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Re: Avoiding the garbage collector for the Guix Data Service

From: Ludovic Courtès
Subject: Re: Avoiding the garbage collector for the Guix Data Service
Date: Wed, 12 Feb 2020 15:05:16 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Hi Christopher,

Christopher Baines <address@hidden> skribis:

> The Guix Data Service has Guix compute lots of derivations, and then it
> loads the data in to a database. I'm having some issues with the garbage
> collector though, as sometimes it removes data from the disk before I've
> had a chance to read it (at least I think this is what's happening, I
> think this job failed for this reason [1]).
> 1:
> I'm not quite sure what the best strategy is to combat this? I had a
> look, and I couldn't see how to acquire a lock to prevent the garbage
> collector from running. I thought about registering thousands of gc
> roots, but that seems to just move the race a bit, as there's still a
> period between generating the derivation and registering the root where
> it can be deleted.
> Any ideas?

At the Guix Days we discussed using ‘add-temp-root’ and similar to
ensure that .drv files are at least GC-protected for the duration of the
session (connection to the daemon).

Does that address your problem?


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