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// Copyright 2022 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "VideoCommon/PerformanceTracker.h"
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <utility>
#include <implot.h>
#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Common/MathUtil.h"
#include "VideoCommon/VideoConfig.h"
static constexpr double SAMPLE_RC_RATIO = 0.25;
static constexpr u64 MAX_DT_QUEUE_SIZE = 1UL << 12;
static constexpr u64 MAX_QUALITY_GRAPH_SIZE = 1UL << 8;
PerformanceTracker::PerformanceTracker(std::optional<std::string> log_name,
const std::optional<DT> sample_window_duration)
: m_log_name{std::move(log_name)}, m_sample_window_duration{sample_window_duration}
{
Reset();
}
void PerformanceTracker::Reset()
{
m_raw_dts.Clear();
m_dt_queue.clear();
m_dt_total = DT::zero();
m_last_raw_dt = DT::zero();
m_last_time = Clock::now();
m_hz_avg = 0.0;
m_dt_avg = DT::zero();
m_dt_std = DT::zero();
m_is_last_time_sane = false;
}
void PerformanceTracker::Count()
{
const TimePoint current_time{Clock::now()};
const DT diff{current_time - m_last_time};
m_last_time = current_time;
if (!m_is_last_time_sane)
{
m_is_last_time_sane = true;
return;
}
m_last_raw_dt = diff;
m_raw_dts.Push(diff);
}
void PerformanceTracker::UpdateStats()
{
DT diff{};
while (m_raw_dts.Pop(diff))
HandleRawDt(diff);
// Update Std Dev
MathUtil::RunningVariance<double> variance;
for (auto dt : m_dt_queue)
variance.Push(DT_s(dt).count());
m_dt_std = std::chrono::duration_cast<DT>(DT_s(variance.PopulationStandardDeviation()));
}
void PerformanceTracker::HandleRawDt(DT diff)
{
if (m_dt_queue.size() == MAX_DT_QUEUE_SIZE)
PopBack();
PushFront(diff);
const DT window{GetSampleWindow()};
while (m_dt_total - m_dt_queue.back() >= window)
PopBack();
// Simple Moving Average Throughout the Window
const DT dt_avg = m_dt_total / m_dt_queue.size();
const double hz = DT_s(1.0) / dt_avg;
m_dt_avg = dt_avg;
// Exponential Moving Average
const DT_s rc = SAMPLE_RC_RATIO * std::min(window, m_dt_total);
const double a = 1.0 - std::exp(-(DT_s(diff) / rc));
// Sometimes euler averages can break when the average is inf/nan
const auto hz_avg = m_hz_avg.load();
if (std::isfinite(hz_avg))
m_hz_avg = hz_avg + a * (hz - hz_avg);
else
m_hz_avg = hz;
LogRenderTimeToFile(diff);
}
DT PerformanceTracker::GetSampleWindow() const
{
return m_sample_window_duration.value_or(
duration_cast<DT>(DT_us{std::max(1, g_ActiveConfig.iPerfSampleUSec)}));
}
double PerformanceTracker::GetHzAvg() const
{
return m_hz_avg;
}
DT PerformanceTracker::GetDtAvg() const
{
return m_dt_avg;
}
DT PerformanceTracker::GetDtStd() const
{
return m_dt_std;
}
DT PerformanceTracker::GetLastRawDt() const
{
return m_last_raw_dt;
}
void PerformanceTracker::InvalidateLastTime()
{
m_is_last_time_sane = false;
}
void PerformanceTracker::ImPlotPlotLines(const char* label) const
{
// "quality" graph uses twice as many points.
static_assert(MAX_QUALITY_GRAPH_SIZE * 2 <= MAX_DT_QUEUE_SIZE);
static std::array<float, MAX_DT_QUEUE_SIZE + 1> x, y;
if (m_dt_queue.empty())
return;
// Decides if there are too many points to plot using rectangles
const bool quality = m_dt_queue.size() < MAX_QUALITY_GRAPH_SIZE;
std::size_t point_index = 0;
const auto add_point = [&](DT dt, DT shift_x, float prev_ms) {
const float ms = DT_ms{dt}.count();
if (quality)
{
x[point_index] = prev_ms;
y[point_index] = ms;
++point_index;
}
x[point_index] = prev_ms + DT_ms{shift_x}.count();
y[point_index] = ms;
++point_index;
};
// Rightmost point.
const auto update_time = Clock::now() - m_last_time;
const auto predicted_frame_time = std::max(update_time, m_dt_queue.front());
add_point(predicted_frame_time, DT{}, 0);
// Other points, right to left.
for (auto dt : m_dt_queue)
add_point(dt, dt, x[point_index - 1]);
ImPlot::PlotLine(label, x.data(), y.data(), static_cast<int>(point_index));
}
void PerformanceTracker::PushFront(DT value)
{
m_dt_queue.push_front(value);
m_dt_total += value;
}
void PerformanceTracker::PopBack()
{
m_dt_total -= m_dt_queue.back();
m_dt_queue.pop_back();
}
void PerformanceTracker::LogRenderTimeToFile(DT val)
{
if (!m_log_name || !g_ActiveConfig.bLogRenderTimeToFile)
return;
if (!m_bench_file.is_open())
{
File::OpenFStream(m_bench_file, File::GetUserPath(D_LOGS_IDX) + *m_log_name,
std::ios_base::out);
}
m_bench_file << std::fixed << std::setprecision(8) << DT_ms(val).count() << std::endl;
}
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