking)
{
LTM_(info) << "stop: " << id_.name() << " blocking(" << std::boolalpha
<< blocking << ")";
if (!threads_.empty())
{
// wake up if suspended
resume();
// set state to stopping
sched_->Scheduler::set_all_states(state_stopping);
// make sure we're not waiting
sched_->Scheduler::do_some_work(std::size_t(-1));
if (blocking)
{
for (std::size_t i = 0; i != threads_.size(); ++i)
{
// skip this if already stopped
if (!threads_[i].joinable())
continue;
// make sure no OS thread is waiting
LTM_(info) << "stop: " << id_.name() << " notify_all";
sched_->Scheduler::do_some_work(std::size_t(-1));
LTM_(info) << "stop: " << id_.name() << " join:" << i;
{
// unlock the lock while joining
util::unlock_guard<Lock> ul(l);
remove_processing_unit_internal(i);
}
}
threads_.clear();
}
}
}
template <typename Scheduler>
void scheduled_thread_pool<Scheduler>::stop(
std::unique_lock<compat::mutex>& l, bool blocking)
{
HPX_ASSERT(l.owns_lock());
return stop_locked(l, blocking);
}
template <typename Scheduler>
bool hpx::threads::detail::scheduled_thread_pool<Scheduler>::run(
std::unique_lock<compat::mutex>& l, std::size_t pool_threads)
{
HPX_ASSERT(l.owns_lock());
LTM_(info) //-V128
<< "run: " << id_.name()
<< " number of processing units available: " //-V128
<< threads::hardware_concurrency();
LTM_(info) //-V128
<< "run: " << id_.name() << " creating " << pool_threads
<< " OS thread(s)"; //-V128
if (0 == pool_threads)
{
HPX_THROW_EXCEPTION(
bad_parameter, "run", "number of threads is zero");
}
if (!threads_.empty() ||
sched_->Scheduler::has_reached_state(state_running))
{
return true; // do nothing if already running
}
init_perf_counter_data(pool_threads);
this->init_pool_time_scale();
LTM_(info) << "run: " << id_.name()
<< " timestamp_scale: " << timestamp_scale_; //-V128
// run threads and wait for initialization to complete
std::size_t thread_num = 0;
std::shared_ptr<compat::barrier> startup =
std::make_shared<compat::barrier>(pool_threads + 1);
try
{
auto const& rp = resource::get_partitioner();
for (/**/; thread_num != pool_threads; ++thread_num)
{
std::size_t global_thread_num = this->thread_offset_ + thread_num;
threads::mask_cref_type mask = rp.get_pu_mask(global_thread_num);
// thread_num ordering: 1. threads of default pool
// 2. threads of first special pool
// 3. etc.
// get_pu_mask expects index according to ordering of masks
// in affinity_data::affinity_masks_
// which is in order of occupied PU
LTM_(info) //-V128
<< "run: " << id_.name() << " create OS thread "
<< global_thread_num //-V128
<< ": will run on processing units within this mask: "
<< std::hex << HPX_CPU_MASK_PREFIX << mask;
// create a new thread
add_processing_unit_internal(
thread_num, global_thread_num, startup);
// set the new threads affinity (on Windows systems)
if (!any(mask))
{
LTM_(debug) //-V128
<< "run: " << id_.name()
<< " setting thread affinity on OS thread " //-V128
<< global_thread_num << " was explicitly disabled.";
}
}
// wait for all threads to have started up
startup->wait();
HPX_ASSERT(pool_threads == std::size_t(thread_count_.load()));
}
catch (std::exception const& e)
{
LTM_(always) << "run: " << id_.name()
<< " failed with: " << e.what();
// trigger the barrier
pool_threads -= (thread_num + 1);
while (pool_threads-- != 0)
startup->wait();
stop_locked(l);
threads_.clear();
return false;
}
LTM_(info) << "run: " << id_.name() << " running";
return true;
}
template <typename Scheduler>
template <typename F>
void scheduled_thread_pool<Scheduler>::suspend_func(F&& callback, error_code& ec)
{
for (std::size_t k = 0;
