GNU bug report logs - #72137
[PATCH 0/2] Avoid cache cleanup storms

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#72137: closed ([PATCH 0/2] Avoid cache cleanup storms)
Date: Tue, 20 Aug 2024 22:56:02 +0000

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Your message dated Wed, 21 Aug 2024 00:54:45 +0200
with message-id <87seuyst3e.fsf <at> gnu.org>
and subject line Re: [bug#72137] [PATCH 0/2] Avoid cache cleanup storms
has caused the debbugs.gnu.org bug report #72137,
regarding [PATCH 0/2] Avoid cache cleanup storms
to be marked as done.

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72137: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=72137
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From: Ludovic Courtès <ludo <at> gnu.org>
To: guix-patches <at> gnu.org
Cc: Ludovic Courtès <ludo <at> gnu.org>
Subject: [PATCH 0/2] Avoid cache cleanup storms
Date: Tue, 16 Jul 2024 11:10:56 +0200

Hello!

This fixes “cache cleanup storms” reported by Chris Baines whereby
typically multiple ‘guix substitute’ processes would start cleaning
up /var/guix/substitute/cache concurrently, leading to poor performance
(in particular on build farms with many such processes running in
parallel, even worse when on spinning disks).

Thoughts?

Ludo’.

Ludovic Courtès (2):
  syscalls: Add ‘mode’ parameter to ‘lock-file’.
  cache: Avoid cache cleanup storms from concurrent processes.

 guix/build/syscalls.scm | 14 +++++++++-----
 guix/cache.scm          | 27 ++++++++++++++++++---------
 tests/cache.scm         | 30 +++++++++++++++++++++++++++++-
 tests/syscalls.scm      | 13 +++++++++++++
 4 files changed, 69 insertions(+), 15 deletions(-)


base-commit: eb508e32d2d359c94d2cabebfe90dc32ca5dcf4f
-- 
2.45.2

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From: Ludovic Courtès <ludo <at> gnu.org>
To: 72137-done <at> debbugs.gnu.org
Cc: Tobias Geerinckx-Rice <me <at> tobias.gr>, Christopher Baines <guix <at> cbaines.net>,
 Josselin Poiret <dev <at> jpoiret.xyz>, Simon Tournier <zimon.toutoune <at> gmail.com>,
 Mathieu Othacehe <othacehe <at> gnu.org>
Subject: Re: [bug#72137] [PATCH 0/2] Avoid cache cleanup storms
Date: Wed, 21 Aug 2024 00:54:45 +0200

Hi,

Ludovic Courtès <ludo <at> gnu.org> skribis:

> This fixes “cache cleanup storms” reported by Chris Baines whereby
> typically multiple ‘guix substitute’ processes would start cleaning
> up /var/guix/substitute/cache concurrently, leading to poor performance
> (in particular on build farms with many such processes running in
> parallel, even worse when on spinning disks).
>
> Thoughts?
>
> Ludo’.
>
> Ludovic Courtès (2):
>   syscalls: Add ‘mode’ parameter to ‘lock-file’.
>   cache: Avoid cache cleanup storms from concurrent processes.

I went ahead and pushed it as d921c742b774a9f0a016f3db6442d5c58a330c92.

Ludo’.

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