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BenchTimer backport (clock_gettime & QueryPerformanceCounter).

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This commit is contained in:
Hauke Heibel 2010-02-03 21:55:01 +01:00
parent a9eabed421
commit 743ad75595
1 changed files with 42 additions and 11 deletions
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53
bench/BenchTimer.h
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@ -1,8 +1,8 @@
// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
// for linear algebra.
//
// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
@ -26,8 +26,15 @@
#ifndef EIGEN_BENCH_TIMER_H
#define EIGEN_BENCH_TIMER_H
#include <sys/time.h>
#if defined(_WIN32) || defined(__CYGWIN__)
#define NOMINMAX
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <time.h>
#include <unistd.h>
#endif
#include <cstdlib>
#include <numeric>
@ -35,12 +42,25 @@ namespace Eigen
{
/** Elapsed time timer keeping the best try.
*
* On POSIX platforms we use clock_gettime with CLOCK_PROCESS_CPUTIME_ID.
* On Windows we use QueryPerformanceCounter
*
* Important: on linux, you must link with -lrt
*/
class BenchTimer
{
public:
BenchTimer() { reset(); }
BenchTimer()
{
#if defined(_WIN32) || defined(__CYGWIN__)
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
m_frequency = (double)freq.QuadPart;
#endif
reset();
}
~BenchTimer() {}
@ -51,23 +71,34 @@ public:
m_best = std::min(m_best, getTime() - m_start);
}
/** Return the best elapsed time.
/** Return the best elapsed time in seconds.
*/
inline double value(void)
{
return m_best;
return m_best;
}
#if defined(_WIN32) || defined(__CYGWIN__)
inline double getTime(void)
#else
static inline double getTime(void)
#endif
{
struct timeval tv;
struct timezone tz;
gettimeofday(&tv, &tz);
return (double)tv.tv_sec + 1.e-6 * (double)tv.tv_usec;
#ifdef WIN32
LARGE_INTEGER query_ticks;
QueryPerformanceCounter(&query_ticks);
return query_ticks.QuadPart/m_frequency;
#else
timespec ts;
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
return double(ts.tv_sec) + 1e-9 * double(ts.tv_nsec);
#endif
}
protected:
#if defined(_WIN32) || defined(__CYGWIN__)
double m_frequency;
#endif
double m_best, m_start;
};