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