/
thread_pool.cpp
1463 lines (1236 loc) · 51.3 KB
/
thread_pool.cpp
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// Copyright (c) 2007-2015 Hartmut Kaiser
//
// 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)
#include <hpx/runtime/threads/detail/thread_pool.hpp>
#include <hpx/error_code.hpp>
#include <hpx/exception.hpp>
#include <hpx/state.hpp>
#include <hpx/throw_exception.hpp>
#include <hpx/lcos/local/no_mutex.hpp>
#include <hpx/runtime/get_worker_thread_num.hpp>
#include <hpx/runtime/threads/detail/create_thread.hpp>
#include <hpx/runtime/threads/detail/create_work.hpp>
#include <hpx/runtime/threads/detail/scheduling_loop.hpp>
#include <hpx/runtime/threads/detail/set_thread_state.hpp>
#include <hpx/runtime/threads/detail/thread_num_tss.hpp>
#include <hpx/runtime/threads/policies/callback_notifier.hpp>
#include <hpx/runtime/threads/topology.hpp>
#include <hpx/util/assert.hpp>
#include <hpx/util/bind.hpp>
#include <hpx/util/logging.hpp>
#include <hpx/util/hardware/timestamp.hpp>
#include <hpx/util/high_resolution_clock.hpp>
#include <hpx/util/unlock_guard.hpp>
#include <boost/atomic.hpp>
#include <boost/exception_ptr.hpp>
#include <boost/system/system_error.hpp>
#include <boost/thread/barrier.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <exception>
#include <functional>
#include <iomanip>
#include <mutex>
#include <numeric>
namespace hpx { namespace threads { namespace detail
{
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
void thread_pool<Scheduler>::init_tss(std::size_t num)
{
thread_num_tss_.init_tss(num);
}
template <typename Scheduler>
void thread_pool<Scheduler>::deinit_tss()
{
thread_num_tss_.deinit_tss();
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
thread_pool<Scheduler>::thread_pool(Scheduler& sched,
threads::policies::callback_notifier& notifier,
char const* pool_name, policies::scheduler_mode m)
: sched_(sched),
notifier_(notifier),
pool_name_(pool_name),
thread_count_(0),
used_processing_units_(),
mode_(m)
{
timestamp_scale_ = 1.0;
}
template <typename Scheduler>
thread_pool<Scheduler>::~thread_pool()
{
if (!threads_.empty()) {
if (!sched_.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>
hpx::state 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_.get_minmax_state().second;
}
template <typename Scheduler>
hpx::state thread_pool<Scheduler>::get_state(std::size_t num_thread) const
{
HPX_ASSERT(num_thread != std::size_t(-1));
return sched_.get_state(num_thread).load();
}
template <typename Scheduler>
bool thread_pool<Scheduler>::has_reached_state(hpx::state s) const
{
return sched_.has_reached_state(s);
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
std::size_t thread_pool<Scheduler>::init(std::size_t num_threads,
policies::init_affinity_data const& data)
{
topology const& topology_ = get_topology();
std::size_t cores_used = sched_.Scheduler::init(data, topology_);
resize(used_processing_units_, threads::hardware_concurrency());
for (std::size_t i = 0; i != num_threads; ++i)
used_processing_units_ |= sched_.Scheduler::get_pu_mask(topology_, i);
return cores_used;
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
std::size_t thread_pool<Scheduler>::get_pu_num(std::size_t num_thread) const
{
return sched_.Scheduler::get_pu_num(num_thread);
}
template <typename Scheduler>
mask_cref_type thread_pool<Scheduler>::get_pu_mask(
topology const& topology, std::size_t num_thread) const
{
return sched_.Scheduler::get_pu_mask(topology, num_thread);
}
template <typename Scheduler>
mask_cref_type thread_pool<Scheduler>::get_used_processing_units() const
{
return used_processing_units_;
}
template <typename Scheduler>
void thread_pool<Scheduler>::do_some_work(std::size_t num_thread)
{
sched_.Scheduler::do_some_work(num_thread);
}
template <typename Scheduler>
void thread_pool<Scheduler>::report_error(std::size_t num,
boost::exception_ptr const& e)
{
sched_.set_all_states(state_terminating);
notifier_.on_error(num, e);
sched_.Scheduler::on_error(num, e);
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
void 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_.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_, data, id, initial_state, run_now, ec); //-V601
}
template <typename Scheduler>
void thread_pool<Scheduler>::create_work(thread_init_data& data,
thread_state_enum initial_state, error_code& ec)
{
// verify state
