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       1                 :            : // *****************************************************************************
       2                 :            : /*!
       3                 :            :   \file      src/Base/Timer.hpp
       4                 :            :   \copyright 2012-2015 J. Bakosi,
       5                 :            :              2016-2018 Los Alamos National Security, LLC.,
       6                 :            :              2019-2021 Triad National Security, LLC.
       7                 :            :              All rights reserved. See the LICENSE file for details.
       8                 :            :   \brief     Timer declaration
       9                 :            :   \details   Timer declaration. Timer is a simple class to do timing various
      10                 :            :     parts of the code in a portable way. The functionality is intended to be
      11                 :            :     very minimal and simple, but still convenient to use, with as little state
      12                 :            :     as possible. For an example client code, see walker::Main in Main/Walker.C.
      13                 :            : */
      14                 :            : // *****************************************************************************
      15                 :            : #ifndef Timer_h
      16                 :            : #define Timer_h
      17                 :            : 
      18                 :            : #include <cstdint>
      19                 :            : #include <chrono>
      20                 :            : 
      21                 :            : #include "NoWarning/pup.hpp"      // for er
      22                 :            : #include "Types.hpp"
      23                 :            : 
      24                 :            : namespace tk {
      25                 :            : 
      26                 :            : //! Timer is a simple class to do timing various parts of the code in a portable
      27                 :            : //! way. The functionality is intended to be very minimal and simple, but still
      28                 :            : //! convenient to use, with as little state as possible.
      29                 :            : class Timer {
      30                 :            : 
      31                 :            :   public:
      32                 :            :     // Shorthands for seconds duration, hours, minutes, seconds
      33                 :            :     using Dsec = std::chrono::duration< real >;
      34                 :            :     using hours = std::chrono::hours;
      35                 :            :     using minutes = std::chrono::minutes;
      36                 :            :     using seconds = std::chrono::seconds;
      37                 :            :     // Shorthand for clock, setting clock type
      38                 :            :     using clock = std::chrono::high_resolution_clock;
      39                 :            : 
      40                 :            :     //! Watch stores time in hours:minutes:seconds
      41                 :            :     struct Watch {
      42                 :            :       hours hrs;
      43                 :            :       minutes min;
      44                 :            :       seconds sec;
      45                 :            :       //! Zero constructor. Zeros hours, minutes, and seconds.
      46                 :       3405 :       explicit Watch() :
      47         [ +  - ]:       3405 :         hrs( std::chrono::duration_cast< hours >( clock::duration::zero()) ),
      48         [ +  - ]:       3405 :         min( std::chrono::duration_cast< minutes >( clock::duration::zero() ) ),
      49         [ +  - ]:       3405 :         sec( std::chrono::duration_cast< seconds >( clock::duration::zero() ) )
      50                 :       3405 :       {}
      51                 :            :       //! Fill constructor. Initialize hours, minutes, and seconds given.
      52                 :        198 :       explicit Watch( hours&& h, minutes&& m, seconds&& s ) :
      53                 :        198 :         hrs( std::move(h) ), min( std::move(m) ), sec( std::move(s) ) {}
      54                 :            :     };
      55                 :            : 
      56                 :            :     //! Constructor: initialize clock to current time stamp.
      57                 :        717 :     explicit Timer() : m_start( clock::now() ) {}
      58                 :            : 
      59                 :            :     //! Zero timer
      60                 :            :     void zero() { m_start = clock::now(); } 
      61                 :            : 
      62                 :            :     //! Query time in second since the constructor call.
      63                 :            :     //! \return Time elapsed between start and stop as a real number
      64                 :        126 :     real dsec() const {
      65 [ +  - ][ +  - ]:        126 :       return std::chrono::duration_cast< Dsec >(clock::now() - m_start).count();
      66                 :            :     }
      67                 :            : 
      68                 :            :     //! Query time in second since the constructor call.
      69                 :            :     Watch hms() const;
      70                 :            : 
      71                 :            :     //! Estimate time for accomplishment
      72                 :            :     void eta( real term, real time, uint64_t nstep, uint64_t it,
      73                 :            :               Watch& elapsedWatch, Watch& estimatedWatch ) const;
      74                 :            : 
      75                 :            :     /** @name Pack/Unpack: Serialize Timer object for Charm++ */
      76                 :            :     ///@{
      77                 :            :     //! Pack/Unpack serialize member function
      78                 :            :     //! \param[in,out] p Charm++'s PUP::er serializer object reference
      79                 :          3 :     void pup( PUP::er& p )
      80                 :          3 :     { p( reinterpret_cast<char*>(&m_start), sizeof(clock::time_point) ); }
      81                 :            :     //! \brief Pack/Unpack serialize operator|
      82                 :            :     //! \param[in,out] p Charm++'s PUP::er serializer object reference
      83                 :            :     //! \param[in,out] t Timer object reference
      84                 :          3 :     friend void operator|( PUP::er& p, Timer& t ) { t.pup(p); } 
      85                 :            :     ///@}
      86                 :            : 
      87                 :            :   private:
      88                 :            :     clock::time_point m_start;  //!< Time stamp at start
      89                 :            : };
      90                 :            : 
      91                 :            : //! Convert existing time stamp as a real to Watch (global scope)
      92                 :            : Timer::Watch
      93                 :            : hms( tk::real stamp );
      94                 :            : 
      95                 :            : } // tk::
      96                 :            : 
      97                 :            : #endif // Timer_h