Measure.cc

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/*---------------------------------------------------------------------\
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|                           / / \ V /|  _/  _/                         |
|                          / /__ | | | | | |                           |
|                         /_____||_| |_| |_|                           |
|                                                                      |
\---------------------------------------------------------------------*/
extern "C"
{
#include <sys/times.h>
#include <unistd.h>
}
#include <iostream>

#include "zypp/base/Logger.h"
#include "zypp/base/Measure.h"
#include "zypp/base/String.h"

using std::endl;

#undef ZYPP_BASE_LOGGER_LOGGROUP
#define ZYPP_BASE_LOGGER_LOGGROUP "Measure"

namespace zypp
{ 

  namespace debug
  { 

    namespace
    { 

      struct Tm
      {
        Tm()
        : _real( 0 )
        , _proc( tmsEmpty )
        {}

        void get()
        {
          _real = ::time(NULL);
          ::times( &_proc );
        }

        Tm operator-( const Tm & rhs ) const
        {
          Tm ret( *this );
          ret._real -= rhs._real;
          ret._proc.tms_utime -= rhs._proc.tms_utime;
          ret._proc.tms_stime -= rhs._proc.tms_stime;
          ret._proc.tms_cutime -= rhs._proc.tms_cutime;
          ret._proc.tms_cstime -= rhs._proc.tms_cstime;
          return ret;
        }

        std::string asString() const
        {
          std::string ret( timeStr( _real ) );
          ret += " (u ";
          ret += timeStr( asSec( _proc.tms_utime ) );
          ret += " s ";
          ret += timeStr( asSec( _proc.tms_stime ) );
          ret += " c ";
          ret += timeStr( asSec( _proc.tms_cutime + _proc.tms_cstime ) );
          ret += ")";
          return ret;
        }

        std::string stringIf( clock_t ticks_r, const std::string & tag_r ) const
        {
          std::string ret;
          if ( ticks_r )
            {
              ret += tag_r;
              ret += timeStr( asSec( ticks_r ) );
            }
          return ret;
        }

        double asSec( clock_t ticks_r ) const
        { return double(ticks_r) / ticks; }

        std::string timeStr( time_t sec_r ) const
        {
          time_t h = sec_r/3600;
          sec_r -= h*3600;
          time_t m = sec_r/60;
          sec_r -= m*60;
          if ( h )
            return str::form( "%lu:%02lu:%02lu", h, m, sec_r );
          if ( m )
            return str::form( "%lu:%02lu", m, sec_r );
          return str::form( "%lu", sec_r );
        }

        std::string timeStr( double sec_r ) const
        {
          time_t h = time_t(sec_r)/3600;
          sec_r -= h*3600;
          time_t m = time_t(sec_r)/60;
          sec_r -= m*60;
          if ( h )
            return str::form( "%lu:%02lu:%05.2lf", h, m, sec_r );
          if ( m )
            return str::form( "%lu:%05.2lf", m, sec_r );
          return str::form( "%.2lf", sec_r );
        }

        static const long ticks;
        static const struct tms tmsEmpty;
        time_t      _real;
        struct tms  _proc;
      };

      const struct tms Tm::tmsEmpty = { 0, 0, 0, 0 };
      const long Tm::ticks = sysconf(_SC_CLK_TCK);

      std::ostream & operator<<( std::ostream & str, const Tm & obj )
      {
        return str << obj.asString();
      }

    } // namespace

    //
    //  CLASS NAME : Measure::Impl
    //
    class Measure::Impl
    {
    public:
      Impl( const std::string & ident_r )
      : _ident  ( ident_r )
      , _seq    ( 0 )
      {
        INT << "START MEASURE(" << _ident << ")" << endl;
        _start.get();
      }

      ~Impl()
      {
        _stop.get();
        ++_seq;
        std::ostream & str( INT << "MEASURE(" << _ident << ") " );
        dumpMeasure( str );
      }

      void restart()
      {
        INT << "RESTART MEASURE(" << _ident << ")" << endl;
        _start = _stop;
      }
      
      void elapsed() const
      {
        _stop.get();
        ++_seq;
        std::ostream & str( INT << "ELAPSED(" << _ident << ") " );
        dumpMeasure( str );
        _elapsed = _stop;
      }

    private:
      std::ostream & dumpMeasure( std::ostream & str_r ) const
      {
        str_r << ( _stop - _start );
        if ( _seq > 1 ) // diff to previous _elapsed
          {
            str_r << " [" << ( _stop - _elapsed ) << "]";
          }
        return str_r << endl;
      }

    private:
      std::string       _ident;
      Tm               _start;
      mutable unsigned _seq;
      mutable Tm       _elapsed;
      mutable Tm       _stop;
    };

    //
    //  CLASS NAME : Measure
    //

    //
    //  METHOD NAME : Measure::Measure
    //  METHOD TYPE : Ctor
    //
    Measure::Measure()
    {}

    //
    //  METHOD NAME : Measure::Measure
    //  METHOD TYPE : Ctor
    //
    Measure::Measure( const std::string & ident_r )
    : _pimpl( new Impl( ident_r ) )
    {}

    //
    //  METHOD NAME : Measure::~Measure
    //  METHOD TYPE : Dtor
    //
    Measure::~Measure()
    {}

    //
    //  METHOD NAME : Measure::start
    //  METHOD TYPE : void
    //
    void Measure::start( const std::string & ident_r )
    {
      stop();
      _pimpl.reset( new Impl( ident_r ) );
    }

    //
    //  METHOD NAME : Measure::start
    //  METHOD TYPE : void
    //
    void Measure::restart()
    {
      _pimpl->restart();
    }
    
    //
    //  METHOD NAME : Measure::
    //  METHOD TYPE : void
    //
    void Measure::elapsed() const
    {
      if ( _pimpl )
        _pimpl->elapsed();
    }

    //
    //  METHOD NAME : Measure::
    //  METHOD TYPE : void
    //
    void Measure::stop()
    {
      _pimpl.reset();
    }

  } // namespace debug
} // namespace zypp

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