if (thread_count_ == 0 && !sched_.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_, data, initial_state, ec); //-V601
}
template <typename Scheduler>
thread_state 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 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);
}
template <typename Scheduler>
void thread_pool<Scheduler>::abort_all_suspended_threads()
{
sched_.Scheduler::abort_all_suspended_threads();
}
template <typename Scheduler>
bool thread_pool<Scheduler>::cleanup_terminated(bool delete_all)
{
return sched_.Scheduler::cleanup_terminated(delete_all);
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
std::size_t thread_pool<Scheduler>::get_worker_thread_num() const
{
return thread_num_tss_.get_worker_thread_num();
}
template <typename Scheduler>
boost::thread& thread_pool<Scheduler>::get_os_thread_handle(
std::size_t num_thread)
{
HPX_ASSERT(num_thread < threads_.size());
return threads_[threads_.size() - num_thread - 1];
}
template <typename Scheduler>
std::int64_t thread_pool<Scheduler>::get_thread_count(
thread_state_enum state, thread_priority priority,
std::size_t num, bool reset) const
{
return sched_.Scheduler::get_thread_count(state, priority, num, reset);
}
template <typename Scheduler>
std::int64_t thread_pool<Scheduler>::get_scheduler_utilization() const
{
return (std::accumulate(tasks_active_.begin(), tasks_active_.end(),
std::int64_t(0)) * 100) / thread_count_.load();
}
template <typename Scheduler>
bool thread_pool<Scheduler>::enumerate_threads(
util::function_nonser<bool(thread_id_type)> const& f,
thread_state_enum state) const
{
return sched_.Scheduler::enumerate_threads(f, state);
}
template <typename Scheduler>
void thread_pool<Scheduler>::reset_thread_distribution()
{
return sched_.Scheduler::reset_thread_distribution();
}
template <typename Scheduler>
void thread_pool<Scheduler>::set_scheduler_mode(
threads::policies::scheduler_mode mode)
{
return sched_.set_scheduler_mode(mode);
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
bool thread_pool<Scheduler>::run(std::unique_lock<boost::mutex>& l,
std::size_t num_threads)
{
HPX_ASSERT(l.owns_lock());
LTM_(info) //-V128
<< "thread_pool::run: " << pool_name_
<< " number of processing units available: " //-V128
<< threads::hardware_concurrency();
LTM_(info) //-V128
<< "thread_pool::run: " << pool_name_
<< " creating " << num_threads << " OS thread(s)"; //-V128
if (0 == num_threads) {
HPX_THROW_EXCEPTION(bad_parameter,
"thread_pool::run", "number of threads is zero");
}
if (!threads_.empty() || sched_.has_reached_state(state_running))
return true; // do nothing if already running
executed_threads_.resize(num_threads);
executed_thread_phases_.resize(num_threads);
tfunc_times_.resize(num_threads);
exec_times_.resize(num_threads);
reset_tfunc_times_.resize(num_threads);
tasks_active_.resize(num_threads);
// scale timestamps to nanoseconds
std::uint64_t base_timestamp = util::hardware::timestamp();
std::uint64_t base_time = util::high_resolution_clock::now();
std::uint64_t curr_timestamp = util::hardware::timestamp();
std::uint64_t curr_time = util::high_resolution_clock::now();
while ((curr_time - base_time) <= 100000)
{
curr_timestamp = util::hardware::timestamp();
curr_time = util::high_resolution_clock::now();
}
if (curr_timestamp - base_timestamp != 0)
{
timestamp_scale_ = double(curr_time - base_time) /
double(curr_timestamp - base_timestamp);
}
#if defined(HPX_HAVE_THREAD_CUMULATIVE_COUNTS)
// timestamps/values of last reset operation for various performance
// counters
reset_executed_threads_.resize(num_threads);
reset_executed_thread_phases_.resize(num_threads);
#if defined(HPX_HAVE_THREAD_IDLE_RATES)
// timestamps/values of last reset operation for various performance
// counters
reset_thread_duration_.resize(num_threads);
reset_thread_duration_times_.resize(num_threads);
reset_thread_overhead_.resize(num_threads);
reset_thread_overhead_times_.resize(num_threads);
reset_thread_overhead_times_total_.resize(num_threads);
reset_thread_phase_duration_.resize(num_threads);
reset_thread_phase_duration_times_.resize(num_threads);
reset_thread_phase_overhead_.resize(num_threads);
reset_thread_phase_overhead_times_.resize(num_threads);
reset_thread_phase_overhead_times_total_.resize(num_threads);
reset_cumulative_thread_duration_.resize(num_threads);
reset_cumulative_thread_overhead_.resize(num_threads);
