From: Dave Hansen <dave.hansen@intel.com>
To: Theodore Ts'o <tytso@mit.edu>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com,
linux-ext4@vger.kernel.org, Jan Kara <jack@suse.cz>,
LKML <linux-kernel@vger.kernel.org>,
david@fromorbit.com, Tim Chen <tim.c.chen@linux.intel.com>,
Andi Kleen <ak@linux.intel.com>,
Andy Lutomirski <luto@amacapital.net>
Subject: Re: page fault scalability (ext3, ext4, xfs)
Date: Wed, 14 Aug 2013 13:50:02 -0700 [thread overview]
Message-ID: <520BED7A.4000903@intel.com> (raw)
In-Reply-To: <20130814194359.GA22316@thunk.org>
On 08/14/2013 12:43 PM, Theodore Ts'o wrote:
> Thanks dave for doing this comparison. Is there any chance you can
> check whether lockstats shows anything interesting?
>
>> Test case is this:
>>
>> https://github.com/antonblanchard/will-it-scale/blob/master/tests/page_fault3.c
>
> One interesting thing about the test case. It looks like the first
> time through the while loop, the file will need to be extended (since
> it is a new tempfile). But subsequent times through the list the
> blocks for the file will already be allocated. If the file is
> prezero'ed ahead of time, so we're only measuring the cost of the
> write page fault, and we take block allocation out of the comparison,
> do we see the same scalability curve?
Would a plain old fallocate() do the trick, or does it actually need
zeros written to it?
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next prev parent reply other threads:[~2013-08-14 20:50 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-14 17:10 page fault scalability (ext3, ext4, xfs) Dave Hansen
2013-08-14 19:43 ` Theodore Ts'o
2013-08-14 20:50 ` Dave Hansen [this message]
2013-08-14 23:06 ` Theodore Ts'o
2013-08-14 23:38 ` Andy Lutomirski
2013-08-15 1:11 ` Theodore Ts'o
2013-08-15 2:10 ` Dave Chinner
2013-08-15 4:32 ` Andy Lutomirski
2013-08-15 6:01 ` Dave Chinner
2013-08-15 6:14 ` Andy Lutomirski
2013-08-15 6:18 ` David Lang
2013-08-15 6:28 ` Andy Lutomirski
2013-08-15 7:11 ` Dave Chinner
2013-08-15 7:45 ` Jan Kara
2013-08-15 21:28 ` Dave Chinner
2013-08-15 21:31 ` Andy Lutomirski
2013-08-15 21:39 ` Dave Chinner
2013-08-19 23:23 ` David Lang
2013-08-19 23:31 ` Andy Lutomirski
2013-08-15 15:17 ` Andy Lutomirski
2013-08-15 21:37 ` Dave Chinner
2013-08-15 21:43 ` Andy Lutomirski
2013-08-15 22:18 ` Dave Chinner
2013-08-15 22:26 ` Andy Lutomirski
2013-08-16 0:14 ` Dave Chinner
2013-08-16 0:21 ` Andy Lutomirski
2013-08-16 22:02 ` J. Bruce Fields
2013-08-16 23:18 ` Andy Lutomirski
2013-08-18 20:17 ` J. Bruce Fields
2013-08-19 22:17 ` J. Bruce Fields
2013-08-19 22:29 ` Andy Lutomirski
2013-08-15 15:14 ` Dave Hansen
2013-08-15 0:24 ` Dave Chinner
2013-08-15 2:24 ` Andi Kleen
2013-08-15 4:29 ` Dave Chinner
2013-08-15 15:36 ` Dave Hansen
2013-08-15 15:09 ` Dave Hansen
2013-08-15 15:05 ` Theodore Ts'o
2013-08-15 17:45 ` Dave Hansen
2013-08-15 19:31 ` Theodore Ts'o
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