From 3ad7eec9de119afa6f5ca2db073070a8cdf62f69 Mon Sep 17 00:00:00 2001 From: Merry Date: Wed, 13 Sep 2023 22:49:41 +0100 Subject: core_timing: Use a fibonacci heap --- src/core/core_timing.cpp | 56 +++++++++++++++++++++++++----------------------- src/core/core_timing.h | 12 +++++------ 2 files changed, 35 insertions(+), 33 deletions(-) (limited to 'src') diff --git a/src/core/core_timing.cpp b/src/core/core_timing.cpp index b98a0cb33..65f0df115 100644 --- a/src/core/core_timing.cpp +++ b/src/core/core_timing.cpp @@ -32,6 +32,7 @@ struct CoreTiming::Event { std::uintptr_t user_data; std::weak_ptr type; s64 reschedule_time; + heap_t::handle_type handle{}; // Sort by time, unless the times are the same, in which case sort by // the order added to the queue @@ -122,9 +123,9 @@ void CoreTiming::ScheduleEvent(std::chrono::nanoseconds ns_into_future, std::scoped_lock scope{basic_lock}; const auto next_time{absolute_time ? ns_into_future : GetGlobalTimeNs() + ns_into_future}; - event_queue.emplace_back( - Event{next_time.count(), event_fifo_id++, user_data, event_type, 0}); - std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>()); + auto h{event_queue.emplace( + Event{next_time.count(), event_fifo_id++, user_data, event_type, 0})}; + (*h).handle = h; } event.Set(); @@ -138,10 +139,9 @@ void CoreTiming::ScheduleLoopingEvent(std::chrono::nanoseconds start_time, std::scoped_lock scope{basic_lock}; const auto next_time{absolute_time ? start_time : GetGlobalTimeNs() + start_time}; - event_queue.emplace_back( - Event{next_time.count(), event_fifo_id++, user_data, event_type, resched_time.count()}); - - std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>()); + auto h{event_queue.emplace(Event{next_time.count(), event_fifo_id++, user_data, event_type, + resched_time.count()})}; + (*h).handle = h; } event.Set(); @@ -151,15 +151,17 @@ void CoreTiming::UnscheduleEvent(const std::shared_ptr& event_type, std::uintptr_t user_data, bool wait) { { std::scoped_lock lk{basic_lock}; - const auto itr = - std::remove_if(event_queue.begin(), event_queue.end(), [&](const Event& e) { - return e.type.lock().get() == event_type.get() && e.user_data == user_data; - }); - - // Removing random items breaks the invariant so we have to re-establish it. - if (itr != event_queue.end()) { - event_queue.erase(itr, event_queue.end()); - std::make_heap(event_queue.begin(), event_queue.end(), std::greater<>()); + + std::vector to_remove; + for (auto itr = event_queue.begin(); itr != event_queue.end(); itr++) { + const Event& e = *itr; + if (e.type.lock().get() == event_type.get() && e.user_data == user_data) { + to_remove.push_back(itr->handle); + } + } + + for (auto h : to_remove) { + event_queue.erase(h); } } @@ -200,10 +202,9 @@ std::optional CoreTiming::Advance() { std::scoped_lock lock{advance_lock, basic_lock}; global_timer = GetGlobalTimeNs().count(); - while (!event_queue.empty() && event_queue.front().time <= global_timer) { - Event evt = std::move(event_queue.front()); - std::pop_heap(event_queue.begin(), event_queue.end(), std::greater<>()); - event_queue.pop_back(); + while (!event_queue.empty() && event_queue.top().time <= global_timer) { + Event evt = event_queue.top(); + event_queue.pop(); if (const auto event_type{evt.type.lock()}) { basic_lock.unlock(); @@ -219,16 +220,16 @@ std::optional CoreTiming::Advance() { ? new_schedule_time.value().count() : evt.reschedule_time}; - // If this event was scheduled into a pause, its time now is going to be way behind. - // Re-set this event to continue from the end of the pause. + // If this event was scheduled into a pause, its time now is going to be way + // behind. Re-set this event to continue from the end of the pause. auto next_time{evt.time + next_schedule_time}; if (evt.time < pause_end_time) { next_time = pause_end_time + next_schedule_time; } - event_queue.emplace_back( - Event{next_time, event_fifo_id++, evt.user_data, evt.type, next_schedule_time}); - std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>()); + auto h{event_queue.emplace(Event{next_time, event_fifo_id++, evt.user_data, + evt.type, next_schedule_time})}; + (*h).handle = h; } } @@ -236,7 +237,7 @@ std::optional CoreTiming::Advance() { } if (!event_queue.empty()) { - return event_queue.front().time; + return event_queue.top().time; } else { return std::nullopt; } @@ -274,7 +275,8 @@ void CoreTiming::ThreadLoop() { #endif } } else { - // Queue is empty, wait until another event is scheduled and signals us to continue. + // Queue is empty, wait until another event is scheduled and signals us to + // continue. wait_set = true; event.Wait(); } diff --git a/src/core/core_timing.h b/src/core/core_timing.h index c20e906fb..26a8b93a7 100644 --- a/src/core/core_timing.h +++ b/src/core/core_timing.h @@ -11,7 +11,8 @@ #include #include #include -#include + +#include #include "common/common_types.h" #include "common/thread.h" @@ -151,11 +152,10 @@ private: s64 timer_resolution_ns; #endif - // The queue is a min-heap using std::make_heap/push_heap/pop_heap. - // We don't use std::priority_queue because we need to be able to serialize, unserialize and - // erase arbitrary events (RemoveEvent()) regardless of the queue order. These aren't - // accommodated by the standard adaptor class. - std::vector event_queue; + using heap_t = + boost::heap::fibonacci_heap>>; + + heap_t event_queue; u64 event_fifo_id = 0; std::shared_ptr ev_lost; -- cgit v1.2.3 From f70bafff1a97eb363a81666d187593584b9b7fe7 Mon Sep 17 00:00:00 2001 From: Merry Date: Wed, 13 Sep 2023 22:55:54 +0100 Subject: core_timing: Attempt to reduce heap sifting --- src/core/core_timing.cpp | 33 ++++++++++++++++++++++----------- 1 file changed, 22 insertions(+), 11 deletions(-) (limited to 'src') diff --git a/src/core/core_timing.cpp b/src/core/core_timing.cpp index 65f0df115..e671b270f 100644 --- a/src/core/core_timing.cpp +++ b/src/core/core_timing.cpp @@ -203,19 +203,31 @@ std::optional CoreTiming::Advance() { global_timer = GetGlobalTimeNs().count(); while (!event_queue.empty() && event_queue.top().time <= global_timer) { - Event evt = event_queue.top(); - event_queue.pop(); + const Event& evt = event_queue.top(); if (const auto event_type{evt.type.lock()}) { - basic_lock.unlock(); + if (evt.reschedule_time == 0) { + const auto evt_user_data = evt.user_data; + const auto evt_time = evt.time; - const auto new_schedule_time{event_type->callback( - evt.user_data, evt.time, - std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt.time})}; + event_queue.pop(); - basic_lock.lock(); + basic_lock.unlock(); + + event_type->callback( + evt_user_data, evt_time, + std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt_time}); + + basic_lock.lock(); + } else { + basic_lock.unlock(); + + const auto new_schedule_time{event_type->callback( + evt.user_data, evt.time, + std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt.time})}; + + basic_lock.lock(); - if (evt.reschedule_time != 0) { const auto next_schedule_time{new_schedule_time.has_value() ? new_schedule_time.value().count() : evt.reschedule_time}; @@ -227,9 +239,8 @@ std::optional CoreTiming::Advance() { next_time = pause_end_time + next_schedule_time; } - auto h{event_queue.emplace(Event{next_time, event_fifo_id++, evt.user_data, - evt.type, next_schedule_time})}; - (*h).handle = h; + event_queue.update(evt.handle, Event{next_time, event_fifo_id++, evt.user_data, + evt.type, next_schedule_time, evt.handle}); } } -- cgit v1.2.3