mirror of
https://github.com/fmtlib/fmt.git
synced 2024-12-25 15:21:54 +00:00
475 lines
15 KiB
C++
475 lines
15 KiB
C++
// Copyright (c) 2005-2010 Hartmut Kaiser
|
|
// Copyright (c) 2009 Edward Grace
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#if !defined(HIGH_RESOLUTION_TIMER_MAR_24_2008_1222PM)
|
|
#define HIGH_RESOLUTION_TIMER_MAR_24_2008_1222PM
|
|
|
|
#include <boost/config.hpp>
|
|
#include <boost/throw_exception.hpp>
|
|
|
|
#if defined(BOOST_HAS_UNISTD_H)
|
|
#include <unistd.h>
|
|
#endif
|
|
#include <time.h>
|
|
|
|
#if defined(BOOST_WINDOWS)
|
|
|
|
#include <stdexcept>
|
|
#include <limits>
|
|
#include <windows.h>
|
|
|
|
namespace util
|
|
{
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// high_resolution_timer
|
|
// A timer object measures elapsed time.
|
|
// CAUTION: Windows only!
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
class high_resolution_timer
|
|
{
|
|
public:
|
|
high_resolution_timer()
|
|
{
|
|
restart();
|
|
}
|
|
|
|
high_resolution_timer(double t)
|
|
{
|
|
LARGE_INTEGER frequency;
|
|
if (!QueryPerformanceFrequency(&frequency))
|
|
boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
|
|
|
|
start_time.QuadPart = (LONGLONG)(t * frequency.QuadPart);
|
|
}
|
|
|
|
high_resolution_timer(high_resolution_timer const& rhs)
|
|
: start_time(rhs.start_time)
|
|
{
|
|
}
|
|
|
|
static double now()
|
|
{
|
|
SYSTEMTIME st;
|
|
GetSystemTime(&st);
|
|
|
|
FILETIME ft;
|
|
SystemTimeToFileTime(&st, &ft);
|
|
|
|
LARGE_INTEGER now;
|
|
now.LowPart = ft.dwLowDateTime;
|
|
now.HighPart = ft.dwHighDateTime;
|
|
|
|
// FileTime is in 100ns increments, result needs to be in [s]
|
|
return now.QuadPart * 1e-7;
|
|
}
|
|
|
|
void restart()
|
|
{
|
|
if (!QueryPerformanceCounter(&start_time))
|
|
boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
|
|
}
|
|
double elapsed() const // return elapsed time in seconds
|
|
{
|
|
LARGE_INTEGER now;
|
|
if (!QueryPerformanceCounter(&now))
|
|
boost::throw_exception(std::runtime_error("Couldn't get current time"));
|
|
|
|
LARGE_INTEGER frequency;
|
|
if (!QueryPerformanceFrequency(&frequency))
|
|
boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
|
|
|
|
return double(now.QuadPart - start_time.QuadPart) / frequency.QuadPart;
|
|
}
|
|
|
|
double elapsed_max() const // return estimated maximum value for elapsed()
|
|
{
|
|
LARGE_INTEGER frequency;
|
|
if (!QueryPerformanceFrequency(&frequency))
|
|
boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
|
|
|
|
return double((std::numeric_limits<LONGLONG>::max)() - start_time.QuadPart) /
|
|
double(frequency.QuadPart);
|
|
}
|
|
|
|
double elapsed_min() const // return minimum value for elapsed()
|
|
{
|
|
LARGE_INTEGER frequency;
|
|
if (!QueryPerformanceFrequency(&frequency))
|
|
boost::throw_exception(std::runtime_error("Couldn't acquire frequency"));
|
|
|
|
return 1.0 / frequency.QuadPart;
|
|
}
|
|
|
|
private:
|
|
LARGE_INTEGER start_time;
|
|
};
|
|
|
|
} // namespace util
|
|
|
|
#elif defined(_POSIX_TIMERS) && _POSIX_TIMERS > 0 && defined(_POSIX_THREAD_CPUTIME)
|
|
|
|
#if _POSIX_THREAD_CPUTIME > 0 // timer always supported
|
|
|
|
namespace util
|
|
{
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// high_resolution_timer
