GNU bug report logs - #24937
"deleting unused links" GC phase is too slow

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Message #73 received at 24937 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: 24937 <at> debbugs.gnu.org
Subject: Re: bug#24937: "deleting unused links" GC phase is too slow
Date: Sat, 13 Nov 2021 22:45:15 +0100

[Message part 1 (text/plain, inline)]

Ludovic Courtès <ludo <at> 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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