From: Arjan van de Ven <arjan@infradead.org>
To: Jim Meyering <jim@meyering.net>
Cc: Theodore Tso <tytso@mit.edu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: efficient access to "rotational"; new fcntl?
Date: Sat, 19 Sep 2009 10:31:49 +0200 [thread overview]
Message-ID: <20090919103149.54258081@infradead.org> (raw)
In-Reply-To: <87pr9npdlc.fsf@meyering.net>
On Sat, 19 Sep 2009 10:01:51 +0200
Jim Meyering <jim@meyering.net> wrote:
> Yeah, I mentioned I should do exactly that on IRC yesterday.
> I've just run some tests, and see that at least with one SSD (OCZ
> Summit 120GB), the 0.5s cost of sorting pays off handsomely with a
> 12-x speed-up, saving 5.5 minutes, when removing a
> 1-million-empty-file directory.
>
likely because you actually reduce the amount of IO; inodes share
disk blocks; repeated unlinks in random order likely write the same
block multiple times....
btw have you given thought about using threads as part of rm -r[f] ?
(would make the unlinks of unrelated directories/files asynchronous)
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2009-09-19 8:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-18 19:31 efficient access to "rotational"; new fcntl? Jim Meyering
2009-09-18 22:16 ` Theodore Tso
2009-09-19 8:01 ` Jim Meyering
2009-09-19 8:31 ` Arjan van de Ven [this message]
2009-09-19 9:07 ` Jim Meyering
2009-09-19 9:19 ` Arjan van de Ven
2009-09-19 11:11 ` Avi Kivity
2009-09-19 11:30 ` Arjan van de Ven
2009-09-19 11:40 ` Avi Kivity
2009-09-19 11:25 ` Willy Tarreau
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