STINNER Victor <[email protected]> added the comment:
I closed maybe this issue too quickly. My commit doesn't solve the initial
issue: Python doesn't provide a portable "wallclock" function.
wallclock.patch should be updated to use:
- time.clock() on Windows (use QueryPerformanceCounter)
- or time.clock_gettime(CLOCK_MONOTONIC_RAW) if available
- or time.clock_gettime(CLOCK_MONOTONIC) if available
- or time.time() (which is usually gettimeofday())
Pseudo-code:
wallclock = None
if hasattr(time, 'clock_gettime') and hasattr(time, 'CLOCK_MONOTONIC_RAW'):
# I understood that CLOCK_MONOTONIC_RAW is more reliable
# than CLOCK_MONOTONIC, because CLOCK_MONOTONIC may be adjusted
# by NTP. I don't know if it's correct.
def wallclock():
return time.clock_gettime(CLOCK_MONOTONIC_RAW)
elif hasattr(time, 'clock_gettime') and hasattr(time, 'CLOCK_MONOTONIC'):
def wallclock():
return time.clock_gettime(CLOCK_MONOTONIC)
elif os.name == 'nt':
# define a new function to be able to set its docstring
def wallclock():
return time.clock()
else:
def wallclock():
return time.time()
if wallclock is not None:
wallclock.__doc__ = 'monotonic time'
else:
del wallclock
wallclock() doc should also explain that time.time() may be adjusted by NTP or
manually by the administrator.
--
By the way, it would be nice to expose the precision of time.clock(): it's
1/divisor or 1/CLOCKS_PER_SEC on Windows, 1/CLOCKS_PER_SEC on UNIX.
----------
resolution: fixed ->
status: closed -> open
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<http://bugs.python.org/issue10278>
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