/usr/lib/python3/dist-packages/pytest_benchmark/pep418.py is in python3-pytest-benchmark 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from: https://bitbucket.org/haypo/misc/src/tip/python/pep418.py
Implementation of the PEP 418 in pure Python using ctypes.
Functions:
- clock()
- get_clock_info(name)
- monotonic(): not always available
- perf_frequency()
- process_time()
- sleep()
- time()
Constants:
- has_monotonic (bool): True if time.monotonic() is available
"""
# flake8: noqa
# TODO: gethrtime() for Solaris/OpenIndiana
# TODO: call GetSystemTimeAdjustment() to get the resolution
# TODO: other FIXME
import os
import sys
import time as python_time
has_mach_absolute_time = False
has_clock_gettime = False
has_gettimeofday = False
has_ftime = False
has_delay = False
has_libc_time = False
has_libc_clock = False
has_libc_sleep = False
has_GetTickCount64 = False
CLOCK_REALTIME = None
CLOCK_MONOTONIC = None
CLOCK_PROCESS_CPUTIME_ID = None
CLOCK_HIGHRES = None
CLOCK_PROF = None
try:
import ctypes
import ctypes.util
from ctypes import byref, POINTER
except ImportError as err:
pass
else:
def ctypes_oserror():
errno = ctypes.get_errno()
message = os.strerror(errno)
return OSError(errno, message)
time_t = ctypes.c_long
if os.name == "nt":
from ctypes.wintypes import BOOL, DWORD, HANDLE, FILETIME
from ctypes import windll
LARGEINTEGER = ctypes.c_int64
LARGEINTEGER_p = POINTER(LARGEINTEGER)
FILETIME_p = POINTER(FILETIME)
ULONGLONG = ctypes.c_uint64
def ctypes_winerror():
errno = ctypes.get_errno()
message = os.strerror(errno)
return WindowsError(errno, message)
_QueryPerformanceFrequency = windll.kernel32.QueryPerformanceFrequency
_QueryPerformanceFrequency.restype = BOOL
_QueryPerformanceFrequency.argtypes = (LARGEINTEGER_p,)
def QueryPerformanceFrequency():
frequency = LARGEINTEGER()
ok = _QueryPerformanceFrequency(byref(frequency))
if not ok:
raise ctypes_winerror()
return int(frequency.value)
_QueryPerformanceCounter = windll.kernel32.QueryPerformanceCounter
_QueryPerformanceCounter.restype = BOOL
_QueryPerformanceCounter.argtypes = (LARGEINTEGER_p,)
def QueryPerformanceCounter():
frequency = LARGEINTEGER()
ok = _QueryPerformanceCounter(byref(frequency))
if not ok:
raise ctypes_winerror()
return int(frequency.value)
GetTickCount = windll.kernel32.GetTickCount
GetTickCount.restype = DWORD
GetTickCount.argtypes = ()
if hasattr(windll.kernel32, 'GetTickCount64'):
GetTickCount64 = windll.kernel32.GetTickCount64
GetTickCount64.restype = ULONGLONG
GetTickCount64.argtypes = ()
has_GetTickCount64 = True
GetCurrentProcess = windll.kernel32.GetCurrentProcess
GetCurrentProcess.argtypes = ()
GetCurrentProcess.restype = HANDLE
_GetProcessTimes = windll.kernel32.GetProcessTimes
_GetProcessTimes.argtypes = (HANDLE, FILETIME_p, FILETIME_p, FILETIME_p, FILETIME_p)
_GetProcessTimes.restype = BOOL
def filetime2py(obj):
return (obj.dwHighDateTime << 32) + obj.dwLowDateTime
def GetProcessTimes(handle):
creation_time = FILETIME()
exit_time = FILETIME()
kernel_time = FILETIME()
user_time = FILETIME()
ok = _GetProcessTimes(handle,
byref(creation_time), byref(exit_time),
byref(kernel_time), byref(user_time))
if not ok:
raise ctypes_winerror()
return (filetime2py(creation_time), filetime2py(exit_time),
filetime2py(kernel_time), filetime2py(user_time))
_GetSystemTimeAsFileTime = windll.kernel32.GetSystemTimeAsFileTime
_GetSystemTimeAsFileTime.argtypes = (FILETIME_p,)
_GetSystemTimeAsFileTime.restype = None
