timer.h

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/*
    This file is part of the CVD Library.

    Copyright (C) 2005 The Authors

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
//
// A timer class designed for dealing with timestamps
// CK Nov 2002
//

#ifndef __CVD_TIMER_H
#define __CVD_TIMER_H
#include <iostream>
#include <string>
#include <cassert>
#include <deque>
struct timeval;

namespace CVD {

class cvd_timer
{
    public:
        cvd_timer();
        double get_time();

        double conv_ntime(signed long long time);

        double conv_ntime(const struct timeval& tv);

        double conv_ntime(const double time) const {
            return time - startTime * 1.e-6;
        }

        double reset();


    private:
        unsigned long long startTime;
};

extern cvd_timer timer;

double get_time_of_day();


class SimpleTimer
{
    public:
        SimpleTimer(const std::string &description, const int &cycles_to_time=1, bool output=true, std::ostream &out=std::cout) : output_info(output), max(0), min(0), average(0), text(description), period(cycles_to_time), increment(0), timings(0), cumulative_time(0), time_at_start_of_timing(0), timing_started(false), sout(out)
        {
            assert(period>0);
            internal_cvd_timer=new cvd_timer();
        }

        ~SimpleTimer()
        {
            delete internal_cvd_timer;
        }

        void click()
        {
                if (!timing_started)
                {
                    timing_started=true;
                    time_at_start_of_timing=internal_cvd_timer->get_time();
                }
                else if (timing_started)
                {
                    increment=internal_cvd_timer->get_time()-time_at_start_of_timing;
                    time_buffer.push_back(increment);
                    if((int)time_buffer.size()>period&&period>0)
                        time_buffer.pop_front();
                    timings++;
                    timing_started=false;
                    if (timings%period==0 && output_info)
                        print();
                }
        }

        void print()
        {
            if(timings>0)
            {
                if((int)time_buffer.size()==1)
                    sout<<text<<" takes: "<<get_average()<<"s over 1 timing"<<std::endl;
                else
                    sout<<text<<" takes : av "<<get_average()<<"s , max "<<get_max()<<"s, min "<<get_min()<<"s, over "<<time_buffer.size()<<" timings"<<std::endl;
            }
            else
                sout<<text<<" section : error. No timed cycles. Use click() to start and stop timing."<<std::endl;
        }

        double get_max(){
            max=-1;
            if (time_buffer.size()>0)
                max=time_buffer[0];
            if(time_buffer.size()>1)
                for(int i=0; i<(int)time_buffer.size(); ++i)
                    max=std::max(time_buffer[i], max);

            return max;

        }

        double get_min(){
            min=-1;
            if (time_buffer.size()>0)
                min=time_buffer[0];
            if(time_buffer.size()>1)
                for(int i=0; i<(int)time_buffer.size(); ++i)
                    min=std::min(time_buffer[i], min);
            return min;
        }

        double get_average(){
            average=-1;
            if(time_buffer.size()>0){
            cumulative_time=0;
            for(int i=0; i<(int)time_buffer.size(); ++i)
                cumulative_time+=time_buffer[i];
            average=cumulative_time/time_buffer.size();
            }
            return average;
        }

    private:
        bool output_info;
        double max, min, average;
        std::string text;
        int period;
        double increment;
        int timings;
        double cumulative_time;
        double time_at_start_of_timing;
        bool timing_started;
        cvd_timer* internal_cvd_timer;
        std::ostream& sout;
        std::deque<double> time_buffer;


};

}

#endif