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dlma/eigen-3.4.0/bench/btl/generic_bench/timers/portable_perf_analyzer.hh
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//=====================================================
// File : portable_perf_analyzer.hh
// Author : L. Plagne <laurent.plagne@edf.fr)>
// Copyright (C) EDF R&D, mar d�c 3 18:59:35 CET 2002
// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
//=====================================================
//
// 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.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
#ifndef _PORTABLE_PERF_ANALYZER_HH
#define _PORTABLE_PERF_ANALYZER_HH
#include "utilities.h"
#include "timers/portable_timer.hh"
template <class Action>
class Portable_Perf_Analyzer{
public:
Portable_Perf_Analyzer( ):_nb_calc(0), m_time_action(0), _chronos(){
MESSAGE("Portable_Perf_Analyzer Ctor");
};
Portable_Perf_Analyzer( const Portable_Perf_Analyzer & ){
INFOS("Copy Ctor not implemented");
exit(0);
};
~Portable_Perf_Analyzer(){
MESSAGE("Portable_Perf_Analyzer Dtor");
};
BTL_DONT_INLINE double eval_mflops(int size)
{
Action action(size);
// action.initialize();
// time_action = time_calculate(action);
while (m_time_action < MIN_TIME)
{
if(_nb_calc==0) _nb_calc = 1;
else _nb_calc *= 2;
action.initialize();
m_time_action = time_calculate(action);
}
// optimize
for (int i=1; i<BtlConfig::Instance.tries; ++i)
{
Action _action(size);
std::cout << " " << _action.nb_op_base()*_nb_calc/(m_time_action*1e6) << " ";
_action.initialize();
m_time_action = std::min(m_time_action, time_calculate(_action));
}
double time_action = m_time_action / (double(_nb_calc));
// check
if (BtlConfig::Instance.checkResults && size<128)
{
action.initialize();
action.calculate();
action.check_result();
}
return action.nb_op_base()/(time_action*1e6);
}
BTL_DONT_INLINE double time_calculate(Action & action)
{
// time measurement
action.calculate();
_chronos.start();
for (unsigned int ii=0;ii<_nb_calc;ii++)
{
action.calculate();
}
_chronos.stop();
return _chronos.user_time();
}
unsigned long long get_nb_calc()
{
return _nb_calc;
}
private:
unsigned long long _nb_calc;
double m_time_action;
Portable_Timer _chronos;
};
#endif //_PORTABLE_PERF_ANALYZER_HH
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