profile.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * Copyright (C) 2019-2020 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Tomasz Wlostowski <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#ifndef TPROFILE_H
#define TPROFILE_H
 
#include <atomic>
#include <chrono>
#include <string>
#include <iostream>
#include <iomanip>
 
class PROF_TIMER
{
public:
 PROF_TIMER( const std::string& aName, bool aAutostart = true ) :
 m_name( aName ), m_running( false )
 {
 if( aAutostart )
 Start();
 }
 
 PROF_TIMER()
 {
 Start();
 }
 
 void Start()
 {
 m_running = true;
 m_starttime = CLOCK::now();
 m_lasttime = m_starttime;
 }
 
 
 void Stop()
 {
 if( !m_running )
 return;
 
 m_stoptime = CLOCK::now();
 m_running = false;
 }
 
 void Show( std::ostream& aStream = std::cerr )
 {
 using DURATION = std::chrono::duration<double, std::nano>;
 
 const auto duration = SinceStart<DURATION>();
 const double cnt = duration.count();
 
 if( m_name.size() )
 {
 aStream << m_name << " took ";
 }
 
 if( cnt < 1e3 )
 aStream << cnt << "ns";
 else if( cnt < 1e6 )
 aStream << cnt / 1e3 << "µs";
 else if( cnt < 1e9 )
 aStream << cnt / 1e6 << "ms";
 else
 aStream << cnt / 1e9 << "s";
 
 aStream << std::endl;
 }
 
 template <typename DURATION>
 DURATION SinceStart( bool aSinceLast = false )
 {
 const TIME_POINT stoptime = m_running ? CLOCK::now() : m_stoptime;
 const TIME_POINT starttime = aSinceLast ? m_lasttime : m_starttime;
 
 m_lasttime = stoptime;
 
 return std::chrono::duration_cast<DURATION>( stoptime - starttime );
 }
 
 double msecs( bool aSinceLast = false )
 {
 using DUR_MS = std::chrono::duration<double, std::milli>;
 return SinceStart<DUR_MS>( aSinceLast ).count();
 }
 
 std::string to_string()
 {
 char tmp[1024];
 snprintf( tmp, sizeof( tmp ), "%s: %-6.1fms", m_name.c_str(), msecs() );
 return tmp;
 }
 
private:
 std::string m_name; // a string printed in message
  bool m_running;
 
 using CLOCK = std::chrono::high_resolution_clock;
 using TIME_POINT = std::chrono::time_point<CLOCK>;
 
 TIME_POINT m_starttime, m_lasttime, m_stoptime;
};
 
 
template <typename DURATION>
class SCOPED_PROF_TIMER : public PROF_TIMER
{
public:
 SCOPED_PROF_TIMER( DURATION& aDuration ) : PROF_TIMER(), m_duration( aDuration )
 {
 }
 
 ~SCOPED_PROF_TIMER()
 {
 // update the output
 m_duration = m_counter.SinceStart<DURATION>();
 }
 
private:
 PROF_TIMER m_counter;
 
 DURATION& m_duration;
};
 
 
unsigned GetRunningMicroSecs();
 
 
class PROF_COUNTER
{
public:
 PROF_COUNTER() :
 m_name( "Anonymous" ),
 m_count( 0 )
 {
 }
 
 PROF_COUNTER( const std::string& aName ) :
 m_name( aName ),
 m_count( 0 )
 {
 }
 
 unsigned long long Count() const
 {
 return m_count.load();
 }
 
 void Reset()
 {
 m_count.store( 0 );
 }
 
 unsigned long long operator++( int )
 {
 return m_count++;
 }
 
 void Show( std::ostream& aStream = std::cerr )
 {
 if( m_name.size() )
 aStream << m_name << ": ";
 
 aStream << m_count.load();
 aStream << std::endl;
 }
 
private:
 std::string m_name;
 std::atomic_ullong m_count;
};
 
#endif // TPROFILE_H