From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pjotr Prins <pjotr.public12@thebird.nl>
Subject: Re: /gnu/store/.links/
Date: Fri, 9 Feb 2018 15:24:00 +0100
Message-ID: <20180209142400.GA6348@thebird.nl>
References: <20180209112214.GA5316@thebird.nl>
 <87d11e747o.fsf@elephly.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:55429)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pjotr2017@thebird.nl>) id 1ek9eQ-0000IS-JA
	for guix-devel@gnu.org; Fri, 09 Feb 2018 09:27:43 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <pjotr2017@thebird.nl>) id 1ek9eM-0000Fl-KR
	for guix-devel@gnu.org; Fri, 09 Feb 2018 09:27:42 -0500
Received: from mail.thebird.nl ([95.154.246.10]:53162)
	by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)
	(Exim 4.71) (envelope-from <pjotr2017@thebird.nl>)
	id 1ek9eM-0000FH-Eu
	for guix-devel@gnu.org; Fri, 09 Feb 2018 09:27:38 -0500
Content-Disposition: inline
In-Reply-To: <87d11e747o.fsf@elephly.net>
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel/>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: "Guix-devel" <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
To: Ricardo Wurmus <rekado@elephly.net>
Cc: Guix-devel <guix-devel@gnu.org>

On Fri, Feb 09, 2018 at 01:11:23PM +0100, Ricardo Wurmus wrote:
>=20
> Hi Pjotr,
>=20
> > What is
> >
> >   ls -1 /gnu/store/.links/|wc -l
> >   495938
> >
> > Never saw it before. Does this scale?
>=20
> It=E2=80=99s used for optional file deduplication.  It is enabled by de=
fault,
> but you can disable it with a daemon option on file systems that
> deduplicate data at the block level.

Hmmm. I think this is better handled at the file system level if
people want deduplication. These systems will be more common.

> 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.
Thanks for explaining.

Pj.