[Python-Dev] (time) PEP 418 glossary V2

Stephen J. Turnbull stephen at xemacs.org
Wed Apr 25 05:08:39 CEST 2012


On Wed, Apr 25, 2012 at 1:19 AM, Jim Jewett <jimjjewett at gmail.com> wrote:

> I'm still a little fuzzy on *why* it shouldn't count as a monotonic
> clock.

So are the people who say it shouldn't count (unless you're speaking
of the specific implementation on Unix systems, which can go backward
if the admin or NTP decides it should be so).  I think they are in
general mistaking their use case for a general specification, that's
all.  Even Glyph cited "what other people seem to think" in supporting
the usage where "monotonic" implies "high quality" in some informal
sense, although he does have a spec for what high quality means, and
AIUI an API for it in Twisted.

I think we should just accept that "monotonic" is in more or less
common use as a synonym for "high quality", and warn *our* users that
the implementers of such clocks may be working to a different spec.  I
think the revised glossary's description of "monotonic" does that
pretty well.


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