GNU bug report logs - #67502
[Cuirass] ‘cuirass remote-worker’ gets the CPU count wrong on the OverDrive

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Package: guix;

Reported by: Ludovic Courtès <ludovic.courtes <at> inria.fr>

Date: Tue, 28 Nov 2023 09:11:02 UTC

Severity: normal

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

Bug is archived. No further changes may be made.

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Message #10 received at 67502-done <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: 67502-done <at> debbugs.gnu.org
Subject: Re: bug#67502: [Cuirass] ‘cuirass remote-worker’ gets the CPU count wrong on the OverDrive
Date: Tue, 28 Nov 2023 16:28:50 +0100

Ludovic Courtès <ludovic.courtes <at> inria.fr> skribis:

> ludo <at> dover ~$ sudo herd status cuirass-remote-worker
> Status of cuirass-remote-worker:
>   It is started.
>   Running value is 21279.
>   It is enabled.
>   Provides (cuirass-remote-worker).
>   Requires (avahi-daemon guix-daemon networking).
>   Will be respawned.
> ludo <at> dover ~$ guile -c '(pk (getaffinity 21279))'
>
> ;;; (#*1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000)

This was due to ‘run-fibers’ binding one thread per CPU core.  Thus,
calling ‘getaffinity’ from within ‘run-fibers’ shows only one CPU and
likewise ‘current-processor-count’ returns 1.

Fixed in Cuirass commit 87a6d6ea7ae79fdf487bbcfd44bb3dce2d7c6e82.

Ludo’.
This bug report was last modified 1 year and 170 days ago.

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