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bug#24937: "deleting unused links" GC phase is too slow
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From: |
Ludovic Courtès |
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Subject: |
bug#24937: "deleting unused links" GC phase is too slow |
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Date: |
Sun, 13 Nov 2016 18:41:01 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) |
‘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’.
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