|
|
// A timer object measures elapsed time.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
class high_resolution_timer
|
|
{
|
|
public:
|
|
high_resolution_timer()
|
|
{
|
|
start_time.tv_sec = 0;
|
|
start_time.tv_nsec = 0;
|
|
|
|
restart();
|
|
}
|
|
|
|
high_resolution_timer(double t)
|
|
{
|
|
start_time.tv_sec = time_t(t);
|
|
start_time.tv_nsec = (t - start_time.tv_sec) * 1e9;
|
|
}
|
|
|
|
high_resolution_timer(high_resolution_timer const& rhs)
|
|
: start_time(rhs.start_time)
|
|
{
|
|
}
|
|
|
|
static double now()
|
|
{
|
|
timespec now;
|
|
if (-1 == clock_gettime(CLOCK_REALTIME, &now))
|
|
boost::throw_exception(std::runtime_error("Couldn't get current time"));
|
|
return double(now.tv_sec) + double(now.tv_nsec) * 1e-9;
|
|
}
|
|
|
|
void restart()
|
|
{
|
|
if (-1 == clock_gettime(CLOCK_REALTIME, &start_time))
|
|
boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
|
|
}
|
|
double elapsed() const // return elapsed time in seconds
|
|
{
|
|
timespec now;
|
|
if (-1 == clock_gettime(CLOCK_REALTIME, &now))
|
|
boost::throw_exception(std::runtime_error("Couldn't get current time"));
|
|
|
|
if (now.tv_sec == start_time.tv_sec)
|
|
return double(now.tv_nsec - start_time.tv_nsec) * 1e-9;
|
|
|
|
return double(now.tv_sec - start_time.tv_sec) +
|
|
(double(now.tv_nsec - start_time.tv_nsec) * 1e-9);
|
|
}
|
|
|
|
double elapsed_max() const // return estimated maximum value for elapsed()
|
|
{
|
|
return double((std::numeric_limits<time_t>::max)() - start_time.tv_sec);
|
|
}
|
|
|
|
double elapsed_min() const // return minimum value for elapsed()
|
|
{
|
|
timespec resolution;
|
|
if (-1 == clock_getres(CLOCK_REALTIME, &resolution))
|
|
boost::throw_exception(std::runtime_error("Couldn't get resolution"));
|
|
return double(resolution.tv_sec + resolution.tv_nsec * 1e-9);
|
|
}
|
|
|
|
private:
|
|
timespec start_time;
|
|
};
|
|
|
|
} // namespace util
|
|
|
|
#else // _POSIX_THREAD_CPUTIME > 0
|
|
|
|
#include <boost/timer.hpp>
|
|
|
|
// availability of high performance timers must be checked at runtime
|
|
namespace util
|
|
{
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// high_resolution_timer
|
|
// A timer object measures elapsed time.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
class high_resolution_timer
|
|
{
|
|
public:
|
|
high_resolution_timer()
|
|
: use_backup(sysconf(_SC_THREAD_CPUTIME) <= 0)
|
|
{
|
|
if (!use_backup) {
|
|
start_time.tv_sec = 0;
|
|
start_time.tv_nsec = 0;
|
|
}
|
|
restart();
|
|
}
|
|
|
|
high_resolution_timer(double t)
|
|
: use_backup(sysconf(_SC_THREAD_CPUTIME) <= 0)
|
|
{
|
|
if (!use_backup) {
|
|
start_time.tv_sec = time_t(t);
|
|
start_time.tv_nsec = (t - start_time.tv_sec) * 1e9;
|
|
}
|
|
}
|
|
|
|
high_resolution_timer(high_resolution_timer const& rhs)
|
|
: use_backup(sysconf(_SC_THREAD_CPUTIME) <= 0),
|
|
start_time(rhs.start_time)
|
|
{
|
|
}
|
|
|
|
static double now()
|
|
{
|
|
if (sysconf(_SC_THREAD_CPUTIME) <= 0)
|
|
return double(std::clock());
|
|
|
|
timespec now;
|
|
if (-1 == clock_gettime(CLOCK_REALTIME, &now))
|
|
boost::throw_exception(std::runtime_error("Couldn't get current time"));
|
|
return double(now.tv_sec) + double(now.tv_nsec) * 1e-9;
|
|
}
|
|
|
|
