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      1 //=====================================================
      2 // File   :  portable_perf_analyzer.hh
      3 // Author :  L. Plagne <laurent.plagne (at) edf.fr)>
      4 // Copyright (C) EDF R&D,  mar dc 3 18:59:35 CET 2002
      5 //=====================================================
      6 //
      7 // This program is free software; you can redistribute it and/or
      8 // modify it under the terms of the GNU General Public License
      9 // as published by the Free Software Foundation; either version 2
     10 // of the License, or (at your option) any later version.
     11 //
     12 // This program is distributed in the hope that it will be useful,
     13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 // GNU General Public License for more details.
     16 // You should have received a copy of the GNU General Public License
     17 // along with this program; if not, write to the Free Software
     18 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
     19 //
     20 #ifndef _PORTABLE_PERF_ANALYZER_HH
     21 #define _PORTABLE_PERF_ANALYZER_HH
     22 
     23 #include "utilities.h"
     24 #include "timers/portable_timer.hh"
     25 
     26 template <class Action>
     27 class Portable_Perf_Analyzer{
     28 public:
     29   Portable_Perf_Analyzer( void ):_nb_calc(1),_nb_init(1),_chronos(){
     30     MESSAGE("Portable_Perf_Analyzer Ctor");
     31   };
     32   Portable_Perf_Analyzer( const Portable_Perf_Analyzer & ){
     33     INFOS("Copy Ctor not implemented");
     34     exit(0);
     35   };
     36   ~Portable_Perf_Analyzer( void ){
     37     MESSAGE("Portable_Perf_Analyzer Dtor");
     38   };
     39 
     40 
     41 
     42   inline double eval_mflops(int size)
     43   {
     44 
     45     Action action(size);
     46 
     47 //     double time_baseline = time_init(action);
     48 //     while (time_baseline < MIN_TIME_INIT)
     49 //     {
     50 //       _nb_init *= 2;
     51 //       time_baseline = time_init(action);
     52 //     }
     53 //
     54 //     // optimize
     55 //     for (int i=1; i<NB_TRIES; ++i)
     56 //       time_baseline = std::min(time_baseline, time_init(action));
     57 //
     58 //     time_baseline = time_baseline/(double(_nb_init));
     59 
     60     double time_action = time_calculate(action);
     61     while (time_action < MIN_TIME)
     62     {
     63       _nb_calc *= 2;
     64       time_action = time_calculate(action);
     65     }
     66 
     67     // optimize
     68     for (int i=1; i<NB_TRIES; ++i)
     69       time_action = std::min(time_action, time_calculate(action));
     70 
     71 //     INFOS("size="<<size);
     72 //     INFOS("_nb_init="<<_nb_init);
     73 //     INFOS("_nb_calc="<<_nb_calc);
     74 
     75     time_action = time_action / (double(_nb_calc));
     76 
     77     action.check_result();
     78 
     79 
     80     double time_baseline = time_init(action);
     81     for (int i=1; i<NB_TRIES; ++i)
     82       time_baseline = std::min(time_baseline, time_init(action));
     83     time_baseline = time_baseline/(double(_nb_init));
     84 
     85 
     86 
     87 //     INFOS("time_baseline="<<time_baseline);
     88 //     INFOS("time_action="<<time_action);
     89 
     90     time_action = time_action - time_baseline;
     91 
     92 //     INFOS("time_corrected="<<time_action);
     93 
     94     return action.nb_op_base()/(time_action*1000000.0);
     95   }
     96 
     97   inline double time_init(Action & action)
     98   {
     99     // time measurement
    100     _chronos.start();
    101     for (int ii=0; ii<_nb_init; ii++)
    102       action.initialize();
    103     _chronos.stop();
    104     return _chronos.user_time();
    105   }
    106 
    107 
    108   inline double time_calculate(Action & action)
    109   {
    110     // time measurement
    111     _chronos.start();
    112     for (int ii=0;ii<_nb_calc;ii++)
    113     {
    114       action.initialize();
    115       action.calculate();
    116     }
    117     _chronos.stop();
    118     return _chronos.user_time();
    119   }
    120 
    121   unsigned long long get_nb_calc( void )
    122   {
    123     return _nb_calc;
    124   }
    125 
    126 
    127 private:
    128   unsigned long long _nb_calc;
    129   unsigned long long _nb_init;
    130   Portable_Timer _chronos;
    131 
    132 };
    133 
    134 #endif //_PORTABLE_PERF_ANALYZER_HH
    135