sched_->Scheduler::get_thread_count() >
get_background_thread_count();
++k)
{
util::detail::yield_k(k, "scheduled_thread_pool::suspend_func");
}
for (std::size_t i = 0; i != threads_.size(); ++i)
{
suspend_processing_unit_internal(i, ec);
}
callback();
}
template <typename Scheduler>
template <typename F>
void scheduled_thread_pool<Scheduler>::suspend_internal(F&& callback, error_code& ec)
{
if (threads::get_self_ptr() && hpx::this_thread::get_pool() == this)
{
HPX_THROWS_IF(ec, bad_parameter,
"scheduled_thread_pool<Scheduler>::suspend",
"cannot suspend a pool from itself");
return;
}
auto suspend_func_wrapper =
[this, callback{std::move(callback)}, ec]() mutable
{
this->suspend_func(callback, ec);
};
if (threads::get_self_ptr())
{
hpx::apply(std::move(suspend_func_wrapper));
}
else
{
compat::thread(std::move(suspend_func_wrapper)).detach();
}
}
template <typename Scheduler>
future<void> scheduled_thread_pool<Scheduler>::suspend(error_code& ec)
{
if (!threads::get_self_ptr())
{
HPX_THROWS_IF(ec, bad_parameter,
"scheduled_thread_pool<Scheduler>::suspend",
"cannot call suspend from outside HPX, use suspend_cb instead");
return make_ready_future();
}
lcos::local::packaged_task<void(void)> pt([](){});
hpx::future fut = pt.get_future();
suspend_internal(std::move(pt), ec);
return fut;
}
template <typename Scheduler>
void scheduled_thread_pool<Scheduler>::suspend_cb(std::function<void(void)> callback, error_code& ec)
{
suspend_internal(callback, ec);
}
template <typename Scheduler>
void scheduled_thread_pool<Scheduler>::resume(error_code& ec)
{
for (std::size_t i = 0; i != threads_.size(); ++i)
{
resume_processing_unit_internal(i, ec);
}
}
template <typename Scheduler>
void hpx::threads::detail::scheduled_thread_pool<Scheduler>::thread_func(
std::size_t thread_num, std::size_t global_thread_num,
std::shared_ptr<compat::barrier> startup)
{
auto const& rp = resource::get_partitioner();
topology const& topo = rp.get_topology();
// Set the affinity for the current thread.
threads::mask_cref_type mask = rp.get_pu_mask(global_thread_num);
if (LHPX_ENABLED(debug))
topo.write_to_log();
error_code ec(lightweight);
if (any(mask))
{
topo.set_thread_affinity_mask(mask, ec);
if (ec)
{
LTM_(warning) //-V128
<< "thread_func: " << id_.name()
<< " setting thread affinity on OS thread " //-V128
<< global_thread_num
<< " failed with: " << ec.get_message();
}
}
else
{
LTM_(debug) //-V128
<< "thread_func: " << id_.name()
<< " setting thread affinity on OS thread " //-V128
<< global_thread_num << " was explicitly disabled.";
}
// Setting priority of worker threads to a lower priority, this
// needs to
// be done in order to give the parcel pool threads higher
// priority
if (mode_ & policies::reduce_thread_priority)
{
topo.reduce_thread_priority(ec);
if (ec)
{
LTM_(warning) //-V128
<< "thread_func: " << id_.name()
<< " reducing thread priority on OS thread " //-V128
<< global_thread_num
<< " failed with: " << ec.get_message();
}
}
// manage the number of this thread in its TSS
init_tss_helper<Scheduler> tss_helper(
*this, thread_num, this->thread_offset_);
++thread_count_;
// set state to running
std::atomic<hpx::state>& state =
sched_->Scheduler::get_state(thread_num);
hpx::state oldstate = state.exchange(state_running);
HPX_ASSERT(oldstate <= state_running);
// wait for all threads to start up before before starting HPX work
startup->wait();
LTM_(info) //-V128
<< "thread_func: " << id_.name()
<< " starting OS thread: " << thread_num; //-V128
try
{
try
{
manage_active_thread_count count(thread_count_);
// run the work queue