void restart()
|
|
{
|
|
if (use_backup)
|
|
start_time_backup.restart();
|
|
else if (-1 == clock_gettime(CLOCK_REALTIME, &start_time))
|
|
boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
|
|
}
|
|
double elapsed() const // return elapsed time in seconds
|
|
{
|
|
if (use_backup)
|
|
return start_time_backup.elapsed();
|
|
|
|
timespec now;
|
|
if (-1 == clock_gettime(CLOCK_REALTIME, &now))
|
|
boost::throw_exception(std::runtime_error("Couldn't get current time"));
|
|
|
|
if (now.tv_sec == start_time.tv_sec)
|
|
return double(now.tv_nsec - start_time.tv_nsec) * 1e-9;
|
|
|
|
return double(now.tv_sec - start_time.tv_sec) +
|
|
(double(now.tv_nsec - start_time.tv_nsec) * 1e-9);
|
|
}
|
|
|
|
double elapsed_max() const // return estimated maximum value for elapsed()
|
|
{
|
|
if (use_backup)
|
|
start_time_backup.elapsed_max();
|
|
|
|
return double((std::numeric_limits<time_t>::max)() - start_time.tv_sec);
|
|
}
|
|
|
|
double elapsed_min() const // return minimum value for elapsed()
|
|
{
|
|
if (use_backup)
|
|
start_time_backup.elapsed_min();
|
|
|
|
timespec resolution;
|
|
if (-1 == clock_getres(CLOCK_REALTIME, &resolution))
|
|
boost::throw_exception(std::runtime_error("Couldn't get resolution"));
|
|
return double(resolution.tv_sec + resolution.tv_nsec * 1e-9);
|
|
}
|
|
|
|
private:
|
|
bool use_backup;
|
|
timespec start_time;
|
|
boost::timer start_time_backup;
|
|
};
|
|
|
|
} // namespace util
|
|
|
|
#endif // _POSIX_THREAD_CPUTIME > 0
|
|
|
|
#else // !defined(BOOST_WINDOWS) && (!defined(_POSIX_TIMERS)
|
|
// || _POSIX_TIMERS <= 0
|
|
// || !defined(_POSIX_THREAD_CPUTIME)
|
|
// || _POSIX_THREAD_CPUTIME <= 0)
|
|
|
|
#if defined(BOOST_HAS_GETTIMEOFDAY)
|
|
|
|
// For platforms that do not support _POSIX_TIMERS but do have
|
|
// GETTIMEOFDAY, which is still preferable to std::clock()
|
|
#include <stdexcept>
|
|
#include <limits>
|
|
#include <sys/time.h>
|
|
|
|
namespace util
|
|
{
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// high_resolution_timer
|
|
// A timer object measures elapsed time.
|
|
//
|
|
// Implemented with gettimeofday() for platforms that support it,
|
|
// such as Darwin (OS X) but do not support the previous options.
|
|
//
|
|
// Copyright (c) 2009 Edward Grace
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////
|
|
class high_resolution_timer
|
|
{
|
|
private:
|
|
template <typename U>
|
|
static inline double unsigned_diff(const U &a, const U &b)
|
|
{
|
|
if (a > b)
|
|
return static_cast<double>(a-b);
|
|
return -static_cast<double>(b-a);
|
|
}
|
|
|
|
// @brief Return the difference between two timeval types.
|
|
//
|
|
// @param t1 The most recent timeval.
|
|
// @param t0 The historical timeval.
|
|
//
|
|
// @return The difference between the two in seconds.
|
|
double elapsed(const timeval &t1, const timeval &t0) const
|
|
{
|
|
if (t1.tv_sec == t0.tv_sec)
|
|
return unsigned_diff(t1.tv_usec,t0.tv_usec) * 1e-6;
|
|
|
|
// We do it this way as the result of the difference of the
|
|
// microseconds can be negative if the clock is implemented so
|
|
// that the seconds timer increases in large steps.
|
|
//
|
|
// Naive subtraction of the unsigned types and conversion to
|
|
// double can wreak havoc!
