GNU bug report logs - #57079
29.0.50; Performance of seq-uniq is not very good

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Package: emacs;

Reported by: Stefan Kangas <stefan <at> marxist.se>

Date: Tue, 9 Aug 2022 16:12:02 UTC

Severity: minor

Found in version 29.0.50

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Message #25 received at 57079 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 57079 <at> debbugs.gnu.org, stefan <at> marxist.se
Subject: Re: bug#57079: 29.0.50; Performance of seq-uniq is not very good
Date: Tue, 09 Aug 2022 19:23:10 +0200

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

>> delete-dups is destructive.  You can copy the list first, of course, but
>> seq-uniq should be much faster than it is.
>
> How much faster?  Using copy-sequence and delete-dups is 7 times
> faster here than seq-uniq and twice faster than
> gnus-delete-duplicates.

I didn't claim that seq-uniq will be faster than copy + delete-dups; I
just said that it's unnecessarily slow.
This bug report was last modified 3 years and 2 days ago.

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