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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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WARNING: multiple messages have this Message-ID (diff)
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?


  reply	other threads:[~2013-08-14 20:50 UTC|newest]

Thread overview: 67+ 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 17:10 ` Dave Hansen
2013-08-14 19:43 ` Theodore Ts'o
2013-08-14 19:43   ` Theodore Ts'o
2013-08-14 20:50   ` Dave Hansen [this message]
2013-08-14 20:50     ` Dave Hansen
2013-08-14 23:06     ` Theodore Ts'o
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  4:32               ` Andy Lutomirski
2013-08-15  6:01               ` Dave Chinner
2013-08-15  6:14                 ` Andy Lutomirski
2013-08-15  6:14                   ` Andy Lutomirski
2013-08-15  6:18                   ` David Lang
2013-08-15  6:18                     ` David Lang
2013-08-15  6:28                     ` Andy Lutomirski
2013-08-15  6:28                       ` Andy Lutomirski
2013-08-15  7:11                   ` Dave Chinner
2013-08-15  7:11                     ` Dave Chinner
2013-08-15  7:45                     ` Jan Kara
2013-08-15 21:28                       ` Dave Chinner
2013-08-15 21:28                         ` 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 23:23                           ` David Lang
2013-08-19 23:31                           ` Andy Lutomirski
2013-08-15 15:17                     ` Andy Lutomirski
2013-08-15 15:17                       ` Andy Lutomirski
2013-08-15 21:37                       ` Dave Chinner
2013-08-15 21:37                         ` Dave Chinner
2013-08-15 21:43                         ` Andy Lutomirski
2013-08-15 21:43                           ` Andy Lutomirski
2013-08-15 22:18                           ` Dave Chinner
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 22:02                           ` J. Bruce Fields
2013-08-16 23:18                           ` Andy Lutomirski
2013-08-16 23:18                             ` Andy Lutomirski
2013-08-18 20:17                             ` J. Bruce Fields
2013-08-18 20:17                               ` J. Bruce Fields
2013-08-19 22:17                 ` J. Bruce Fields
2013-08-19 22:17                   ` J. Bruce Fields
2013-08-19 22:29                   ` Andy Lutomirski
2013-08-19 22:29                     ` Andy Lutomirski
2013-08-15 15:14           ` Dave Hansen
2013-08-15 15:14             ` Dave Hansen
2013-08-15  0:24 ` Dave Chinner
2013-08-15  0:24   ` Dave Chinner
2013-08-15  2:24   ` Andi Kleen
2013-08-15  2:24     ` Andi Kleen
2013-08-15  4:29     ` Dave Chinner
2013-08-15  4:29       ` Dave Chinner
2013-08-15 15:36       ` Dave Hansen
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 17:45     ` Dave Hansen
2013-08-15 19:31     ` Theodore Ts'o
2013-08-15 19:31       ` Theodore Ts'o

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