From: Juri Linkov <juri@jurta.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org, Paul Pogonyshev <pogonyshev@gmx.net>
Subject: Re: very slow archive-mode
Date: Thu, 13 Mar 2008 00:41:14 +0200 [thread overview]
Message-ID: <874pbbblz8.fsf@jurta.org> (raw)
In-Reply-To: <jwvejafpr5m.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Wed, 12 Mar 2008 17:30:49 -0400")
>> I regularly open Java source archive (JAR of several tens of megabytes)
>> in Emacs. Recently I recompiled Emacs from CVS and noticed that process
>> of opening and parsing archive had become times slower (didn't measure
>> precisely, but I guess about 5--10x slowdown is there). Can anyone
>> investigate the problem or just guess what changes caused it? I don't
>> remember when I compiled Emacs previously, I guess it was a couple month
>> old.
>
> I reported a similar problem. I believe set-buffer-multibyte is *a lot*
> slower now, and may even have a time complexity of O(N^2).
Unfortunately, this problem destroyed one my important archive today :-(
A 20-megabyte archive that in Emacs 22 opens within 1 sec, in Emacs 23
froze for several minutes, so I was forced to interrupt its visiting
with C-g. After that, I run a compilation process in another buffer,
that started to automatically save the archive's buffer that was
marked as modified. As a result, the archive file was corrupted
by this automatic saving.
--
Juri Linkov
http://www.jurta.org/emacs/
next prev parent reply other threads:[~2008-03-12 22:41 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-12 20:47 very slow archive-mode Paul Pogonyshev
2008-03-12 21:30 ` Stefan Monnier
2008-03-12 22:41 ` Juri Linkov [this message]
2008-03-13 7:51 ` Kenichi Handa
2008-03-13 15:04 ` Stefan Monnier
2008-03-13 15:08 ` Stefan Monnier
2008-03-14 1:56 ` YAMAMOTO Mitsuharu
2008-03-14 3:43 ` Kenichi Handa
2008-03-14 4:17 ` YAMAMOTO Mitsuharu
2008-03-14 1:03 ` Juri Linkov
2008-03-16 2:23 ` Kenichi Handa
2008-03-16 16:31 ` Juri Linkov
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