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From: Michael Heerdegen <michael_heerdegen@web.de>
To: Noam Postavsky <npostavs@gmail.com>
Cc: Gemini Lasswell <gazally@runbox.com>, 36566@debbugs.gnu.org
Subject: bug#36566: 27.0.50; debug is sometimes horribly slow
Date: Thu, 11 Jul 2019 00:46:00 +0200	[thread overview]
Message-ID: <87r26xjyon.fsf@web.de> (raw)
In-Reply-To: <871ryy2l1t.fsf@gmail.com> (Noam Postavsky's message of "Wed, 10 Jul 2019 07:20:14 -0400")

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Noam Postavsky <npostavs@gmail.com> writes:

> > sometimes it takes 10 or 20 seconds until the debugger pops up.  I
> > debugged code using widgets (who are complicated long lists).  But both
> > the number of frames and the length of the printed lists were not
> > exorbitant - a quite normal situation.
>
> Can you give an example recipe that produces the slowness?  It's not
> usually slow, right?  (When I trigger the debugger in master right now,
> I don't notice problem.)

I investigated a bit and found that the main factor of the sluggishness
seems to be my private (global) setting of print-gensym -> t: I can
toggle sluggishness in both the Emacs with my setup and emacs -Q just by
toggling this variable.  My debugger use case involves gensyms (see
later).  Ok, so it's probably mainly a printing issue.

Here is my use case: load the attached file (don't compile, I made it
contain a bug).  M-x find-cmd-widget, and insert a "links" expression
by hitting the INS button and select "links" with the "expr" button.

With print-gemsym -> nil, the debugger needs approx. 2 seconds here to
pop up, and with print-gemsym -> t, approx. 12.  So I wonder why this
setting makes it that slow - I would expect a small time penalty, but
such a big difference?

BTW, extra points if the debugger provided commands/ a menu to tune such
settings (like printing variables) live when using it.


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Thanks,

Michael.

  reply	other threads:[~2019-07-10 22:46 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-10  3:09 bug#36566: 27.0.50; debug is sometimes horribly slow Michael Heerdegen
2019-07-10  3:18 ` Drew Adams
2019-07-10 11:20 ` Noam Postavsky
2019-07-10 22:46   ` Michael Heerdegen [this message]
2019-07-14  0:02     ` Gemini Lasswell
2019-07-15  2:05       ` Michael Heerdegen
2019-08-01  1:06         ` Gemini Lasswell
2019-08-01  0:53       ` Gemini Lasswell
2019-08-01  1:05         ` Noam Postavsky
2019-08-05 19:53           ` Gemini Lasswell
2019-08-19  1:30             ` Noam Postavsky
2019-09-06 16:41               ` Gemini Lasswell
2019-09-11  2:54                 ` Noam Postavsky
2019-09-13 21:08                   ` Gemini Lasswell
2019-09-14 13:44                     ` Mauro Aranda
2019-09-14 14:05                       ` Eli Zaretskii
2019-09-14 14:16                         ` Mauro Aranda
2019-09-14 15:47                           ` Eli Zaretskii
2022-04-25 14:41                     ` Lars Ingebrigtsen
2022-04-25 23:23                       ` Michael Heerdegen
2022-04-27  0:37                       ` Gemini Lasswell
2022-04-27  4:42                         ` Michael Heerdegen
2022-04-27 12:28                           ` Lars Ingebrigtsen
2022-04-28 17:56                             ` Gemini Lasswell
2022-05-13 16:01                               ` Lars Ingebrigtsen
2022-05-14  3:57                                 ` Michael Heerdegen
2022-05-14 11:35                                   ` Lars Ingebrigtsen
2022-05-14 13:52                                     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-14 15:45                                       ` Lars Ingebrigtsen
2022-05-14 16:05                                         ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-14 16:18                                           ` Lars Ingebrigtsen
2022-05-14 16:54                                             ` Lars Ingebrigtsen
2022-05-14 18:55                                               ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-15 12:25                                                 ` Lars Ingebrigtsen
2022-05-15 13:33                                                   ` Lars Ingebrigtsen
2022-05-15 16:13                                                   ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-15 16:25                                                     ` Lars Ingebrigtsen
2022-05-15 16:52                                                       ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-16  1:00                                                         ` Lars Ingebrigtsen
2022-05-16  1:39                                                           ` Michael Heerdegen
2022-05-16  1:44                                                           ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-05-16 12:11                                                             ` Lars Ingebrigtsen
2022-05-15  7:47                                           ` Rudolf Schlatte
2022-05-15 12:28                                             ` Lars Ingebrigtsen

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