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bug#58687: 29.0.50; Enabling pp-use-max-width dramatically slows down fo
From: |
Eli Zaretskii |
Subject: |
bug#58687: 29.0.50; Enabling pp-use-max-width dramatically slows down formatting of large sexps like org-persist--index |
Date: |
Thu, 12 Jan 2023 18:39:35 +0200 |
> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: m.eliachevitch@posteo.de, 58687@debbugs.gnu.org
> Date: Thu, 12 Jan 2023 16:19:37 +0000
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > 40041 85% - pp
> > 40041 85% - pp-to-string
> > 40041 85% - pp-emacs-lisp-code
> > 40028 85% - pp--insert-lisp
> > 40028 85% - pp--format-list
> > 40028 85% - pp--insert
> > 38710 82% - pp--insert-lisp
> > 38710 82% - pp--format-list
>
> So, the current `pp' implementation is re-parsing from bob for every
> nested list inside sexp.
Not "the current 'pp'", but the implementation for this optional
behavior.
> This is quadratic scaling, and, as the repro demonstrates, the time
> goes up very quickly. Is the new option usable at all in practice?
Maybe only for small code fragments.