From: Richard Stallman <rms@gnu.org>
Cc: romain@orebokech.com, emacs-devel@gnu.org
Subject: Re: Very long lines in shell-mode
Date: Wed, 06 Dec 2006 23:59:33 -0500 [thread overview]
Message-ID: <E1GsBM5-00026X-Jm@fencepost.gnu.org> (raw)
In-Reply-To: <jwvejrcc336.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Wed, 06 Dec 2006 13:10:49 -0500)
Most likely the 2MB line will be inserted in the buffer in many little
chunks of maybe 4KB or so: for each chunk font-lock may decide to refontify
the whole line. Each fontification step takes time proportional to the
length of the line, so you get O(n^2) behavior.
And this is without even considering the regexps involved which may very
likely add a factor of n to that.
Maybe for such cases, font-lock should have a "sanity check" and either not
fontify the line at all, or fontify only a part of it at a time.
A possible simple solution: in Shell mode, don't fontify a line that
doesn't end in a newline. If that solves the problem, it would be
simple enough to install now.
next prev parent reply other threads:[~2006-12-07 4:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-06 17:44 Very long lines in shell-mode Romain Francoise
2006-12-06 18:10 ` Stefan Monnier
2006-12-07 4:59 ` Richard Stallman [this message]
2006-12-07 9:23 ` Kim F. Storm
2006-12-08 5:04 ` Richard Stallman
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