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bug#18558: 24.4.50; Debugger slow with long strings
From: |
Eli Zaretskii |
Subject: |
bug#18558: 24.4.50; Debugger slow with long strings |
Date: |
Fri, 19 Feb 2016 11:03:41 +0200 |
> From: Marcin Borkowski <mbork@mbork.pl>
> Date: Fri, 19 Feb 2016 09:41:01 +0100
> Cc: 18558@debbugs.gnu.org
>
> On 2014-09-25, at 12:16, Helmut Eller <eller.helmut@gmail.com> wrote:
>
> > Moving the cursor in the debugger window is very slow in the following
> > example:
> >
> > shell> cat test.el
> > (progn
> > (defun foo (n string)
> > (cond ((= n 0) (debug))
> > (t (foo (1- n) string))))
> > (foo 30 (make-string 500000 ?\\)))
> >
> > shell> emacs -Q -nw -l test.el
> >
> > Now move the cursor around to see the slowness.
> >
> > Maybe the debugger should truncate long strings as it does with long
> > lists.
>
> Confirmed on GNU Emacs 25.1.50.2 (commit 4ccd268).
>
> I would guess that the problem is not in long string /per se/, but with
> lon lines in the *Backtrace* buffer, i.e. probably something connected
> with the display engine. I guess this bug should either be closed or
> merged with some other one (one of the other ones, perhaps) dealing with
> efficiency problems with long lines.
Yes, please merge it.
Thanks.