您可以暂时将计时器周期降低到由wPeriodMin返回的值timeGetDevCaps。以下定义了timer_resolution调用timeBeginPeriod和timeEndPeriod函数的上下文管理器。
import timeit
import contextlib
import ctypes
from ctypes import wintypes
winmm = ctypes.WinDLL('winmm')
class TIMECAPS(ctypes.Structure):
_fields_ = (('wPeriodMin', wintypes.UINT),
('wPeriodMax', wintypes.UINT))
def _check_time_err(err, func, args):
if err:
raise WindowsError('%s error %d' % (func.__name__, err))
return args
winmm.timeGetDevCaps.errcheck = _check_time_err
winmm.timeBeginPeriod.errcheck = _check_time_err
winmm.timeEndPeriod.errcheck = _check_time_err
@contextlib.contextmanager
def timer_resolution(msecs=0):
caps = TIMECAPS()
winmm.timeGetDevCaps(ctypes.byref(caps), ctypes.sizeof(caps))
msecs = min(max(msecs, caps.wPeriodMin), caps.wPeriodMax)
winmm.timeBeginPeriod(msecs)
yield
winmm.timeEndPeriod(msecs)
def min_sleep():
setup = 'import time'
stmt = 'time.sleep(0.001)'
return timeit.timeit(stmt, setup, number=1000)
>>> min_sleep()
15.6137827
>>> with timer_resolution(msecs=1): min_sleep()
...
1.2827173000000016
with块之后，将恢复原始计时器分辨率：
>>> min_sleep()
15.6229814
602392714
清零编程群