On 3/13/12 5:45 PM, Kristján Valur Jónsson wrote:
The reason I originally suggested "wallclock" was because that term is often used to distinguish time
measurements (delta) that show real world time from those showing CPU or Kernel time. "number.crunch() took 2
seconds wallclock time but only 1 second CPU!". The original problem was that time.clock() was
"wallclock" on some platforms but "cpu" on others, IIRC.
But monotonic is probably even better. I agree removing one or the other,
probably wallclock.
K
-----Original Message-----
From: python-dev-bounces+kristjan=ccpgames....@python.org
[mailto:python-dev-bounces+kristjan=ccpgames....@python.org] On Behalf Of Guido
van Rossum
Sent: 13. mars 2012 17:27
To: Victor Stinner
Cc: Python Dev
Subject: Re: [Python-Dev] Drop the new time.wallclock() function?
I think wallclock() is an awkward name; in other contexts I've seen "wall clock
time" used to mean the time that a clock on the wall would show, i.e. local time.
This matches definition #1 of http://www.catb.org/jargon/html/W/wall-time.html (while
yours matches
#2 :-).
I agree that it's better to have only one of these. I also think if we offer it
we should always have it -- if none of the implementations are available, I
guess you could fall back on returning time.time(), with some suitable offset
so people don't think it is always the same.
Maybe it could be called realtime()?
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Btw., have you considered virtual machines?
I happen to run windows in Parallels or Virtualbox quite often.
There the "wall clock" stuff notoriously does not work.
It would be good (but difficult?) if the supposed-to-be-accurate
clock could test itself, if it works at all, and replace itself
with a fallback.
In my case, this causes quite a few PyPy tests to fail ;-)
ciao -- Chris
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