From: Alex Elder <aelder@sgi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH] xfs_repair: multithread phase 2
Date: Tue, 01 Feb 2011 17:39:10 -0600 [thread overview]
Message-ID: <1296603550.2350.134.camel@doink> (raw)
In-Reply-To: <1294620248-17098-1-git-send-email-david@fromorbit.com>
On Mon, 2011-01-10 at 11:44 +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> Running some recent repair tests on broken filesystem meant running
> phase 1 and 2 repeatedly to reproduce an issue at the start of phase
> 3. Phase 2 was taking approximately 10 minutes to run as it
> processes each AG serially.
>
> Phase 2 can be trivially parallelised - it is simply scanning the
> per AG trees to calculate free block counts and free and used inodes
> counts. This can be done safely in parallel by giving each AG it's
> own structure to aggregate counts into, then once the AG scan is
> complete adding them all together.
>
> This patch uses 32-way threading which results in no noticable
> slowdown on single SATA drives with NCQ, but results in ~10x
> reduction in runtime on a 12 disk RAID-0 array.
>
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
This looks good. Sorry I didn't say so earlier (I signed
off on your first one).
Reviewed-by: Alex Elder <aelder@sgi.com>
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next prev parent reply other threads:[~2011-02-01 23:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-10 0:44 [PATCH] xfs_repair: multithread phase 2 Dave Chinner
2011-01-10 7:57 ` Michael Monnerie
2011-01-10 8:41 ` Dave Chinner
2011-01-10 13:25 ` Michael Monnerie
2011-01-10 19:18 ` Christoph Hellwig
2011-01-10 19:17 ` Christoph Hellwig
2011-01-10 21:53 ` Matthias Schniedermeyer
2011-01-10 18:55 ` Christoph Hellwig
2011-02-01 23:39 ` Alex Elder [this message]
-- strict thread matches above, loose matches on Subject: below --
2011-01-04 6:13 Dave Chinner
2011-01-04 10:02 ` Christoph Hellwig
2011-01-04 12:00 ` Dave Chinner
2011-01-05 23:42 ` Alex Elder
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