unofficial mirror of bug-guix@gnu.org 
 help / color / mirror / code / Atom feed
From: ludo@gnu.org (Ludovic Courtès)
To: 24937@debbugs.gnu.org
Subject: bug#24937: "deleting unused links" GC phase is too slow
Date: Sun, 13 Nov 2016 18:41:01 +0100	[thread overview]
Message-ID: <87wpg7ffbm.fsf@gnu.org> (raw)

‘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’.

             reply	other threads:[~2016-11-13 17:42 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-13 17:41 Ludovic Courtès [this message]
2016-12-09 22:43 ` bug#24937: "deleting unused links" GC phase is too slow Ludovic Courtès
2016-12-11 13:46 ` Ludovic Courtès
2016-12-11 14:23   ` Mark H Weaver
2016-12-11 18:02     ` Ludovic Courtès
2016-12-11 19:27       ` Mark H Weaver
2016-12-13  0:00         ` Ludovic Courtès
2016-12-13 12:48           ` Mark H Weaver
2016-12-13 17:02             ` Ludovic Courtès
2016-12-13 17:18               ` Ricardo Wurmus
2020-04-16 13:26                 ` Ricardo Wurmus
2020-04-16 14:27                   ` Ricardo Wurmus
2020-04-17  8:16                     ` Ludovic Courtès
2020-04-17  8:28                       ` Ricardo Wurmus
2016-12-13  4:09         ` Mark H Weaver
2016-12-15  1:19           ` Mark H Weaver
2021-11-09 14:44 ` Ludovic Courtès
2021-11-09 15:00   ` Ludovic Courtès
2021-11-11 20:59   ` Maxim Cournoyer
2021-11-13 16:56     ` Ludovic Courtès
2021-11-13 21:37       ` bug#24937: [PATCH 1/2] tests: Factorize 'file=?' Ludovic Courtès
2021-11-13 21:37         ` bug#24937: [PATCH 2/2] daemon: Do not deduplicate files smaller than 4 KiB Ludovic Courtès
2021-11-16 13:54           ` bug#24937: "deleting unused links" GC phase is too slow Ludovic Courtès
2021-11-13 21:45       ` Ludovic Courtès
2021-11-22  2:30 ` John Kehayias via Bug reports for GNU Guix

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://guix.gnu.org/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87wpg7ffbm.fsf@gnu.org \
    --to=ludo@gnu.org \
    --cc=24937@debbugs.gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/guix.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).