hpx::threads::coroutines::prepare_main_thread main_thread;
// run main Scheduler loop until terminated
detail::scheduling_counters counters(
executed_threads_[thread_num],
executed_thread_phases_[thread_num],
tfunc_times_[thread_num],
exec_times_[thread_num],
idle_loop_counts_[thread_num],
busy_loop_counts_[thread_num],
tasks_active_[thread_num]);
detail::scheduling_callbacks callbacks(
util::bind( //-V107
&policies::scheduler_base::idle_callback,
std::ref(sched_), global_thread_num),
detail::scheduling_callbacks::callback_type());
if (mode_ & policies::do_background_work)
{
callbacks.background_ = util::bind( //-V107
&policies::scheduler_base::background_callback,
std::ref(sched_), global_thread_num);
}
sched_->Scheduler::set_scheduler_mode(mode_);
detail::scheduling_loop(
thread_num, *sched_, counters, callbacks);
// the OS thread is allowed to exit only if no more HPX
// threads exist or if some other thread has terminated
HPX_ASSERT(
(sched_->Scheduler::get_thread_count(
suspended, thread_priority_default, thread_num) == 0 &&
sched_->Scheduler::get_queue_length(thread_num) == 0) ||
sched_->Scheduler::get_state(thread_num) > state_stopping);
}
catch (hpx::exception const& e)
{
LFATAL_ //-V128
<< "thread_func: " << id_.name()
<< " thread_num:" << global_thread_num //-V128
<< " : caught hpx::exception: " << e.what()
<< ", aborted thread execution";
report_error(global_thread_num, std::current_exception());
return;
}
catch (boost::system::system_error const& e)
{
LFATAL_ //-V128
<< "thread_func: " << id_.name()
<< " thread_num:" << global_thread_num //-V128
<< " : caught boost::system::system_error: " << e.what()
<< ", aborted thread execution";
report_error(global_thread_num, std::current_exception());
return;
}
catch (std::exception const& e)
{
// Repackage exceptions to avoid slicing.
hpx::throw_with_info(
hpx::exception(unhandled_exception, e.what()));
}
}
catch (...)
{
LFATAL_ //-V128
<< "thread_func: " << id_.name()
<< " thread_num:" << global_thread_num //-V128
<< " : caught unexpected " //-V128
"exception, aborted thread execution";
report_error(global_thread_num, std::current_exception());
return;
}
LTM_(info) //-V128
<< "thread_func: " << id_.name()
<< " thread_num: " << global_thread_num
<< " : ending OS thread, " //-V128
"executed "
<< executed_threads_[global_thread_num] << " HPX threads";
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
void scheduled_thread_pool<Scheduler>::create_thread(
thread_init_data& data, thread_id_type& id,
thread_state_enum initial_state, bool run_now, error_code& ec)
{
// verify state
if (thread_count_ == 0 && !sched_->Scheduler::is_state(state_running))
{
// thread-manager is not currently running
HPX_THROWS_IF(ec, invalid_status,
"thread_pool<Scheduler>::create_thread",
"invalid state: thread pool is not running");
return;
}
detail::create_thread(
sched_.get(), data, id, initial_state, run_now, ec); //-V601
// update statistics
++tasks_scheduled_;
}
template <typename Scheduler>
void scheduled_thread_pool<Scheduler>::create_work(
thread_init_data& data, thread_state_enum initial_state, error_code& ec)
{
// verify state
if (thread_count_ == 0 && !sched_->Scheduler::is_state(state_running))
{
// thread-manager is not currently running
HPX_THROWS_IF(ec, invalid_status,
"thread_pool<Scheduler>::create_work",
"invalid state: thread pool is not running");
return;
}
detail::create_work(sched_.get(), data, initial_state, ec); //-V601
// update statistics
++tasks_scheduled_;
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
thread_state scheduled_thread_pool<Scheduler>::set_state(
