annotate base/Profiler.h @ 537:3cc4b7cd2aa5

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

/*
   This is a modified version of a source file from the 
   Rosegarden MIDI and audio sequencer and notation editor.
   This file copyright 2000-2006 Chris Cannam, Guillaume Laurent,
   and QMUL.
*/


#ifndef _PROFILER_H_
#define _PROFILER_H_

#include "system/System.h"

#include <ctime>
#include <sys/time.h>
#include <map>

#include "RealTime.h"

//#define NO_TIMING 1

//#define WANT_TIMING 1

#ifdef NDEBUG
#ifndef WANT_TIMING
#define NO_TIMING 1
#endif
#endif

/**
 * Profiling classes
 */

/**
 * The class holding all profiling data
 *
 * This class is a singleton
 */
class Profiles
{
public:
    static Profiles* getInstance();
    ~Profiles();

    void accumulate(const char* id, clock_t time, RealTime rt);
    void dump() const;

protected:
    Profiles();

    typedef std::pair<clock_t, RealTime> TimePair;
    typedef std::pair<int, TimePair> ProfilePair;
    typedef std::map<const char *, ProfilePair> ProfileMap;
    typedef std::map<const char *, TimePair> LastCallMap;
    typedef std::map<const char *, TimePair> WorstCallMap;
    ProfileMap m_profiles;
    LastCallMap m_lastCalls;
    WorstCallMap m_worstCalls;

    static Profiles* m_instance;
};

#ifndef NO_TIMING

/**
 * Profile point instance class.  Construct one of these on the stack
 * at the start of a function, in order to record the time consumed
 * within that function.  The profiler object should be effectively
 * optimised out if NO_TIMING is defined, so any overhead in a release
 * build should be negligible so long as you remember to define that.
 */
class Profiler
{
public:
    /**
     * Create a profile point instance that records time consumed
     * against the given profiling point name.  If showOnDestruct is
     * true, the time consumed will be printed to stderr when the
     * object is destroyed; otherwise, only the accumulated, mean and
     * worst-case times will be shown when the program exits or
     * Profiles::dump() is called.
     */
    Profiler(const char *name, bool showOnDestruct = false);
    ~Profiler();

    void update() const;
    void end(); // same action as dtor

protected:
    const char* m_c;
    clock_t m_startCPU;
    RealTime m_startTime;
    bool m_showOnDestruct;
    bool m_ended;
};

#else

class Profiler
{
public:
    Profiler(const char *, bool = false) { }
    ~Profiler() { }

    void update() const { }
    void end() { }
};

#endif

#endif