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bug#14776: 24.3.50; [PATCH] parse-time-string performance


From: Lars Magne Ingebrigtsen
Subject: bug#14776: 24.3.50; [PATCH] parse-time-string performance
Date: Thu, 04 Jul 2013 23:15:11 +0200
User-agent: Gnus/5.130008 (Ma Gnus v0.8) Emacs/24.3.50 (gnu/linux)

Andreas Politz <address@hidden> writes:

>> (benchmark-elapse (dotimes (i 10000) (parse-time-string "Thu, 04 Jul
>> 2013 20:06:00 +0200")))
>> => 1.120856647
>
> => 0.215108395
> ;-O

Wow, that's a pretty impressive speed-up.  I do see one issue, though --
it doesn't parse 2-digit years?  That's a requirement.

Anyway, with this large speed-up, I think we should definitely consider
swapping out the current parse-time code with your code.  Could you
collect a bunch of Date headers from the wild and see whether the old
and new versions agree on them all?

> It looks that way, i.e. parse-time-string is pretty simple compared to
> that.  But most Date header I've seen popping up in my mail seem to
> adhere to a strict rfc2822 format anyway, except for the occasional
> non-strict timezone.

Yes, mailers have gotten a lot better about adhering to the RFC2822 date
format the last decade.

-- 
(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/





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