thread_id_type const& id, thread_state_enum new_state,
thread_state_ex_enum new_state_ex, thread_priority priority,
error_code& ec)
{
return detail::set_thread_state(id, new_state, //-V107
new_state_ex, priority, get_worker_thread_num(), ec);
}
template <typename Scheduler>
thread_id_type scheduled_thread_pool<Scheduler>::set_state(
util::steady_time_point const& abs_time, thread_id_type const& id,
thread_state_enum newstate, thread_state_ex_enum newstate_ex,
thread_priority priority, error_code& ec)
{
return detail::set_thread_state_timed(*sched_, abs_time, id, newstate,
newstate_ex, priority, get_worker_thread_num(), ec);
}
///////////////////////////////////////////////////////////////////////////
// performance counters
#if defined(HPX_HAVE_THREAD_CUMULATIVE_COUNTS)
template <typename Scheduler>
std::int64_t scheduled_thread_pool<Scheduler>::get_executed_threads(
std::size_t num, bool reset)
{
std::int64_t executed_threads = 0;
std::int64_t reset_executed_threads = 0;
if (num != std::size_t(-1))
{
executed_threads = executed_threads_[num];
reset_executed_threads = reset_executed_threads_[num];
if (reset)
reset_executed_threads_[num] = executed_threads;
}
else
{
executed_threads = std::accumulate(executed_threads_.begin(),
executed_threads_.end(), std::int64_t(0));
reset_executed_threads =
std::accumulate(reset_executed_threads_.begin(),
reset_executed_threads_.end(), std::int64_t(0));
if (reset)
{
std::copy(executed_threads_.begin(), executed_threads_.end(),
reset_executed_threads_.begin());
}
}
HPX_ASSERT(executed_threads >= reset_executed_threads);
return executed_threads - reset_executed_threads;
}
#endif
template <typename Scheduler>
std::int64_t scheduled_thread_pool<Scheduler>::get_executed_threads() const
{
std::int64_t executed_threads =
std::accumulate(executed_threads_.begin(), executed_threads_.end(),
std::int64_t(0));
#if defined(HPX_HAVE_THREAD_CUMULATIVE_COUNTS)
std::int64_t reset_executed_threads =
std::accumulate(reset_executed_threads_.begin(),
reset_executed_threads_.end(), std::int64_t(0));
HPX_ASSERT(executed_threads >= reset_executed_threads);
return executed_threads - reset_executed_threads;
#else
return executed_threads;
#endif
}
#if defined(HPX_HAVE_THREAD_CUMULATIVE_COUNTS)
template <typename Scheduler>
std::int64_t scheduled_thread_pool<Scheduler>::get_executed_thread_phases(
std::size_t num, bool reset)
{
std::int64_t executed_phases = 0;
std::int64_t reset_executed_phases = 0;
if (num != std::size_t(-1))
{
executed_phases = executed_thread_phases_[num];
reset_executed_phases = reset_executed_thread_phases_[num];
if (reset)
reset_executed_thread_phases_[num] = executed_phases;
}
else
{
executed_phases = std::accumulate(executed_thread_phases_.begin(),
executed_thread_phases_.end(), std::int64_t(0));
reset_executed_phases = std::accumulate(
reset_executed_thread_phases_.begin(),
reset_executed_thread_phases_.end(), std::int64_t(0));
if (reset)
{
std::copy(executed_thread_phases_.begin(),
executed_thread_phases_.end(),
reset_executed_thread_phases_.begin());
}
}
HPX_ASSERT(executed_phases >= reset_executed_phases);
return executed_phases - reset_executed_phases;
}
#endif
#if defined(HPX_HAVE_THREAD_IDLE_RATES)
template <typename Scheduler>
std::int64_t scheduled_thread_pool<Scheduler>::get_thread_phase_duration(
std::size_t num, bool reset)
{
std::uint64_t exec_total = 0ul;
std::int64_t num_phases = 0l;
std::uint64_t reset_exec_total = 0ul;
std::int64_t reset_num_phases = 0l;
if (num != std::size_t(-1))
{
exec_total = exec_times_[num];
num_phases = executed_thread_phases_[num];
