--- Begin Message ---
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Subject: |
24.1.50; Emacs unusably slow when looking at large files (bidi support at fault) |
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Date: |
Sat, 14 Jul 2012 17:50:51 -0700 |
I'm observing that when some large text files are loaded, emacs slows to
a crawl. As an example, I have a 14MB file open (with emacs -Q). Every
time I do (next-line) or (previous-line) it takes a few seconds. This is
a > 2GHz Core2 machine, so there's no reason for this to happen. 'M-x
benchmark' says that (previous-line) takes >2s each time. I discovered
that if I do (setq bidi-display-reordering nil) then emacs is snappy
again, with previous-line taking <1ms.
The specific file I'm using to exhibit the bug consists of many repeated
stanzas such as
=========================
{
{2.222222,2.222222,2.222222,2.2},
{-2.222222,2.222222,2.222222},
{-22.222222,22.222222,2.222222}
},
=========================
without the =. Saving a stanza into a file called 'snippet', the 14MB
file can be made with
$ for i in `seq 17`; do cat snippet snippet > xxx; mv xxx snippet; done
Thanks.
In GNU Emacs 24.1.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2)
of 2012-06-29 on zelenka, modified by Debian
(emacs-snapshot package, version 2:20120629-1)
Windowing system distributor `The X.Org Foundation', version 11.0.11201902
Configured using:
`configure '--build' 'x86_64-linux-gnu' '--host' 'x86_64-linux-gnu'
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
'--localstatedir=/var' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.1.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.1.50/site-lisp:/usr/share/emacs/site-lisp'
'--without-compress-info' '--with-crt-dir=/usr/lib/x86_64-linux-gnu/'
'--with-x=yes' '--with-x-toolkit=gtk3' '--with-imagemagick=yes'
'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu'
'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g
-Wl,--as-needed -znocombreloc' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''
Important settings:
value of $LC_ALL: C
value of $LANG: C
locale-coding-system: nil
default enable-multibyte-characters: t
Major mode: Fundamental
Minor modes in effect:
tooltip-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
Recent input:
y <down> <down> <down> <down> <down> <down> <up> M-x
b e n c h m a r k <return> ( p r e v i o u s - l i
n e ) <return> <help-echo> <help-echo> M-x r e p o
r t SPC b u g <return>
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
File snippet is large (13.1M), really open? (y or n) y
Elapsed time: 2.232054s
Load-path shadows:
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backquote make-network-process dbusbind dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#11943: 24.1.50; Emacs unusably slow when looking at large files (bidi support at fault) |
|
Date: |
Sun, 15 Jul 2012 17:47:18 +0300 |
> Date: Sat, 14 Jul 2012 20:31:03 -0700
> From: Dima Kogan <address@hidden>
> Cc: address@hidden
>
> > On Sun, 15 Jul 2012 06:04:47 +0300
> > Eli Zaretskii <address@hidden> wrote:
> >
> > > From: Dima Kogan <address@hidden>
> > > Date: Sat, 14 Jul 2012 17:50:51 -0700
> > >
> > > I'm observing that when some large text files are loaded, emacs
> > > slows to a crawl. As an example, I have a 14MB file open (with
> > > emacs -Q). Every time I do (next-line) or (previous-line) it takes
> > > a few seconds. This is a > 2GHz Core2 machine, so there's no reason
> > > for this to happen. 'M-x benchmark' says that (previous-line) takes
> > > >2s each time. I discovered that if I do (setq
> > > >bidi-display-reordering nil) then emacs is snappy
> > > again, with previous-line taking <1ms.
> > >
> > > The specific file I'm using to exhibit the bug consists of many
> > > repeated stanzas such as
> > >
> > > =========================
> > > {
> > > {2.222222,2.222222,2.222222,2.2},
> > > {-2.222222,2.222222,2.222222},
> > > {-22.222222,22.222222,2.222222}
> > > },
> > > =========================
> > >
> > > without the =. Saving a stanza into a file called 'snippet', the
> > > 14MB file can be made with
> > >
> > > $ for i in `seq 17`; do cat snippet snippet > xxx; mv xxx snippet;
> > > done
> >
> > What is the major mode in the buffer where you see this? I mean the
> > real-life example where you bumped into this, not the 'snippet' file
> > produced by the above.
>
> fundamental-mode
The recommended way to handle such buffers is to set
bidi-paragraph-direction to left-to-right. Major modes for editing
program source, that inherit from prog-mode, already do that
automatically, but fundamental-mode does not (and can not, IMO).
That's why I asked you about the major mode.
Anyway, to avoid such catastrophic slow-downs, I made a change in the
code that determines base paragraph direction, and committed those
changes as trunk revision 109098. With those changes, redisplay
should be again fast, even with bidi-paragraph-direction at its
default nil value.
Thanks.
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