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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef PERF_H_83947184145342652456
#define PERF_H_83947184145342652456
#include <chrono>
//#include "scope_guard.h"
#include "string_tools.h"
#include <iostream>
//############# two macros for quick performance measurements ###############
#define PERF_START zen::PerfTimer perfTest;
#define PERF_STOP perfTest.showResult();
//###########################################################################
/* Example: Aggregated function call time:
static zen::PerfTimer perfTest(true); //startPaused
perfTest.resume();
ZEN_ON_SCOPE_EXIT(perfTest.pause()); */
namespace zen
{
/* issue with wxStopWatch? https://freefilesync.org/forum/viewtopic.php?t=1426
- wxStopWatch implementation uses QueryPerformanceCounter: https://github.com/wxWidgets/wxWidgets/blob/17d72a48ffd4d8ff42eed070ac48ee2de50ceabd/src/common/stopwatch.cpp
- whatever the problem was, it's almost certainly not caused by QueryPerformanceCounter():
MSDN: "How often does QPC roll over? Not less than 100 years from the most recent system boot"
https://docs.microsoft.com/en-us/windows/win32/sysinfo/acquiring-high-resolution-time-stamps#general-faq-about-qpc-and-tsc
- using the system clock is problematic: https://freefilesync.org/forum/viewtopic.php?t=5280
std::chrono::system_clock wraps ::GetSystemTimePreciseAsFileTime()
std::chrono::steady_clock wraps ::QueryPerformanceCounter() */
class StopWatch
{
public:
explicit StopWatch(bool startPaused = false)
{
if (startPaused)
startTime_ = {};
}
bool isPaused() const { return startTime_ == std::chrono::steady_clock::time_point{}; }
void pause()
{
if (!isPaused())
elapsedUntilPause_ += std::chrono::steady_clock::now() - std::exchange(startTime_, {});
}
void resume()
{
if (isPaused())
startTime_ = std::chrono::steady_clock::now();
}
std::chrono::nanoseconds elapsed() const
{
auto elapsedTotal = elapsedUntilPause_;
if (!isPaused())
elapsedTotal += std::chrono::steady_clock::now() - startTime_;
return elapsedTotal;
}
private:
std::chrono::steady_clock::time_point startTime_ = std::chrono::steady_clock::now();
std::chrono::nanoseconds elapsedUntilPause_{}; //std::chrono::duration is uninitialized by default! WTF! When will this stupidity end!
};
class PerfTimer
{
public:
[[deprecated]] explicit PerfTimer(bool startPaused = false) : watch_(startPaused) {}
~PerfTimer() { if (!resultShown_) showResult(); }
void pause () { watch_.pause(); }
void resume() { watch_.resume(); }
void showResult()
{
const int64_t timeMs = std::chrono::duration_cast<std::chrono::milliseconds>(watch_.elapsed()).count();
const std::string msg = numberTo<std::string>(timeMs) + " ms";
std::clog << "Perf: duration: " << msg + '\n';
resultShown_ = true;
watch_ = StopWatch(watch_.isPaused());
}
private:
StopWatch watch_;
bool resultShown_ = false;
};
}
#endif //PERF_H_83947184145342652456
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