reset_exec_total = reset_thread_phase_duration_times_[num];
reset_num_phases = reset_thread_phase_duration_[num];
if (reset)
{
reset_thread_phase_duration_[num] = num_phases;
reset_thread_phase_duration_times_[num] = exec_total;
}
}
else
{
exec_total = std::accumulate(exec_times_.begin(),
exec_times_.end(), std::uint64_t(0));
num_phases = std::accumulate(executed_thread_phases_.begin(),
executed_thread_phases_.end(), std::int64_t(0));
reset_exec_total = std::accumulate(
reset_thread_phase_duration_times_.begin(),
reset_thread_phase_duration_times_.end(), std::uint64_t(0));
reset_num_phases = std::accumulate(
reset_thread_phase_duration_.begin(),
reset_thread_phase_duration_.end(), std::int64_t(0));
if (reset)
{
std::copy(exec_times_.begin(), exec_times_.end(),
reset_thread_phase_duration_times_.begin());
std::copy(executed_thread_phases_.begin(),
executed_thread_phases_.end(),
reset_thread_phase_duration_.begin());
}
}
HPX_ASSERT(exec_total >= reset_exec_total);
HPX_ASSERT(num_phases >= reset_num_phases);
exec_total -= reset_exec_total;
num_phases -= reset_num_phases;
return std::uint64_t(
(double(exec_total) * timestamp_scale_) / double(num_phases)
);
}
template <typename Scheduler>
std::int64_t scheduled_thread_pool<Scheduler>::get_thread_duration(
std::size_t num, bool reset)
{
std::uint64_t exec_total = 0ul;
std::int64_t num_threads = 0l;
std::uint64_t reset_exec_total = 0ul;
std::int64_t reset_num_threads = 0l;
if (num != std::size_t(-1))
{
exec_total = exec_times_[num];
num_threads = executed_threads_[num];
reset_exec_total = reset_thread_duration_times_[num];
reset_num_threads = reset_thread_duration_[num];
if (reset)
{
reset_thread_duration_[num] = num_threads;
reset_thread_duration_times_[num] = exec_total;
}
}
else
{
exec_total = std::accumulate(
exec_times_.begin(), exec_times_.end(), std::uint64_t(0));
num_threads = std::accumulate(executed_threads_.begin(),
executed_threads_.end(), std::int64_t(0));
reset_exec_total =
std::accumulate(reset_thread_duration_times_.begin(),
reset_thread_duration_times_.end(),
std::uint64_t(0));
reset_num_threads = std::accumulate(reset_thread_duration_.begin(),
reset_thread_duration_.end(),
std::int64_t(0));
if (reset)
{
std::copy(exec_times_.begin(), exec_times_.end(),
reset_thread_duration_times_.begin());
std::copy(executed_threads_.begin(),
executed_threads_.end(),
reset_thread_duration_.begin());
}
}
HPX_ASSERT(exec_total >= reset_exec_total);
HPX_ASSERT(num_threads >= reset_num_threads);
exec_total -= reset_exec_total;
num_threads -= reset_num_threads;
return std::uint64_t(
(double(exec_total) * timestamp_scale_) / double(num_threads));
}
template <typename Scheduler>
std::int64_t scheduled_thread_pool<Scheduler>::get_thread_phase_overhead(
std::size_t num, bool reset)
{
std::uint64_t exec_total = 0;
std::uint64_t tfunc_total = 0;
std::int64_t num_phases = 0;
std::uint64_t reset_exec_total = 0;
std::uint64_t reset_tfunc_total = 0;
std::int64_t reset_num_phases = 0;
if (num != std::size_t(-1))
{
exec_total = exec_times_[num];
tfunc_total = tfunc_times_[num];
num_phases = executed_thread_phases_[num];
reset_exec_total = reset_thread_phase_overhead_times_[num];
reset_tfunc_total = reset_thread_phase_overhead_times_total_[num];
reset_num_phases = reset_thread_phase_overhead_[num];
if (reset)
{
reset_thread_phase_overhead_times_[num] = exec_total;
reset_thread_phase_overhead_times_total_[num] = tfunc_total;
reset_thread_phase_overhead_[num] = num_phases;
}
}
else
{
exec_total = std::accumulate(
exec_times_.begin(), exec_times_.end(), std::uint64_t(0));
