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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 19:03:28 +0300 |
> Cc: chenbin.sh@gmail.com, 55729@debbugs.gnu.org
> Date: Mon, 30 May 2022 18:58:17 +0300
> From: Eli Zaretskii <eliz@gnu.org>
>
> > 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.
Here's one random thought: were both Emacs 27 and Emacs 28 compiled
with the same compiler version, and do they both use the same version
of the Standard C Library?