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

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Package: guix;

Reported by: ludo <at> gnu.org (Ludovic Courtès)

Date: Sun, 13 Nov 2016 17:42:02 UTC

Severity: important

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: ludo <at> gnu.org (Ludovic Courtès)
To: bug-guix <at> gnu.org
Subject: "deleting unused links" GC phase is too slow
Date: Sun, 13 Nov 2016 18:41:01 +0100

‘LocalStore::removeUnusedLinks’ traverses all the entries in
/gnu/store/.links and calls lstat(2) on each one of them and checks
‘st_nlink’ to determine whether they can be deleted.

There are two problems: lstat(2) can be slow on spinning disks as found
on hydra.gnu.org, and the algorithm is proportional in the number of
entries in /gnu/store/.links, which is a lot on hydra.gnu.org.

Ludo’.
This bug report was last modified 3 years and 203 days ago.

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