dolphin/Source/Core/Common/Profiler.cpp

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// Copyright 2014 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <algorithm>
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#include <cmath>
#include <cstdio>
#include <cstring>
#include <iomanip>
#include <ios>
#include <sstream>
#include "Common/Profiler.h"
#include "Common/Timer.h"
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namespace Common
{
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static const u32 PROFILER_FIELD_LENGTH = 8;
static const u32 PROFILER_FIELD_LENGTH_FP = PROFILER_FIELD_LENGTH + 3;
static const int PROFILER_LAZY_DELAY = 60; // in frames
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std::list<Profiler*> Profiler::s_all_profilers;
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std::mutex Profiler::s_mutex;
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u32 Profiler::s_max_length = 0;
u64 Profiler::s_frame_time;
u64 Profiler::s_usecs_frame;
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std::string Profiler::s_lazy_result;
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int Profiler::s_lazy_delay = 0;
Profiler::Profiler(const std::string& name)
: m_name(name), m_usecs(0), m_usecs_min(UINT64_MAX), m_usecs_max(0), m_usecs_quad(0),
m_calls(0), m_depth(0)
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{
m_time = Common::Timer::GetTimeUs();
s_max_length = std::max<u32>(s_max_length, u32(m_name.length()));
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std::lock_guard<std::mutex> lk(s_mutex);
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s_all_profilers.push_back(this);
}
Profiler::~Profiler()
{
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std::lock_guard<std::mutex> lk(s_mutex);
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s_all_profilers.remove(this);
}
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bool Profiler::operator<(const Profiler& b) const
{
return m_usecs < b.m_usecs;
}
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std::string Profiler::ToString()
{
if (s_lazy_delay > 0)
{
s_lazy_delay--;
return s_lazy_result;
}
s_lazy_delay = PROFILER_LAZY_DELAY - 1;
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// don't write anything if no profilation is enabled
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std::lock_guard<std::mutex> lk(s_mutex);
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if (s_all_profilers.empty())
return "";
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u64 end = Common::Timer::GetTimeUs();
s_usecs_frame = end - s_frame_time;
s_frame_time = end;
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std::ostringstream buffer;
buffer << std::setw(s_max_length) << std::left << ""
<< " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << "calls"
<< " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << "sum"
<< " ";
buffer << std::setw(PROFILER_FIELD_LENGTH_FP) << std::right << "rel"
<< " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << "min"
<< " ";
buffer << std::setw(PROFILER_FIELD_LENGTH_FP) << std::right << "avg"
<< " ";
buffer << std::setw(PROFILER_FIELD_LENGTH_FP) << std::right << "stdev"
<< " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << "max"
<< " ";
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buffer << "/ usec" << std::endl;
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s_all_profilers.sort([](Profiler* a, Profiler* b) { return *b < *a; });
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for (auto profiler : s_all_profilers)
{
buffer << profiler->Read() << std::endl;
}
s_lazy_result = buffer.str();
return s_lazy_result;
}
void Profiler::Start()
{
if (!m_depth++)
{
m_time = Common::Timer::GetTimeUs();
}
}
void Profiler::Stop()
{
if (!--m_depth)
{
u64 end = Common::Timer::GetTimeUs();
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u64 diff = end - m_time;
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m_usecs += diff;
m_usecs_min = std::min(m_usecs_min, diff);
m_usecs_max = std::max(m_usecs_max, diff);
m_usecs_quad += diff * diff;
m_calls++;
}
}
std::string Profiler::Read()
{
double avg = 0;
double stdev = 0;
double time_rel = 0;
if (m_calls)
{
avg = double(m_usecs) / m_calls;
stdev = std::sqrt(double(m_usecs_quad) / m_calls - avg * avg);
}
else
{
m_usecs_min = 0;
}
if (s_usecs_frame)
{
time_rel = double(m_usecs) * 100 / s_usecs_frame;
}
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std::ostringstream buffer;
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buffer << std::setw(s_max_length) << std::left << m_name << " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << m_calls << " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << m_usecs << " ";
buffer << std::setw(PROFILER_FIELD_LENGTH_FP) << std::right << time_rel << " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << m_usecs_min << " ";
buffer << std::setw(PROFILER_FIELD_LENGTH_FP) << std::right << std::fixed << std::setprecision(2)
<< avg << " ";
buffer << std::setw(PROFILER_FIELD_LENGTH_FP) << std::right << std::fixed << std::setprecision(2)
<< stdev << " ";
buffer << std::setw(PROFILER_FIELD_LENGTH) << std::right << m_usecs_max;
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m_usecs = 0;
m_usecs_min = UINT64_MAX;
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m_usecs_max = 0;
m_usecs_quad = 0;
m_calls = 0;
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return buffer.str();
}
} // namespace Common