Calculating Elapsed Time
csubich.spam.block at spam.subich.block.com
Wed Dec 7 13:09:03 EST 2005
Fredrik Lundh wrote:
> if I run this on the Windows 2K box I'm sitting at right now, it settles
> at 100 for time.time, and 1789772 for time.clock. on linux, I get 100
> for time.clock instead, and 262144 for time.time.
Aren't the time.clock semantics different on 'nix? I thought, at least
on some 'nix systems, time.clock returned a "cpu time" value that
measured actual computation time, rather than wall-clock time [meaning
stalls in IO don't count].
This is pretty easily confirmed, at least on one particular system
(interactive prompt, so the delay is because of typing):
Python 2.2.3 (#1, Nov 12 2004, 13:02:04)
[GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-42)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import time
>>> (c,t) = (time.clock, time.time)
>>> (nowc, nowt) = (c(), t())
>>> print (c() - nowc, t() - nowt)
So caevat programmer when using time.clock; its meaning is different on
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