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108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
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// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
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//
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// Eigen is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 3 of the License, or (at your option) any later version.
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//
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// Alternatively, you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of
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// the License, or (at your option) any later version.
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//
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// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License and a copy of the GNU General Public License along with
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// Eigen. If not, see <http://www.gnu.org/licenses/>.
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#ifndef EIGEN_BENCH_TIMER_H
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#define EIGEN_BENCH_TIMER_H
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#ifndef WIN32
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#include <time.h>
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#include <unistd.h>
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#else
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#define NOMINMAX
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#include <windows.h>
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#endif
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#include <cstdlib>
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#include <numeric>
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namespace Eigen
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{
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/** Elapsed time timer keeping the best try.
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*
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* On POSIX platforms we use clock_gettime with CLOCK_PROCESS_CPUTIME_ID.
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* On Windows we use QueryPerformanceCounter
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*
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* Important: on linux, you must link with -lrt
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*/
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class BenchTimer
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{
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public:
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BenchTimer()
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{
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#ifdef WIN32
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LARGE_INTEGER freq;
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QueryPerformanceFrequency(&freq);
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m_frequency = (double)freq.QuadPart;
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#endif
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reset();
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}
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~BenchTimer() {}
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inline void reset(void) {m_best = 1e6;}
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inline void start(void) {m_start = getTime();}
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inline void stop(void)
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{
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m_best = std::min(m_best, getTime() - m_start);
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}
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/** Return the best elapsed time in seconds.
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*/
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inline double value(void)
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{
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return m_best;
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}
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#ifdef WIN32
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inline double getTime(void)
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#else
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static inline double getTime(void)
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#endif
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{
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#ifdef WIN32
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LARGE_INTEGER query_ticks;
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QueryPerformanceCounter(&query_ticks);
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return query_ticks.QuadPart/m_frequency;
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#else
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timespec ts;
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clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
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return double(ts.tv_sec) + 1e-9 * double(ts.tv_nsec);
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#endif
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}
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protected:
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#ifdef WIN32
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double m_frequency;
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#endif
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double m_best, m_start;
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};
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}
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#endif // EIGEN_BENCH_TIMER_H
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