def GetSystemTimeAsFileTime():
system_time = FILETIME()
_GetSystemTimeAsFileTime(byref(system_time))
return filetime2py(system_time)
libc_name = ctypes.util.find_library('c')
if libc_name:
libc = ctypes.CDLL(libc_name, use_errno=True)
clock_t = ctypes.c_ulong
if sys.platform == 'darwin':
mach_absolute_time = libc.mach_absolute_time
mach_absolute_time.argtypes = ()
mach_absolute_time.restype = ctypes.c_uint64
has_mach_absolute_time = True
class mach_timebase_info_data_t(ctypes.Structure):
_fields_ = (
('numer', ctypes.c_uint32),
('denom', ctypes.c_uint32),
)
mach_timebase_info_data_p = POINTER(mach_timebase_info_data_t)
_mach_timebase_info = libc.mach_timebase_info
_mach_timebase_info.argtypes = (mach_timebase_info_data_p,)
_mach_timebase_info.restype = ctypes.c_int
def mach_timebase_info():
timebase = mach_timebase_info_data_t()
_mach_timebase_info(byref(timebase))
return (timebase.numer, timebase.denom)
_libc_clock = libc.clock
_libc_clock.argtypes = ()
_libc_clock.restype = clock_t
has_libc_clock = True
if hasattr(libc, 'sleep'):
_libc_sleep = libc.sleep
_libc_sleep.argtypes = (ctypes.c_uint,)
_libc_sleep.restype = ctypes.c_uint
has_libc_sleep = True
if hasattr(libc, 'gettimeofday'):
class timeval(ctypes.Structure):
_fields_ = (
('tv_sec', time_t),
('tv_usec', ctypes.c_long),
)
timeval_p = POINTER(timeval)
timezone_p = ctypes.c_void_p
_gettimeofday = libc.gettimeofday
# FIXME: some platforms only expect one argument
_gettimeofday.argtypes = (timeval_p, timezone_p)
_gettimeofday.restype = ctypes.c_int
def gettimeofday():
tv = timeval()
err = _gettimeofday(byref(tv), None)
if err:
raise ctypes_oserror()
return tv
has_gettimeofday = True
time_t_p = POINTER(time_t)
if hasattr(libc, 'time'):
_libc__time = libc.time
_libc__time.argtypes = (time_t_p,)
_libc__time.restype = time_t
def _libc_time():
return _libc__time(None)
has_libc_time = True
if sys.platform.startswith(("freebsd", "openbsd")):
librt_name = libc_name
else:
librt_name = ctypes.util.find_library('rt')
if librt_name:
librt = ctypes.CDLL(librt_name, use_errno=True)
if hasattr(librt, 'clock_gettime'):
clockid_t = ctypes.c_int
class timespec(ctypes.Structure):
_fields_ = (
('tv_sec', time_t),
('tv_nsec', ctypes.c_long),
)
timespec_p = POINTER(timespec)
_clock_gettime = librt.clock_gettime
_clock_gettime.argtypes = (clockid_t, timespec_p)
_clock_gettime.restype = ctypes.c_int
def clock_gettime(clk_id):
ts = timespec()
err = _clock_gettime(clk_id, byref(ts))
if err:
raise ctypes_oserror()
return ts.tv_sec + ts.tv_nsec * 1e-9
has_clock_gettime = True
_clock_settime = librt.clock_settime
_clock_settime.argtypes = (clockid_t, timespec_p)
_clock_settime.restype = ctypes.c_int
def clock_settime(clk_id, value):
ts = timespec()
ts.tv_sec = int(value)
ts.tv_nsec = int(float(abs(value)) % 1.0 * 1e9)
err = _clock_settime(clk_id, byref(ts))
if err:
raise ctypes_oserror()
return ts.tv_sec + ts.tv_nsec * 1e-9
_clock_getres = librt.clock_getres
_clock_getres.argtypes = (clockid_t, timespec_p)
_clock_getres.restype = ctypes.c_int
def clock_getres(clk_id):
ts = timespec()
err = _clock_getres(clk_id, byref(ts))
if err:
raise ctypes_oserror()
return ts.tv_sec + ts.tv_nsec * 1e-9
if sys.platform.startswith("linux"):
CLOCK_REALTIME = 0
CLOCK_MONOTONIC = 1
CLOCK_PROCESS_CPUTIME_ID = 2
elif sys.platform.startswith("freebsd"):
CLOCK_REALTIME = 0
CLOCK_PROF = 2
CLOCK_MONOTONIC = 4
elif sys.platform.startswith("openbsd"):
CLOCK_REALTIME = 0
CLOCK_MONOTONIC = 3
