128 lines
3.6 KiB
C++
128 lines
3.6 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 2, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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// MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free
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// software library without restriction. Specifically, if other files
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// instantiate templates or use macros or inline functions from this
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// file, or you compile this file and link it with other files to
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// produce an executable, this file does not by itself cause the
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// resulting executable to be covered by the GNU General Public
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// License. This exception does not however invalidate any other
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// reasons why the executable file might be covered by the GNU General
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// Public License.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file timing_test_base.hpp
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* Contains a base class for timing tests.
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*/
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#ifndef PB_DS_TIMING_TEST_BASE_HPP
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#define PB_DS_TIMING_TEST_BASE_HPP
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#include <performance/time/elapsed_timer.hpp>
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#include <statistic/result_recorder.hpp>
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namespace pb_ds
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{
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namespace test
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{
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namespace detail
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{
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class timing_test_base
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{
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protected:
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template<typename Functor>
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double
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operator()(Functor& fn);
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static double
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min_time_res();
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private:
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template<typename Functor>
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std::size_t
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get_min_resolution(Functor&);
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template<typename Functor>
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double
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run_at_resolution(Functor&, std::size_t);
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};
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template<typename Functor>
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double
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timing_test_base::operator()(Functor& fn)
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{
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const std::size_t resolution = get_min_resolution(fn);
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pb_ds::test::detail::result_recorder<double> rec;
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double res;
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do
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res = run_at_resolution(fn, resolution);
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while (rec.add_result(res) == false);
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res = rec.get_sample_mean() / resolution;
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return res;
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}
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double
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timing_test_base::min_time_res()
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{ return 1e-7; }
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template<typename Functor>
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std::size_t
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timing_test_base::get_min_resolution(Functor& fn)
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{
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std::size_t guess = 0;
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const double epsilon_val = min_time_res();
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double res;
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do
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{
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guess = guess * 2 + 1;
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res = run_at_resolution(fn, guess);
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}
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while (res < epsilon_val);
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return guess;
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}
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template<typename Functor>
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double
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timing_test_base::run_at_resolution(Functor& fn, std::size_t resolution)
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{
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elapsed_timer res;
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fn(resolution);
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return res;
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}
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} // namespace detail
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} // namespace test
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} // namespace pb_ds
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#endif
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