GenericEventHandler.hpp

/*

Copyright (c) 2005-2014, University of Oxford.
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 * Redistributions of source code must retain the above copyright notice,
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 * Redistributions in binary form must reproduce the above copyright notice,
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   contributors may be used to endorse or promote products derived from this
   software without specific prior written permission.

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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*/

#ifndef GENERICEVENTHANDLER_HPP_
#define GENERICEVENTHANDLER_HPP_

#include <cassert>
#include <ctime>
#include <iostream>

#include "Exception.hpp"
#include "PetscTools.hpp"

template <unsigned NUM_EVENTS, class CONCRETE>
class GenericEventHandler
{
    friend class TestGenericEventHandler;
    friend class TestCellBasedEventHandler;
    friend class TestHeartEventHandler;

private:

    std::vector<double> mWallTime; 
    std::vector<bool> mHasBegun; 
    bool mEnabled; 
    bool mInUse; 
    static inline void MilliSleep(unsigned milliseconds)
    {
        double start = MPI_Wtime();
        double min_Wtime = milliseconds/1000.0 + start;
        while (MPI_Wtime() < min_Wtime)
        {
            //pause;
        }
    }

    inline double GetWallTime()
    {
        return MPI_Wtime();
    }

    inline double ConvertWallTimeToMilliseconds(double wallTime)
    {
        return wallTime*1000.0;
    }

    inline double ConvertWallTimeToSeconds(double wallTime)
    {
        return wallTime;
    }

public:

    static GenericEventHandler<NUM_EVENTS, CONCRETE>* Instance()
    {
        static CONCRETE inst;
        return &inst;
    }

    static void Reset()
    {
        Instance()->ResetImpl();
    }

    static void BeginEvent(unsigned event) throw (Exception)
    {
        Instance()->BeginEventImpl(event);
    }

    static void EndEvent(unsigned event)
    {
        Instance()->EndEventImpl(event);
    }

    static double GetElapsedTime(unsigned event)
    {
        return Instance()->GetElapsedTimeImpl(event);
    }

    static void Report()
    {
        Instance()->ReportImpl();
    }

    static void Headings()
    {
        Instance()->HeadingsImpl();
    }

    static void Enable()
    {
        Instance()->EnableImpl();
    }

    static void Disable()
    {
        Instance()->DisableImpl();
    }

    static bool IsEnabled()
    {
        return Instance()->IsEnabledImpl();
    }

protected:

    GenericEventHandler()
    {
        mEnabled = true;
        mInUse = false;
        mWallTime.resize(NUM_EVENTS, 0.0);
        mHasBegun.resize(NUM_EVENTS, false);
    }

private:

    void ResetImpl()
    {
        for (unsigned event=0; event<NUM_EVENTS; event++)
        {
            mWallTime[event] = 0.0;
            mHasBegun[event] = false;
        }
        Enable();
        mInUse = false;
    }

    void BeginEventImpl(unsigned event) throw (Exception)
    {
        if (!mEnabled)
        {
            return;
        }
#ifdef CHASTE_EVENT_BARRIERS
        PetscTools::Barrier("BeginEvent");
#endif
        mInUse = true;
        assert(event<NUM_EVENTS);
        // Check that we are recording the total
        if (event != NUM_EVENTS-1) // If use <, Intel complains when NUM_EVENTS==1
        {
            if (!mHasBegun[NUM_EVENTS-1])
            {
                // Silently open the "total" event
                BeginEvent(NUM_EVENTS-1);
            }
        }
        if (mHasBegun[event])
        {
            std::string msg;
            msg += "The event associated with the counter for '";
            msg += CONCRETE::EventName[event];
            msg += "' had already begun when BeginEvent was called.";
            std::cerr << msg << std::endl << std::flush;
            Disable();
            return;
        }
        mWallTime[event] -= GetWallTime();
        mHasBegun[event] = true;
        //std::cout << PetscTools::GetMyRank()<<": Beginning " << EVENT_NAME[event] << " @ " << (clock()/1000) << std::endl;
    }

    void EndEventImpl(unsigned event)
    {
        assert(event<NUM_EVENTS);
        if (!mEnabled)
        {
            return;
        }
#ifdef CHASTE_EVENT_BARRIERS
        PetscTools::Barrier("EndEvent");
#endif
        if (!mHasBegun[event])
        {
            std::string msg;
            msg += "Error: The event associated with the counter for '";
            msg += CONCRETE::EventName[event];
            msg += "' had not begun when EndEvent was called.";
            EXCEPTION(msg);
        }
        mWallTime[event] += GetWallTime();
        mHasBegun[event] = false;
        //std::cout << PetscTools::GetMyRank()<<": Ending " << EVENT_NAME[event] << " @ " << (clock()/1000) << std::endl;
    }

