#24937 - "deleting unused links" GC phase is too slow

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

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From: Ludovic Courtès <ludo@gnu.org>
To: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Subject: Re: bug#24937: "deleting unused links" GC phase is too slow
References: <87wpg7ffbm.fsf@gnu.org> <87pmr9l76m.fsf@gnu.org>
 <87v90ys911.fsf@gmail.com> <87v90wat9n.fsf@gnu.org>
Date: Sat, 13 Nov 2021 22:45:15 +0100
In-Reply-To: <87v90wat9n.fsf@gnu.org> ("Ludovic Courtès"'s message of "Sat, 13 Nov 2021 17:56:52 +0100")
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[Message part 1 (text/plain, inline)]

Ludovic Courtès <ludo@gnu.org> skribis:

> In a nutshell:
>
>   • Files < 1KiB contribute to 0.3% of the space savings;
>
>   • Files < 4KiB contribute to 2.5% of the space savings;

I get similar results on bayfront.guix.gnu.org (with 3.2M entries):

[bayfront-space-saving-contribution.png (image/png, inline)]

[bayfront-size.png (image/png, inline)]

[Message part 4 (text/plain, inline)]

… and on guix.bordeaux.inria.fr (2.0M entries):

[guix-hpc4-space-saving-contribution.png (image/png, inline)]

[guix-hpc4-size.png (image/png, inline)]

[Message part 7 (text/plain, inline)]

Files < 4KiB represent between 60% and 75% of the /gnu/store/.links
entries here.

I’ve sent patches that implement a cutoff threshold at 4 KiB.

Thanks,
Ludo’.

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#24937 "deleting unused links" GC phase is too slow