GNU bug report logs - #55729
27.1; Emacs 28.1 `string-match' is five times slower than Emacs 27.1

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Package: emacs;

Reported by: Chen Bin <chenbin.sh <at> gmail.com>

Date: Mon, 30 May 2022 14:47:01 UTC

Severity: normal

Found in version 27.1

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Ihor Radchenko <yantar92 <at> gmail.com>
To: Chen Bin <chenbin.sh <at> gmail.com>
Cc: 55729 <at> debbugs.gnu.org
Subject: bug#55729: 27.1; Emacs 28.1 `string-match' is five times slower than Emacs 27.1
Date: Mon, 30 May 2022 23:01:07 +0800

Chen Bin <chenbin.sh <at> gmail.com> writes:

> Run below code in both Emacs 28.1 and Emacs 27.1
>
> ;; Run "base64 /dev/urandom | head -c 3000000000 > 3g.txt" to create 3g.txt
> ;; Then run below code in Emacs,
>
> Using same machine, same emacs setup, 28 is alwasy much slower than 27.

On my system:

Emacs-27          (0.032783519 0 0.0) vs (0.093436952 0 0.0)
Emacs-28 (latest) (0.037079772999999996 0 0.0) vs (0.162106006 0 0.0)
Emacs-29 (latest) (0.03358834 0 0.0) vs (0.15387368299999998 0 0.0)

Best,
Ihor
This bug report was last modified 3 years and 49 days ago.

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