    double GetElapsedTimeImpl(unsigned event)
    {
        assert(event<NUM_EVENTS);
        if (!mEnabled)
        {
            return 0.0;
        }
        double time;
        if (mHasBegun[event])
        {
            time =  mWallTime[event] + GetWallTime();
        }
        else
        {
            time = mWallTime[event];
        }
        return ConvertWallTimeToMilliseconds(time);
    }

    void ReportImpl()
    {
        if (!mEnabled)
        {
            EXCEPTION("Asked to report on a disabled event handler.  Check for contributory errors above.");
        }
        if (!mInUse)
        {
            EXCEPTION("Asked to report on an event handler which is set to zero.");
        }
        // Check that all events are finished
        for (unsigned event=0; event<NUM_EVENTS; event++)
        {
            if (mHasBegun[event])
            {
                // Silently close event
                EndEvent(event);
            }
        }
        const unsigned top_event = NUM_EVENTS-1;
        double total = ConvertWallTimeToSeconds(mWallTime[top_event]);

        // Make the output precision depend on total run time
        const char* format;
        if (total > 999999.0)      // 11.5 days
        {
            format = "%8.0f ";     // will allow up to 115 days before columns unaligned
        }
        else if (total > 9999.0)   // 2.7 hours
        {
            format = "%8.1f ";
        }
        else
        {
            format = "%8.3f ";
        }

        PetscTools::BeginRoundRobin();
        {
            std::cout.flush();
            if (PetscTools::IsParallel())
            {
                // Report the process number at the beginning of the line
                printf("%3u: ", PetscTools::GetMyRank()); //5 chars
            }
            for (unsigned event=0; event<NUM_EVENTS; event++)
            {
                const double secs = ConvertWallTimeToSeconds(mWallTime[event]);
                printf(format, secs);
                printf("(%3.0f%%)  ", total == 0.0 ? 0.0 : (secs/total*100.0));
            }
            std::cout << "(seconds) \n";
        }
        PetscTools::EndRoundRobin();

        // If there is a collection of processes then report an average
        if (PetscTools::IsParallel() && !PetscTools::IsIsolated())
        {
            double total_cpu_time[NUM_EVENTS];
            MPI_Reduce(&mWallTime[0], total_cpu_time, NUM_EVENTS, MPI_DOUBLE, MPI_SUM, 0, PetscTools::GetWorld());
            if (PetscTools::AmMaster())
            {
                total = ConvertWallTimeToSeconds(total_cpu_time[top_event]);
                printf("avg: "); //5 chars
                for (unsigned event=0; event<NUM_EVENTS; event++)
                {
                    const double secs = ConvertWallTimeToSeconds(total_cpu_time[event]);
                    printf(format, secs/PetscTools::GetNumProcs());
                    printf("(%3.0f%%)  ", total == 0.0 ? 0.0 : (secs/total*100.0));
                }
                std::cout << "(seconds) \n";
            }

            double max_cpu_time[NUM_EVENTS];
            MPI_Reduce(&mWallTime[0], max_cpu_time, NUM_EVENTS, MPI_DOUBLE, MPI_MAX, 0, PetscTools::GetWorld());
            if (PetscTools::AmMaster())
            {
                total = ConvertWallTimeToSeconds(max_cpu_time[top_event]);
                printf("max: "); //5 chars
                for (unsigned event=0; event<NUM_EVENTS; event++)
                {
                    const double secs = ConvertWallTimeToSeconds(max_cpu_time[event]);
                    printf(format, secs);
                    printf("(%3.0f%%)  ", total == 0.0 ? 0.0 : (secs/total*100.0));
                }
                std::cout << "(seconds) \n";
            }
        }
        std::cout.flush();
        PetscTools::Barrier();
        std::cout.flush();

        Reset();
    }

    void HeadingsImpl()
    {
        // Make sure that all output (on all processes) is flushed
        std::cout.flush();
        PetscTools::Barrier();
        std::cout.flush();
        if (PetscTools::AmMaster())
        {
            if (PetscTools::IsParallel())
            {
                // Report the process number at the beginning of the line
                printf("Proc "); //5 chars
            }
            for (unsigned event=0; event<NUM_EVENTS; event++)
            {
                printf("%15s%2s", CONCRETE::EventName[event], "");
            }
            std::cout << "\n";
            std::cout.flush();
        }
    }

    void EnableImpl()
    {
        mEnabled = true;
    }

    void DisableImpl()
    {
        mEnabled = false;
    }

    bool IsEnabledImpl()
    {
        return mEnabled;
    }
};

#endif /*GENERICEVENTHANDLER_HPP_*/