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


From: Andreas Politz
Subject: bug#14776: 24.3.50; [PATCH] parse-time-string performance
Date: Wed, 03 Jul 2013 03:21:09 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

I think parse-time-string's performance can be increased significantly
by the attached patch, which replaces `parse-time-string-chars' with
something more sensible.  This function gets called at least once for
every character of the date being parsed, e.g. ~100,000 times in a 3000
article gnus buffer.

I made a comparisons with 3000 dates extracted from mail articles like
this, which seems to suggest some improvement.  I hope that it is also
correct.

(progn
  (garbage-collect)
  (benchmark 100
             '(dolist (d dates)
                (parse-time-string d))))

status quo: 41.547726s (5.333477s in 28 GCs)
patched   : 10.132069s (0.389833s in 2 GCs)

-ap

Attachment: parse-date.diff.gz
Description: Text Data

In GNU Emacs 24.3.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.20.1)
 of 2013-05-23 on luca
Bzr revision: 112687 address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
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