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