From: Eli Zaretskii <eliz@gnu.org>
To: Karl Fogel <kfogel@red-bean.com>
Cc: dmantipov@yandex.ru, yates@digitalsignallabs.com, emacs-devel@gnu.org
Subject: Re: emacs takes exhorbitantly long to read long, one-line files.
Date: Mon, 20 May 2013 18:59:44 +0300 [thread overview]
Message-ID: <838v39wsjz.fsf@gnu.org> (raw)
In-Reply-To: <87r4h1lo20.fsf@kwarm.red-bean.com>
> From: Karl Fogel <kfogel@red-bean.com>
> Date: Mon, 20 May 2013 09:32:23 -0500
> Cc: Dmitry Antipov <dmantipov@yandex.ru>
>
> Dmitry Antipov <dmantipov@yandex.ru> writes:
> >> I already had that in my init.el. I've also tried creating an empty
> >> file and setting it to fundamental-mode. In both these cases the
> >> behavior is the same.
> >
> >Hm...is it the same with emacs -Q?
> >
> >> I did notice that emacs is faster - but still unusably slow - when
> >> toggle-truncate-lines is true.
> >
> >Try (setq-default cache-long-line-scans t) too.
>
> That should help a lot.
But it won't succeed to make Emacs usable with such files. E.g., try
this:
M->
C-p
and count the seconds it takes to perform the second command.
What Emacs does behind the scenes is go to the beginning of the
previous _physical_ line (which is quite fast in this case), and the
go all the way down the humongously long line, one character at a
time, until it finds the place to put the cursor. Unless we make
radical changes in this algorithm, how can anyone expect reasonable
performance from this?
next prev parent reply other threads:[~2013-05-20 15:59 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-19 3:52 emacs takes exhorbitantly long to read long, one-line files Randy Yates
2013-05-19 14:41 ` Eli Zaretskii
2013-05-20 8:40 ` Dmitry Antipov
2013-05-20 11:03 ` Randy Yates
2013-05-20 11:27 ` Dmitry Antipov
2013-05-20 14:32 ` Karl Fogel
2013-05-20 15:59 ` Eli Zaretskii [this message]
2013-05-20 16:25 ` Dmitry Antipov
2013-05-20 16:41 ` Eli Zaretskii
2013-05-20 21:43 ` Randy Yates
2013-05-21 2:21 ` Stephen J. Turnbull
2013-05-21 2:47 ` Eli Zaretskii
2013-05-21 7:57 ` Ulrich Mueller
2013-05-21 10:20 ` Dmitry Antipov
2013-05-21 12:06 ` Ulrich Mueller
2013-05-21 17:21 ` Eli Zaretskii
2013-05-21 17:18 ` Eli Zaretskii
2013-05-21 17:55 ` Eli Zaretskii
2013-05-21 18:03 ` Randy Yates
2013-05-21 18:28 ` Dmitry Antipov
2013-05-22 5:10 ` Ulrich Mueller
2013-05-22 14:51 ` Eli Zaretskii
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=838v39wsjz.fsf@gnu.org \
--to=eliz@gnu.org \
--cc=dmantipov@yandex.ru \
--cc=emacs-devel@gnu.org \
--cc=kfogel@red-bean.com \
--cc=yates@digitalsignallabs.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.