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From: Stefan Monnier via "Bug reports for GNU Emacs,
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Subject: bug#36566: 27.0.50; debug is sometimes horribly slow
Date: Sun, 15 May 2022 21:44:47 -0400
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Cc: Michael Heerdegen <michael_heerdegen@web.de>,
 Gemini Lasswell <gazally@runbox.com>, 36566@debbugs.gnu.org,
 Noam Postavsky <npostavs@gmail.com>
To: Lars Ingebrigtsen <larsi@gnus.org>
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In-Reply-To: <87h75qguki.fsf@gnus.org> (Lars Ingebrigtsen's message of "Mon,
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Lars Ingebrigtsen [2022-05-16 03:00:45] wrote:
> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> Maybe it would.  I tend to think we should focus the C code on printing
>> data quickly and in a `read`able way (i.e. in sync with `lread.c`) and
>> benefit from the comfort of ELisp for the implementation of the
>> human-readable version of the printout where performance is not as
>> important because we will truncate long outputs anyway.
> Well, OK...  but why does edebug use cl-prin1 then when stepping through
> code?

Because what is printed is intended to be read by a human rather than by `read`.

> Stepping through code should be fast, and we don't really care
> that much about the prettiness of the values were displaying then.

I think we do care to see closures printed in a human-understandable
way, for example.

And with a `char-length` constraint the output should always be fast.


        Stefan