From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark H Weaver <mhw@netris.org>
Subject: Re: /gnu/store/.links/
Date: Fri, 09 Feb 2018 13:08:14 -0500
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In-Reply-To: <87372ayu7h.fsf@gnu.org> ("Ludovic
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>

ludo@gnu.org (Ludovic Court=C3=A8s) writes:

> Pjotr Prins <pjotr.public12@thebird.nl> skribis:
>
>> On Fri, Feb 09, 2018 at 01:11:23PM +0100, Ricardo Wurmus wrote:
>
> [...]
>
>>> I don=E2=80=99t know about scalability.  This number is still well belo=
w the
>>> limits of ext4 file systems, but accessing a big directory listing like
>>> that can be slow.  I would feel a little better about this if we split
>>> it up into different prefix directories (like it=E2=80=99s done for bro=
wser
>>> caches).  I don=E2=80=99t think it=E2=80=99s necessary, though.
>>
>> For ext4 it is going to be an issue. Anyway, we'll see what happens.
>
> In practice, when the maximum number of links is reached, we simply
> transparently skip deduplication.

Ideally, we should at some point change the daemon to break
/gnu/store/.links up into several subdirectories, as is done for log
files in /var/log/guix/drvs.  The main complication is dealing with the
transition between the old layout and the new.

       Mark