elif sys.platform.startswith("sunos"):
CLOCK_REALTIME = 3
CLOCK_HIGHRES = 4
# clock_gettime(CLOCK_PROCESS_CPUTIME_ID) fails with errno 22
# on OpenSolaris
# CLOCK_PROCESS_CPUTIME_ID = 5
def _clock_gettime_info(use_info, clk_id):
value = clock_gettime(clk_id)
if use_info:
name = {
CLOCK_MONOTONIC: 'CLOCK_MONOTONIC',
CLOCK_PROF: 'CLOCK_PROF',
CLOCK_HIGHRES: 'CLOCK_HIGHRES',
CLOCK_PROCESS_CPUTIME_ID: 'CLOCK_PROCESS_CPUTIME_ID',
CLOCK_REALTIME: 'CLOCK_REALTIME',
}[clk_id]
try:
resolution = clock_getres(clk_id)
except OSError:
resolution = 1e-9
info = {
'implementation': 'clock_gettime(%s)' % name,
'resolution': resolution,
}
if clk_id in (CLOCK_MONOTONIC, CLOCK_PROF, CLOCK_HIGHRES, CLOCK_PROCESS_CPUTIME_ID):
info['monotonic'] = True
info['adjustable'] = False
elif clk_id in (CLOCK_REALTIME,):
info['monotonic'] = False
info['adjustable'] = True
else:
info = None
return (value, info)
has_monotonic = False
if os.name == 'nt':
# GetTickCount64() requires Windows Vista, Server 2008 or later
if has_GetTickCount64:
def _monotonic(use_info):
value = GetTickCount64() * 1e-3
if use_info:
info = {
'implementation': "GetTickCount64()",
"monotonic": True,
"resolution": 1e-3,
"adjustable": False,
}
# FIXME: call GetSystemTimeAdjustment() to get the resolution
else:
info = None
return (value, info)
has_monotonic = True
else:
def _monotonic(use_info):
ticks = GetTickCount()
if ticks < _monotonic.last:
# Integer overflow detected
_monotonic.delta += 2**32
_monotonic.last = ticks
value = (ticks + _monotonic.delta) * 1e-3
if use_info:
info = {
'implementation': "GetTickCount()",
"monotonic": True,
"resolution": 1e-3,
"adjustable": False,
}
# FIXME: call GetSystemTimeAdjustment() to get the resolution
else:
info = None
return (value, info)
_monotonic.last = 0
_monotonic.delta = 0
has_monotonic = True
elif has_mach_absolute_time:
def _monotonic(use_info):
if _monotonic.factor is None:
timebase = mach_timebase_info()
_monotonic.factor = timebase[0] / timebase[1] * 1e-9
value = mach_absolute_time() * _monotonic.factor
if use_info:
info = {
'implementation': "mach_absolute_time()",
'resolution': _monotonic.factor,
'monotonic': True,
'adjustable': False,
}
else:
info = None
return (value, info)
_monotonic.factor = None
has_monotonic = True
elif has_clock_gettime and CLOCK_HIGHRES is not None:
def _monotonic(use_info):
return _clock_gettime_info(use_info, CLOCK_HIGHRES)
has_monotonic = True
elif has_clock_gettime and CLOCK_MONOTONIC is not None:
def _monotonic(use_info):
return _clock_gettime_info(use_info, CLOCK_MONOTONIC)
has_monotonic = True
if has_monotonic:
def monotonic():
return _monotonic(False)[0]
def _perf_counter(use_info):
info = None
if _perf_counter.use_performance_counter:
if _perf_counter.performance_frequency is None:
value, info = _win_perf_counter(use_info)
if value is not None:
return (value, info)
if _perf_counter.use_monotonic:
# The monotonic clock is preferred over the system time
try:
return _monotonic(use_info)
except (OSError, WindowsError):
_perf_counter.use_monotonic = False
return _time(use_info)
_perf_counter.use_performance_counter = (os.name == 'nt')
if _perf_counter.use_performance_counter:
_perf_counter.performance_frequency = None
_perf_counter.use_monotonic = has_monotonic
def perf_counter():
return _perf_counter(False)[0]
if os.name == 'nt':
def _process_time(use_info):
handle = GetCurrentProcess()
process_times = GetProcessTimes(handle)
value = (process_times[2] + process_times[3]) * 1e-7
