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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Richard Stallman <rms@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Loading souce Elisp faster
Date: Mon, 25 Feb 2013 10:19:06 -0500	[thread overview]
Message-ID: <jwvip5gtomr.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1U9wT9-0008Ec-H7@fencepost.gnu.org> (Richard Stallman's message of "Mon, 25 Feb 2013 06:43:43 -0500")

>     It used to be the case that compiling one's .emacs was silly because it
>     provided no measurable speed difference.  But nowadays this is not true
>     any more: loading a source Elisp file is significantly slower because it
>     goes through load-with-code-conversion.
> Is the slowdown due to heuristically recognizing the encoding?

The fast path (used by elc) parses the data straight from the file,
whereas the slow path loads the file into a buffer (which includes any
decoding if needed) and only then passes the resulting byte-stream to
the parser.
The difference is definitely noticeable.

> Even changing the default might break things for users.

Indeed.  I think the breakage would be reasonably limited, so I'd be
willing to take this risk, but I'd rather avoid having to go to the end
of the file looking for a coding: cookie.


        Stefan



  reply	other threads:[~2013-02-25 15:19 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-25  1:40 Loading souce Elisp faster Stefan Monnier
2013-02-25  1:53 ` Lennart Borgman
2013-02-25  2:53   ` Stefan Monnier
2013-02-25  2:55     ` Lennart Borgman
2013-02-25  3:57       ` Stefan Monnier
2013-02-25  4:35         ` Stephen J. Turnbull
2013-02-25  4:51           ` Stefan Monnier
2013-02-25  5:24         ` Paul Eggert
2013-02-25  6:12           ` Xue Fuqiao
2013-02-25 15:39           ` Eli Zaretskii
2013-02-25 18:41             ` Paul Eggert
2013-02-26  7:23               ` Werner LEMBERG
2013-02-26  8:48                 ` Andreas Schwab
2013-02-25  5:47         ` Leo Liu
2013-02-25 16:28         ` Ted Zlatanov
2013-02-27  4:18         ` Kenichi Handa
2013-02-27 13:48           ` Stefan Monnier
2013-02-27 14:50             ` Drew Adams
2013-02-27 17:49             ` Werner LEMBERG
2013-02-27 14:28           ` Richard Stallman
2013-02-28 14:10             ` Kenichi Handa
2013-03-01  2:12               ` Richard Stallman
2013-03-02 12:52                 ` Kenichi Handa
2013-03-03  0:35                   ` Richard Stallman
2013-03-10 15:19                 ` handa
2013-03-11  1:19                   ` Richard Stallman
2013-03-15 16:20                   ` handa
2013-03-20  8:15                     ` Kenichi Handa
2013-02-25  7:24 ` Achim Gratz
2013-02-25 11:43 ` Richard Stallman
2013-02-25 15:19   ` Stefan Monnier [this message]
2013-02-25 15:36     ` Drew Adams
2013-02-25 16:09       ` Stefan Monnier
2013-02-25 16:31         ` Lennart Borgman
2013-02-25 18:31           ` Stefan Monnier
2013-02-25 19:20             ` Lennart Borgman
2013-02-25 20:53               ` Stefan Monnier
2013-02-25 20:57                 ` Lennart Borgman
2013-02-25 21:37                   ` Stefan Monnier
2013-02-25 21:57                     ` Lennart Borgman
2013-02-25 23:59                       ` Lennart Borgman
2013-02-26 17:27                         ` Achim Gratz
2013-02-26 21:38                           ` Lennart Borgman
2013-02-26 21:43                             ` Dmitry Gutov
2013-02-26 21:47                               ` Lennart Borgman
2013-02-26  4:54           ` Stephen J. Turnbull
2013-02-26  8:29             ` Ulrich Mueller
2013-02-25 21:51     ` Richard Stallman
2013-02-25 23:54       ` Stefan Monnier
2013-02-25 15:35   ` Drew Adams
2013-02-25 13:33 ` Kenichi Handa
2013-02-25 13:50   ` Xue Fuqiao
2013-02-25 15:35     ` Drew Adams
2013-02-25 15:52     ` Eli Zaretskii
2013-02-25 22:39       ` Xue Fuqiao
2013-02-26  3:48         ` Eli Zaretskii
2013-02-26 10:44           ` Xue Fuqiao
2013-02-26 17:02             ` Eli Zaretskii
2013-02-25 15:35   ` Drew Adams
2013-02-25 16:45 ` David Engster
2013-02-26 12:56   ` Richard Stallman
2013-02-26 16:26     ` David Engster
2013-02-26 20:19       ` Richard Stallman
2013-02-26 21:00         ` David Engster
2013-02-26 21:12           ` Eli Zaretskii
2013-02-26 21:18             ` David Engster
2013-02-26 22:40               ` Xue Fuqiao
2013-02-26 22:51               ` David Engster
2013-02-27  0:44                 ` Drew Adams
2013-02-27  1:22           ` Stefan Monnier
2013-02-27  1:56             ` Lennart Borgman
2013-02-27 14:28             ` Richard Stallman
2013-02-27 15:21               ` Stefan Monnier
2013-02-27 17:21                 ` Lennart Borgman
2013-02-27 18:31             ` Achim Gratz
2013-02-27 18:39               ` Drew Adams
2013-02-27 19:28                 ` Achim Gratz
2013-02-27 22:32                   ` Xue Fuqiao
2013-02-27 18:43               ` Lennart Borgman
2013-02-27  4:49           ` Kenichi Handa
2013-02-27 14:27           ` Richard Stallman
2013-02-26 16:57     ` Eli Zaretskii
2013-02-26 20:19       ` Richard Stallman
2013-02-26 20:45         ` Eli Zaretskii
2013-02-27  2:22     ` Stephen J. Turnbull
2013-02-25 21:12 ` Ivan Kanis
2013-02-25 22:47   ` Glenn Morris
2013-02-25 21:17 ` Barry Warsaw
2013-02-26  7:10   ` Thierry Volpiatto
2013-02-26  7:59 ` Andreas Röhler

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