GenericEventHandler.hpp

/*

Copyright (c) 2005-2012, University of Oxford.
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This file is part of Chaste.

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 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
 * 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.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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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("%3i: ", 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())
        {
            double total_cpu_time[NUM_EVENTS];
            MPI_Reduce(&mWallTime[0], total_cpu_time, NUM_EVENTS, MPI_DOUBLE, MPI_SUM, 0, PETSC_COMM_WORLD);
            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, PETSC_COMM_WORLD);
            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_*/