if use_info:
info = {
"implementation": "GetProcessTimes()",
"resolution": 1e-7,
"monotonic": True,
"adjustable": False,
# FIXME: call GetSystemTimeAdjustment() to get the resolution
}
else:
info = None
return (value, info)
else:
import os
try:
import resource
except ImportError:
has_resource = False
else:
has_resource = True
def _process_time(use_info):
info = None
if _process_time.clock_id is not None:
try:
return _clock_gettime_info(use_info, _process_time.clock_id)
except OSError:
_process_time.clock_id = None
if _process_time.use_getrusage:
try:
usage = resource.getrusage(resource.RUSAGE_SELF)
value = usage[0] + usage[1]
except OSError:
_process_time.use_getrusage = False
else:
if use_info:
info = {
"implementation": "getrusage(RUSAGE_SELF)",
"resolution": 1e-6,
"monotonic": True,
"adjustable": False,
}
return (value, info)
if _process_time.use_times:
try:
times = os.times()
value = times[0] + times[1]
except OSError:
_process_time.use_getrusage = False
else:
if use_info:
try:
ticks_per_second = os.sysconf("SC_CLK_TCK")
except ValueError:
ticks_per_second = 60 # FIXME: get HZ constant
info = {
"implementation": "times()",
"resolution": 1.0 / ticks_per_second,
"monotonic": True,
"adjustable": False,
}
return (value, info)
return _libc_clock_info(use_info)
if has_clock_gettime and CLOCK_PROCESS_CPUTIME_ID is not None:
_process_time.clock_id = CLOCK_PROCESS_CPUTIME_ID
elif has_clock_gettime and CLOCK_PROF is not None:
_process_time.clock_id = CLOCK_PROF
else:
_process_time.clock_id = None
_process_time.use_getrusage = has_resource
# On OS/2, only the 5th field of os.times() is set, others are zeros
_process_time.use_times = (hasattr(os, 'times') and os.name != 'os2')
def process_time():
return _process_time(False)[0]
if os.name == "nt":
def _time(use_info):
value = GetSystemTimeAsFileTime() * 1e-7
if use_info:
info = {
'implementation': 'GetSystemTimeAsFileTime',
'resolution': 1e-7,
'monotonic': False,
# FIXME: call GetSystemTimeAdjustment() to get the resolution
# and adjustable
}
else:
info = None
return (value, info)
else:
def _time(use_info):
info = None
if has_clock_gettime and CLOCK_REALTIME is not None:
try:
return _clock_gettime_info(use_info, CLOCK_REALTIME)
except OSError:
# CLOCK_REALTIME is not supported (unlikely)
pass
if has_gettimeofday:
try:
tv = gettimeofday()
except OSError:
# gettimeofday() should not fail
pass
else:
if use_info:
info = {
'monotonic': False,
"implementation": "gettimeofday()",
"resolution": 1e-6,
'monotonic': False,
'adjustable': True,
}
value = tv.tv_sec + tv.tv_usec * 1e-6
return (value, info)
# FIXME: implement ftime()
if has_ftime:
if use_info:
info = {
"implementation": "ftime()",
"resolution": 1e-3,
'monotonic': False,
'adjustable': True,
}
value = ftime()
elif has_libc_time:
if use_info:
info = {
"implementation": "time()",
"resolution": 1.0,
'monotonic': False,
'adjustable': True,
}
value = float(_libc_time())
else:
if use_info:
info = {
"implementation": "time.time()",
'monotonic': False,
'adjustable': True,
}
if os.name == "nt":
# On Windows, time.time() uses ftime()
info["resolution"] = 1e-3
else:
# guess that time.time() uses gettimeofday()
info["resolution"] = 1e-6
value = python_time.time()
return (value, info)
def time():
return _time(False)[0]
try:
import select
except ImportError:
has_select = False
else:
# FIXME: On Windows, select.select([], [], [], seconds) fails with
# select.error(10093)
has_select = (hasattr(select, "select") and os.name != "nt")