reset_cumulative_thread_overhead_total_.resize(num_threads);
#endif
#endif
#if defined(HPX_HAVE_THREAD_IDLE_RATES)
reset_idle_rate_time_.resize(num_threads);
reset_idle_rate_time_total_.resize(num_threads);
#if defined(HPX_HAVE_THREAD_CREATION_AND_CLEANUP_RATES)
reset_creation_idle_rate_time_.resize(num_threads);
reset_creation_idle_rate_time_total_.resize(num_threads);
reset_cleanup_idle_rate_time_.resize(num_threads);
reset_cleanup_idle_rate_time_total_.resize(num_threads);
#endif
#endif
LTM_(info)
<< "thread_pool::run: " << pool_name_
<< " timestamp_scale: " << timestamp_scale_; //-V128
try {
HPX_ASSERT(startup_.get() == nullptr);
startup_.reset(
new boost::barrier(static_cast<unsigned>(num_threads+1))
);
// run threads and wait for initialization to complete
topology const& topology_ = get_topology();
std::size_t thread_num = num_threads;
while (thread_num-- != 0) {
threads::mask_cref_type mask =
sched_.Scheduler::get_pu_mask(topology_, thread_num);
LTM_(info) //-V128
<< "thread_pool::run: " << pool_name_
<< " create OS thread " << thread_num //-V128
<< ": will run on processing units within this mask: "
#if !defined(HPX_HAVE_MORE_THAN_64_THREADS) || \
(defined(HPX_HAVE_MAX_CPU_COUNT) && HPX_HAVE_MAX_CPU_COUNT <= 64)
<< std::hex << "0x" << mask;
#else
<< "0b" << mask;
#endif
// create a new thread
threads_.push_back(boost::thread(
&thread_pool::thread_func, this, thread_num,
std::ref(topology_), std::ref(*startup_)
));
// set the new threads affinity (on Windows systems)
if (any(mask))
{
error_code ec(lightweight);
topology_.set_thread_affinity_mask(threads_.back(), mask, ec);
if (ec)
{
LTM_(warning) //-V128
<< "thread_pool::run: " << pool_name_
<< " setting thread affinity on OS thread " //-V128
<< thread_num << " failed with: "
<< ec.get_message();
}
}
else
{
LTM_(debug) //-V128
<< "thread_pool::run: " << pool_name_
<< " setting thread affinity on OS thread " //-V128
<< thread_num << " was explicitly disabled.";
}
}
// the main thread needs to have a unique thread_num
init_tss(num_threads);
startup_->wait();
// The scheduler is now running.
sched_.set_all_states(state_running);
}
catch (std::exception const& e) {
LTM_(always)
<< "thread_pool::run: " << pool_name_
<< " failed with: " << e.what();
// trigger the barrier
if (startup_.get() != nullptr)
{
while (num_threads-- != 0 && !startup_->wait())
;
}
stop(l);
threads_.clear();
return false;
}
LTM_(info) << "thread_pool::run: " << pool_name_ << " running";
return true;
}
///////////////////////////////////////////////////////////////////////////
template <typename Scheduler>
void thread_pool<Scheduler>::stop (
std::unique_lock<boost::mutex>& l, bool blocking)
{
HPX_ASSERT(l.owns_lock());
return stop_locked(l, blocking);
}
template <typename Scheduler>
template <typename Lock>
void thread_pool<Scheduler>::stop_locked(Lock& l, bool blocking)
{
LTM_(info)
<< "thread_pool::stop: " << pool_name_
<< " blocking(" << std::boolalpha << blocking << ")";
deinit_tss();
if (!threads_.empty()) {
// set state to stopping
sched_.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)
{
// make sure no OS thread is waiting
LTM_(info)
<< "thread_pool::stop: " << pool_name_
<< " notify_all";
sched_.Scheduler::do_some_work(std::size_t(-1));
LTM_(info) //-V128
<< "thread_pool::stop: " << pool_name_
<< " join:" << i; //-V128
// unlock the lock while joining
util::unlock_guard<Lock> ul(l);
threads_[i].join();
}
threads_.clear();
}
}
}
///////////////////////////////////////////////////////////////////////////
struct manage_active_thread_count
{
manage_active_thread_count(boost::atomic<long>& counter)
: counter_(counter)
{
++counter_;
}
~manage_active_thread_count()
{
--counter_;
}
boost::atomic<long>& counter_;
};
template <typename Scheduler>
struct init_tss_helper
{
init_tss_helper(thread_pool<Scheduler>& pool, std::size_t thread_num)
: pool_(pool), thread_num_(thread_num)
{
pool.notifier_.on_start_thread(thread_num);
pool.init_tss(thread_num);
pool.sched_.Scheduler::on_start_thread(thread_num);
}
~init_tss_helper()
{
pool_.sched_.Scheduler::on_stop_thread(thread_num_);
pool_.deinit_tss();
pool_.notifier_.on_stop_thread(thread_num_);
}
thread_pool<Scheduler>& pool_;
std::size_t thread_num_;
};
template <typename Scheduler>
void thread_pool<Scheduler>::thread_func(std::size_t num_thread,
topology const& topology, boost::barrier& startup)
{
// Set the affinity for the current thread.