|
|
return unsigned_diff(t1.tv_sec,t0.tv_sec) +
|
|
unsigned_diff(t1.tv_usec,t0.tv_usec) * 1e-6;
|
|
}
|
|
|
|
public:
|
|
high_resolution_timer()
|
|
{
|
|
start_time.tv_sec = 0;
|
|
start_time.tv_usec = 0;
|
|
|
|
restart();
|
|
}
|
|
|
|
high_resolution_timer(double t)
|
|
{
|
|
start_time.tv_sec = time_t(t);
|
|
start_time.tv_usec = (t - start_time.tv_sec) * 1e6;
|
|
}
|
|
|
|
high_resolution_timer(high_resolution_timer const& rhs)
|
|
: start_time(rhs.start_time)
|
|
{
|
|
}
|
|
|
|
static double now()
|
|
{
|
|
// Under some implementations gettimeofday() will always
|
|
// return zero. If it returns anything else however then
|
|
// we accept this as evidence of an error. Note we are
|
|
// not assuming that -1 explicitly indicates the error
|
|
// condition, just that non zero is indicative of the
|
|
// error.
|
|
timeval now;
|
|
if (gettimeofday(&now, NULL))
|
|
boost::throw_exception(std::runtime_error("Couldn't get current time"));
|
|
return double(now.tv_sec) + double(now.tv_usec) * 1e-6;
|
|
}
|
|
|
|
void restart()
|
|
{
|
|
if (gettimeofday(&start_time, NULL))
|
|
boost::throw_exception(std::runtime_error("Couldn't initialize start_time"));
|
|
}
|
|
|
|
double elapsed() const // return elapsed time in seconds
|
|
{
|
|
timeval now;
|
|
if (gettimeofday(&now, NULL))
|
|
boost::throw_exception(std::runtime_error("Couldn't get current time"));
|
|
return elapsed(now,start_time);
|
|
}
|
|
|
|
double elapsed_max() const // return estimated maximum value for elapsed()
|
|
{
|
|
return double((std::numeric_limits<time_t>::max)() - start_time.tv_sec);
|
|
}
|
|
|
|
double elapsed_min() const // return minimum value for elapsed()
|
|
{
|
|
// On systems without an explicit clock_getres or similar
|
|
// we can only estimate an upper bound on the resolution
|
|
// by repeatedly calling the gettimeofday function. This
|
|
// is often likely to be indicative of the true
|
|
// resolution.
|
|
timeval t0, t1;
|
|
double delta(0);
|
|
|
|
if (gettimeofday(&t0, NULL))
|
|
boost::throw_exception(std::runtime_error("Couldn't get resolution."));
|
|
|
|
// Spin around in a tight loop until we observe a change
|
|
// in the reported timer value.
|
|
do {
|
|
if (gettimeofday(&t1, NULL))
|
|
boost::throw_exception(std::runtime_error("Couldn't get resolution."));
|
|
delta = elapsed(t1, t0);
|
|
} while (delta <= 0.0);
|
|
|
|
return delta;
|
|
}
|
|
|
|
private:
|
|
timeval start_time;
|
|
};
|
|
|
|
}
|
|
|
|
#else // BOOST_HAS_GETTIMEOFDAY
|
|
|
|
// For platforms other than Windows or Linux, or not implementing gettimeofday
|
|
// simply fall back to boost::timer
|
|
#include <boost/timer.hpp>
|
|
|
|
namespace util
|
|
{
|
|
struct high_resolution_timer
|
|
: boost::timer
|
|
{
|
|
static double now()
|
|
{
|
|
return double(std::clock());
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#endif // HIGH_RESOLUTION_TIMER_AUG_14_2009_0425PM
|
|
|
|
//
|
|
// $Log: high_resolution_timer.hpp,v $
|
|
// Revision 1.4 2009/08/14 15:28:10 graceej
|
|
// * It is entirely possible for the updating clock to increment the
|
|
// * seconds and *decrement* the microseconds field. Consequently
|
|
// * when subtracting these unsigned microseconds fields a wrap-around
|
|
// * error can occur. For this reason elapsed(t1, t0) is used in a
|
|
// * similar maner to cycle.h this preserves the sign of the
|
|
// * difference.
|
|
//
|
|
|