if has_select:
def _sleep(seconds):
return select.select([], [], [], seconds)
elif has_delay:
def _sleep(seconds):
milliseconds = int(seconds * 1000)
# FIXME
delay(milliseconds)
#elif os.name == "nt":
# def _sleep(seconds):
# milliseconds = int(seconds * 1000)
# # FIXME: use ctypes
# win32api.ResetEvent(hInterruptEvent);
# win32api.WaitForSingleObject(sleep.sigint_event, milliseconds)
#
# sleep.sigint_event = win32api.CreateEvent(NULL, TRUE, FALSE, FALSE)
# # SetEvent(sleep.sigint_event) will be called by the signal handler of SIGINT
elif os.name == "os2":
def _sleep(seconds):
milliseconds = int(seconds * 1000)
# FIXME
DosSleep(milliseconds)
elif has_libc_sleep:
def _sleep(seconds):
seconds = int(seconds)
_libc_sleep(seconds)
else:
def _sleep(seconds):
python_time.sleep(seconds)
def sleep(seconds):
if seconds < 0:
raise ValueError("sleep length must be non-negative")
_sleep(seconds)
def _libc_clock_info(use_info):
if use_info:
info = {
'implementation': 'clock()',
'resolution': 1.0,
# FIXME: 'resolution': 1.0 / CLOCKS_PER_SEC,
'monotonic': True,
'adjustable': False,
}
if os.name != "nt":
info['monotonic'] = True
else:
info = None
if has_libc_clock:
value = _libc_clock()
if use_info:
info['implementation'] = 'clock()'
else:
value = python_time.clock()
if use_info:
info['implementation'] = 'time.clock()'
return (value, info)
def _win_perf_counter(use_info):
if _win_perf_counter.perf_frequency is None:
try:
_win_perf_counter.perf_frequency = float(QueryPerformanceFrequency())
except WindowsError:
# QueryPerformanceFrequency() fails if the installed
# hardware does not support a high-resolution performance
# counter
return (None, None)
value = QueryPerformanceCounter() / _win_perf_counter.perf_frequency
if use_info:
info = {
'implementation': 'QueryPerformanceCounter',
'resolution': 1.0 / _win_perf_counter.perf_frequency,
'monotonic': True,
'adjustable': False,
}
else:
info = None
return (value, info)
_win_perf_counter.perf_frequency = None
if os.name == 'nt':
def _clock(use_info):
info = None
if _clock.use_performance_counter:
value, info = _win_perf_counter(use_info)
if value is not None:
return (value, info)
return _libc_clock_info(use_info)
_clock.use_performance_counter = True
else:
def _clock(use_info):
return _libc_clock_info(use_info)
def clock():
return _clock(False)[0]
class clock_info(object):
def __init__(self, implementation, monotonic, adjustable, resolution):
self.implementation = implementation
self.monotonic = monotonic
self.adjustable = adjustable
self.resolution = resolution
def __repr__(self):
return (
'clockinfo(adjustable=%s, implementation=%r, monotonic=%s, resolution=%s'
% (self.adjustable, self.implementation, self.monotonic, self.resolution))
def get_clock_info(name):
if name == 'clock':
info = _clock(True)[1]
elif name == 'perf_counter':
info = _perf_counter(True)[1]
elif name == 'process_time':
info = _process_time(True)[1]
elif name == 'time':
info = _time(True)[1]
elif has_monotonic and name == 'monotonic':
info = _monotonic(True)[1]
else:
raise ValueError("unknown clock: %s" % name)
return clock_info(**info)
if __name__ == "__main__":
from errno import EPERM
import threading
import unittest
class TestPEP418(unittest.TestCase):
if not hasattr(unittest.TestCase, 'assertIsInstance'):
# Python < 2.7 or Python < 3.2
def assertIsInstance(self, obj, klass):
self.assertTrue(isinstance(obj, klass))
