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bug#29463: 27.0.50; Backtraces with large strings is very slow
From: |
Lars Ingebrigtsen |
Subject: |
bug#29463: 27.0.50; Backtraces with large strings is very slow |
Date: |
Mon, 27 Nov 2017 03:53:28 +0100 |
I was trying to debug some code that dealt with very large SVG images,
and getting a backtrace buffer proved impossible -- Emacs would just
hang.
Here's a trivial test case:
(let ((a (make-string 100000000 ?a)))
(debug a))
On my machine, this takes about half a minute to display, but if you
have deeply nested code that the debugger is trying to display, you'll
get that additional time per frame, I think, so it can take arbitrarily
long to render the buffer.
It would be nice if the backtrace buffer would just chop off
ridiculously long strings instead of printing them. Perhaps controlled
by a -print-length variable?
In GNU Emacs 27.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
of 2017-10-26 built on stories
Repository revision: 1ad56d0a6bdd07c722a3c161096a16f70d1cbb35
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description: Debian GNU/Linux 9.2 (stretch)
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#29463: 27.0.50; Backtraces with large strings is very slow,
Lars Ingebrigtsen <=