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bug#18558: 24.4.50; Debugger slow with long strings
From: |
Marcin Borkowski |
Subject: |
bug#18558: 24.4.50; Debugger slow with long strings |
Date: |
Fri, 19 Feb 2016 09:41:01 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) |
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.
Best,
--
mbork
- bug#18558: 24.4.50; Debugger slow with long strings,
Marcin Borkowski <=