From: David De La Harpe Golden <david@harpegolden.net>
To: Alan Mackenzie <acm@muc.de>
Cc: Eli Zaretskii <eliz@gnu.org>,
Lennart Borgman <lennart.borgman@gmail.com>,
monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: Emacs 23.0 is much slower starting than Emacs 22.3
Date: Fri, 24 Oct 2008 15:32:30 +0100 [thread overview]
Message-ID: <4901DC7E.9000202@harpegolden.net> (raw)
In-Reply-To: <20081024112104.GA3246@muc.de>
Alan Mackenzie wrote:
> However, the current function isn't that slow. I timed it for 100
> iterations on a file 2,927,889 bytes big. It's taking 0.72s for this
> file, i.e. about 0.25s per megabyte, and that's on my 1.2 GHz Athlon.
>
> So on emacs/src's 118 files.c, total size 8772802, that function would
> take only 2.5s, again, on my Athlon. On your machine it would be ~0.5s.
>
> Besides, in my original measurements, I was executing the same CC Mode
> in Emacs 22 and Emacs 23.
>
> c-neutralize-syntax-in-CPP isn't the problem.
>
Probably not, or at least not the slowdown you're seeing i.e. your
relative emacs22/23 problem. N.B. It wasn't intended as a slight - I do
appreciate C is a relative pain to parse, syntax-highlight and deal with
in general, I'm_ not_ saying c-mode's apparently associated overhead is
necessarily unreasonable, but it may explain why stuff I was generally
doing in emacs day-to-day seemed to load a little bit faster than this
particular test case (if you recall, I was surprised at the result) - I
relatively seldom edit c files! But c-mode as a whole _does_ account
for a significant chunk of the startup time on the 180 .c files I was
testing with:
time emacs -l fftest.el -f kill-emacs
with in .emacs a sneaky
(setq auto-mode-alist (cons (cons "\\.c\\'" 'text-mode) auto-mode-alist))
emacs c-mode realtime
22 on 4.951
23 on 7.388
22 off 2.830
23 off 4.089
next prev parent reply other threads:[~2008-10-24 14:32 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-22 9:11 Emacs 23.0 is much slower starting than Emacs 22.3 Alan Mackenzie
2008-10-22 13:23 ` Stefan Monnier
2008-10-22 13:55 ` John covici
2008-10-22 15:14 ` Alan Mackenzie
2008-10-22 16:46 ` David De La Harpe Golden
2008-10-22 21:12 ` Alan Mackenzie
2008-10-22 21:19 ` Eli Zaretskii
2008-10-23 9:21 ` Alan Mackenzie
2008-10-23 21:53 ` Eli Zaretskii
2008-10-23 6:53 ` David De La Harpe Golden
2008-10-23 9:09 ` Alan Mackenzie
2008-10-23 16:57 ` David De La Harpe Golden
2008-10-23 21:52 ` Eli Zaretskii
2008-10-23 22:33 ` Lennart Borgman
2008-10-24 9:26 ` Eli Zaretskii
2008-10-23 22:47 ` David De La Harpe Golden
2008-10-23 23:12 ` Lennart Borgman
2008-10-23 23:54 ` Lennart Borgman
2008-10-24 9:51 ` Eli Zaretskii
2008-10-24 13:58 ` David De La Harpe Golden
2008-10-24 15:44 ` Lennart Borgman
2008-10-24 16:24 ` Chong Yidong
2008-10-24 16:48 ` Eli Zaretskii
2008-10-24 16:45 ` David De La Harpe Golden
2008-10-24 16:53 ` Eli Zaretskii
2008-10-25 2:01 ` Richard M. Stallman
2008-10-25 3:38 ` David De La Harpe Golden
2008-10-24 0:13 ` David De La Harpe Golden
2008-10-24 0:59 ` Lennart Borgman
2008-10-24 1:58 ` David De La Harpe Golden
2008-10-24 1:44 ` David De La Harpe Golden
2008-10-24 9:57 ` Eli Zaretskii
2008-10-24 15:00 ` David De La Harpe Golden
2008-10-24 11:21 ` Alan Mackenzie
2008-10-24 14:32 ` David De La Harpe Golden [this message]
2008-10-24 19:28 ` Alan Mackenzie
2008-10-24 19:35 ` David De La Harpe Golden
2008-10-24 4:13 ` Stefan Monnier
2008-10-24 15:19 ` David De La Harpe Golden
2008-10-24 18:42 ` Stefan Monnier
2008-10-24 19:36 ` David De La Harpe Golden
2008-10-24 23:44 ` David De La Harpe Golden
2008-10-25 15:19 ` Stefan Monnier
2008-10-25 17:02 ` David De La Harpe Golden
2008-10-24 9:52 ` Eli Zaretskii
2008-10-24 9:35 ` Eli Zaretskii
2008-10-24 9:30 ` Eli Zaretskii
2008-10-23 1:29 ` Miles Bader
2008-10-23 9:06 ` Alan Mackenzie
2008-10-22 18:26 ` Eli Zaretskii
2008-10-22 21:40 ` Alan Mackenzie
2008-10-22 22:09 ` Eli Zaretskii
2008-10-22 21:02 ` Richard M. Stallman
2008-10-24 11:59 ` Emacs 23.0 is much slower than Emacs 22.3. Maybe it's the garbage collector Alan Mackenzie
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