threads::mask_cref_type mask =
sched_.Scheduler::get_pu_mask(topology, num_thread);
if (LHPX_ENABLED(debug))
topology.write_to_log();
error_code ec(lightweight);
if (any(mask))
{
topology.set_thread_affinity_mask(mask, ec);
if (ec)
{
LTM_(warning) //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " setting thread affinity on OS thread " //-V128
<< num_thread << " failed with: " << ec.get_message();
}
}
else
{
LTM_(debug) //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " setting thread affinity on OS thread " //-V128
<< num_thread << " 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) &&
any(mask & used_processing_units_))
{
topology.reduce_thread_priority(ec);
if (ec)
{
LTM_(warning) //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " reducing thread priority on OS thread " //-V128
<< num_thread << " failed with: " << ec.get_message();
}
}
// manage the number of this thread in its TSS
init_tss_helper<Scheduler> tss_helper(*this, num_thread);
// wait for all threads to start up before before starting HPX work
startup.wait();
{
LTM_(info) //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " starting OS thread: " << num_thread; //-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_[num_thread],
executed_thread_phases_[num_thread],
tfunc_times_[num_thread], exec_times_[num_thread],
tasks_active_[num_thread]);
detail::scheduling_callbacks callbacks(
util::bind( //-V107
&policies::scheduler_base::idle_callback,
&sched_, num_thread
),
detail::scheduling_callbacks::callback_type());
if (mode_ & policies::do_background_work)
{
callbacks.background_ = util::bind( //-V107
&policies::scheduler_base::background_callback,
&sched_, num_thread);
}
sched_.set_scheduler_mode(mode_);
detail::scheduling_loop(num_thread, 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(
unknown, thread_priority_default, num_thread) ||
sched_.get_state(num_thread) == state_terminating);
}
catch (hpx::exception const& e) {
LFATAL_ //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " thread_num:" << num_thread //-V128
<< " : caught hpx::exception: "
<< e.what() << ", aborted thread execution";
report_error(num_thread, boost::current_exception());
return;
}
catch (boost::system::system_error const& e) {
LFATAL_ //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " thread_num:" << num_thread //-V128
<< " : caught boost::system::system_error: "
<< e.what() << ", aborted thread execution";
report_error(num_thread, boost::current_exception());
return;
}
catch (std::exception const& e) {
// Repackage exceptions to avoid slicing.
boost::throw_exception(boost::enable_error_info(
hpx::exception(unhandled_exception, e.what())));
}
}
catch (...) {
LFATAL_ //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " thread_num:" << num_thread //-V128
<< " : caught unexpected " //-V128
"exception, aborted thread execution";
report_error(num_thread, boost::current_exception());
return;
}
LTM_(info) //-V128
<< "thread_pool::thread_func: " << pool_name_
<< " thread_num: " << num_thread
<< " : ending OS thread, " //-V128
"executed " << executed_threads_[num_thread]
<< " HPX threads";
}
}
///////////////////////////////////////////////////////////////////////////
// performance counters
#if defined(HPX_HAVE_THREAD_CUMULATIVE_COUNTS)
template <typename Scheduler>
std::int64_t 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;
}
template <typename Scheduler>
std::int64_t 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;
}
#if defined(HPX_HAVE_THREAD_IDLE_RATES)
template <typename Scheduler>
std::int64_t 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 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 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 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;
}
}