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bug#55729: 27.1; Emacs 28.1 `string-match' is five times slower than Ema
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From: |
Eli Zaretskii |
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Subject: |
bug#55729: 27.1; Emacs 28.1 `string-match' is five times slower than Emacs 27.1 |
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Date: |
Mon, 30 May 2022 18:58:17 +0300 |
> Resent-From: Lars Ingebrigtsen <larsi@gnus.org>
> Original-Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
> Resent-CC: bug-gnu-emacs@gnu.org
> Resent-Sender: help-debbugs@gnu.org
> Cc: 55729@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Mon, 30 May 2022 17:09:58 +0200
>
> Chen Bin <chenbin.sh@gmail.com> writes:
>
> > Using same machine, same emacs setup, 28 is alwasy much slower than 27.
>
> How much slower?
>
> I tried your test, and the results were within a few percentages of each
> other in 27.1 and 28.1.
With a 3GB file being inserted non-literally, there could be factors
at work here that are entirely unrelated to processing speed. The
implementation of string-match basically didn't change between Emacs
27 and Emacs 28, AFAICT.