From: "Drew Adams" <drew.adams@oracle.com>
To: "'Ludwig, Mark'" <ludwig.mark@siemens.com>, <help-gnu-emacs@gnu.org>
Subject: RE: Performance problems (CPU 100%) with NULs in files
Date: Wed, 21 Sep 2011 21:30:57 -0700 [thread overview]
Message-ID: <3BB0836868D54090A9A9930F81EFF891@us.oracle.com> (raw)
In-Reply-To: <BC5672F8AD4C054BAF167C9801500D1A510C1869@USSLMMBX003.net.plm.eds.com>
> What happens is that as I scroll through the file, when
> the NULs are visible, Emacs gets into some intensive
> processing for a long time (minutes, sometimes!). It
> eventually unwinds and repaints the display, but any
> movement of point sends it into this loop again. I have
> found that M-< or M-> will quickly reposition away from
> the problem (assuming the beginning and/or end of the file
> do not contain NULs). Most other movement operations send
> it into the loop.
>
> I understand about encodings, and have messed around with
> forcing it into us-ascii, but it appears not to be related
> to this CPU consumption problem. Does anyone know how to
> solve this? I'll file a bug report if this is a legitimate bug.
> I'm just concerned that it's a "feature" of some sort, though
> I hope not.
Are you using the development version of Emacs (aka Emacs 24)?
If so, I have no idea whether this will help or help you find the problem, but
you might try doing this to see if it makes a difference:
(setq-default bidi-display-reordering nil)
Others might have helpful suggestions. In any case, especially if you have a
reproducible case starting from `emacs -Q' (no init file), I'd suggest reporting
a bug. Emacs developers will be able to tell you whether there is really a bug.
Whatever Emacs version you are using, this sounds like a regression wrt the
behavior you report with an older version.
next prev parent reply other threads:[~2011-09-22 4:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-21 21:08 Performance problems (CPU 100%) with NULs in files Ludwig, Mark
2011-09-22 4:30 ` Drew Adams [this message]
2011-09-22 13:00 ` Ludwig, Mark
2011-09-22 5:44 ` Eli Zaretskii
2011-09-22 12:58 ` Ludwig, Mark
2011-09-24 0:20 ` Ludwig, Mark
2011-09-24 0:50 ` Le Wang
2011-09-24 6:04 ` Eli Zaretskii
2011-09-24 13:32 ` Ludwig, Mark
2011-09-24 14:15 ` Eli Zaretskii
2011-09-22 6:09 ` XeCycle
2011-09-22 12:58 ` Ludwig, Mark
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