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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
//
// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
// Copyright (C) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// Alternatively, 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.
//
// Eigen 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 Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#ifndef EIGEN_BENCH_TIMER_H
#define EIGEN_BENCH_TIMER_H
#include <sys/time.h>
#include <unistd.h>
#include <cstdlib>
namespace Eigen
{
/** Elapsed time timer keeping the best try.
*/
class BenchTimer
{
public:
BenchTimer() : m_best(1e99) {}
~BenchTimer() {}
inline void start(void) {m_start = getTime();}
inline void stop(void)
{
m_best = std::min(m_best, getTime() - m_start);
}
/** Return the best elapsed time.
*/
inline double value(void)
{
return m_best;
}
static inline double getTime(void)
{
struct timeval tv;
struct timezone tz;
gettimeofday(&tv, &tz);
return (double)tv.tv_sec + 1.e-6 * (double)tv.tv_usec;
}
protected:
double m_best, m_start;
};
}
#endif // EIGEN_BENCH_TIMER_H
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