def assertGreater(self, a, b):
self.assertTrue(a > b)
def assertLess(self, a, b):
self.assertTrue(a < b)
def assertLessEqual(self, a, b):
self.assertTrue(a <= b)
def assertAlmostEqual(self, first, second, delta):
self.assertTrue(abs(first - second) <= delta)
def test_clock(self):
clock()
info = get_clock_info('clock')
self.assertEqual(info.monotonic, True)
self.assertEqual(info.adjustable, False)
def test_get_clock_info(self):
clocks = ['clock', 'perf_counter', 'process_time', 'time']
if has_monotonic:
clocks.append('monotonic')
for name in clocks:
info = get_clock_info(name)
self.assertIsInstance(info.implementation, str)
self.assertNotEqual(info.implementation, '')
self.assertIsInstance(info.monotonic, bool)
self.assertIsInstance(info.resolution, float)
# 0 < resolution <= 1.0
self.assertGreater(info.resolution, 0)
self.assertLessEqual(info.resolution, 1)
self.assertIsInstance(info.adjustable, bool)
self.assertRaises(ValueError, get_clock_info, 'xxx')
if not has_monotonic:
print("Skip test_monotonic: need time.monotonic")
else:
def test_monotonic(self):
t1 = monotonic()
python_time.sleep(0.1)
t2 = monotonic()
dt = t2 - t1
self.assertGreater(t2, t1)
self.assertAlmostEqual(dt, 0.1, delta=0.2)
info = get_clock_info('monotonic')
self.assertEqual(info.monotonic, True)
self.assertEqual(info.adjustable, False)
if not has_monotonic or not has_clock_gettime:
if not has_monotonic:
print('Skip test_monotonic_settime: need time.monotonic')
elif not has_clock_gettime:
print('Skip test_monotonic_settime: need time.clock_settime')
else:
def test_monotonic_settime(self):
t1 = monotonic()
realtime = clock_gettime(CLOCK_REALTIME)
# jump backward with an offset of 1 hour
try:
clock_settime(CLOCK_REALTIME, realtime - 3600)
except OSError as err:
if err.errno == EPERM:
if hasattr(unittest, 'SkipTest'):
raise unittest.SkipTest(str(err))
else:
print("Skip test_monotonic_settime: %s" % err)
return
else:
raise
t2 = monotonic()
clock_settime(CLOCK_REALTIME, realtime)
# monotonic must not be affected by system clock updates
self.assertGreaterEqual(t2, t1)
def test_perf_counter(self):
perf_counter()
def test_process_time(self):
start = process_time()
python_time.sleep(0.1)
stop = process_time()
self.assertLess(stop - start, 0.01)
info = get_clock_info('process_time')
self.assertEqual(info.monotonic, True)
self.assertEqual(info.adjustable, False)
def test_process_time_threads(self):
class BusyThread(threading.Thread):
def run(self):
while not self.stop:
pass
thread = BusyThread()
thread.stop = False
t1 = process_time()
thread.start()
sleep(0.2)
t2 = process_time()
thread.stop = True
thread.join()
self.assertGreater(t2 - t1, 0.1)
def test_sleep(self):
self.assertRaises(ValueError, sleep, -2)
self.assertRaises(ValueError, sleep, -1)
sleep(1.2)
def test_time(self):
value = time()
self.assertIsInstance(value, float)
info = get_clock_info('time')
self.assertEqual(info.monotonic, False)
self.assertEqual(info.adjustable, True)
if True:
from pprint import pprint
print("clock: %s" % clock())
if has_monotonic:
print("monotonic: %s" % monotonic())
else:
print("monotonic: <not available>")
print("perf_counter: %s" % perf_counter())
print("process_time: %s" % process_time())
print("time: %s" % time())
clocks = ['clock', 'perf_counter', 'process_time', 'time']
if has_monotonic:
clocks.append('monotonic')
pprint(dict((name, get_clock_info(name)) for name in clocks))
unittest.main()
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