tfunc_total = std::accumulate(
tfunc_times_.begin(), tfunc_times_.end(), std::uint64_t(0));
num_phases = std::accumulate(executed_thread_phases_.begin(),
executed_thread_phases_.end(), std::int64_t(0));
reset_exec_total =
std::accumulate(reset_thread_phase_overhead_times_.begin(),
reset_thread_phase_overhead_times_.end(), std::uint64_t(0));
reset_tfunc_total = std::accumulate(
reset_thread_phase_overhead_times_total_.begin(),
reset_thread_phase_overhead_times_total_.end(),
std::uint64_t(0));
reset_num_phases =
std::accumulate(reset_thread_phase_overhead_.begin(),
reset_thread_phase_overhead_.end(), std::int64_t(0));
if (reset)
{
std::copy(exec_times_.begin(), exec_times_.end(),
reset_thread_phase_overhead_times_.begin());
std::copy(tfunc_times_.begin(), tfunc_times_.end(),
reset_thread_phase_overhead_times_total_.begin());
std::copy(executed_thread_phases_.begin(),
executed_thread_phases_.end(),
reset_thread_phase_overhead_.begin());
}
}
HPX_ASSERT(exec_total >= reset_exec_total);
HPX_ASSERT(tfunc_total >= reset_tfunc_total);
HPX_ASSERT(num_phases >= reset_num_phases);
exec_total -= reset_exec_total;
tfunc_total -= reset_tfunc_total;
num_phases -= reset_num_phases;
if (num_phases == 0) // avoid division by zero
return 0;
HPX_ASSERT(tfunc_total >= exec_total);
return std::uint64_t(
double((tfunc_total - exec_total) * timestamp_scale_) /
double(num_phases));
}
template <typename Scheduler>
std::int64_t scheduled_thread_pool<Scheduler>::get_thread_overhead(
std::size_t num, bool reset)
{
std::uint64_t exec_total = 0;
std::uint64_t tfunc_total = 0;
std::int64_t num_threads = 0;
std::uint64_t reset_exec_total = 0;
std::uint64_t reset_tfunc_total = 0;
std::int64_t reset_num_threads = 0;
if (num != std::size_t(-1))
{
exec_total = exec_times_[num];
tfunc_total = tfunc_times_[num];
num_threads = executed_threads_[num];
reset_exec_total = reset_thread_overhead_times_[num];
reset_tfunc_total = reset_thread_overhead_times_total_[num];
reset_num_threads = reset_thread_overhead_[num];
if (reset)
{
reset_thread_overhead_times_[num] = exec_total;
reset_thread_overhead_times_total_[num] = tfunc_total;
reset_thread_overhead_[num] = num_threads;
}
}
else
{
exec_total = std::accumulate(
exec_times_.begin(), exec_times_.end(), std::uint64_t(0));
tfunc_total = std::accumulate(
tfunc_times_.begin(), tfunc_times_.end(), std::uint64_t(0));
num_threads = std::accumulate(executed_threads_.begin(),
executed_threads_.end(), std::int64_t(0));
reset_exec_total =
std::accumulate(reset_thread_overhead_times_.begin(),
reset_thread_overhead_times_.end(), std::uint64_t(0));
reset_tfunc_total =
std::accumulate(reset_thread_overhead_times_total_.begin(),
reset_thread_overhead_times_total_.end(),
std::uint64_t(0));
reset_num_threads = std::accumulate(reset_thread_overhead_.begin(),
reset_thread_overhead_.end(), std::int64_t(0));
if (reset)
{
std::copy(exec_times_.begin(), exec_times_.end(),
reset_thread_overhead_times_.begin());
std::copy(tfunc_times_.begin(), tfunc_times_.end(),
reset_thread_overhead_times_total_.begin());
std::copy(executed_threads_.begin(),
executed_threads_.end(),
reset_thread_overhead_.begin());
}
}
HPX_ASSERT(exec_total >= reset_exec_total);
HPX_ASSERT(tfunc_total >= reset_tfunc_total);
HPX_ASSERT(num_threads >= reset_num_threads);
exec_total -= reset_exec_total;
tfunc_total -= reset_tfunc_total;
num_threads -= reset_num_threads;
if (num_threads == 0) // avoid division by zero
return 0;
HPX_ASSERT(tfunc_total >= exec_total);
return std::uint64_t(
double((tfunc_total - exec_total) * timestamp_scale_) /
double(num_threads));
}