From: Dave Chinner <david@fromorbit.com>
To: "Jörn Engel" <joern@logfs.org>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: Filesystem benchmarks on reasonably fast hardware
Date: Tue, 19 Jul 2011 20:15:53 +1000 [thread overview]
Message-ID: <20110719101553.GN30254@dastard> (raw)
In-Reply-To: <20110719073633.GN1437@logfs.org>
On Tue, Jul 19, 2011 at 09:36:33AM +0200, Jörn Engel wrote:
> On Tue, 19 July 2011 12:41:38 +1000, Dave Chinner wrote:
> > On Mon, Jul 18, 2011 at 01:40:36PM +0200, Jörn Engel wrote:
> > > On Mon, 18 July 2011 20:57:49 +1000, Dave Chinner wrote:
> > > > On Mon, Jul 18, 2011 at 09:53:39AM +0200, Jörn Engel wrote:
> > > > > On Mon, 18 July 2011 09:32:52 +1000, Dave Chinner wrote:
> > > > > > On Sun, Jul 17, 2011 at 06:05:01PM +0200, Jörn Engel wrote:
> > > >
> > > > > > > xfs:
> > > > > > > ====
> > > > > > > seqrd 1 2 4 8 16 32 64 128
> > > > > > > 16384 4698 4424 4397 4402 4394 4398 4642 4679
> > > > > > > 8192 6234 5827 5797 5801 5795 6114 5793 5812
> > > > > > > 4096 9100 8835 8882 8896 8874 8890 8910 8906
> > > > > > > 2048 14922 14391 14259 14248 14264 14264 14269 14273
> > > > > > > 1024 23853 22690 22329 22362 22338 22277 22240 22301
> > > > > > > 512 37353 33990 33292 33332 33306 33296 33224 33271
> >
> > > seqrd 1 2 4 8 16 32 64 128
> > > 16384 4542 8311 15738 28955 38273 36644 38530 38527
> > > 8192 6000 10413 19208 33878 65927 76906 77083 77102
> > > 4096 8931 14971 24794 44223 83512 144867 147581 150702
> > > 2048 14375 23489 34364 56887 103053 192662 307167 309222
> > > 1024 21647 36022 49649 77163 132886 243296 421389 497581
> > > 512 31832 61257 79545 108782 176341 303836 517814 584741
> >
> > > What bothers me a bit is that the single-threaded numbers took such a
> > > noticeable hit...
> >
> > Is it reproducable? I did notice quite a bit of run-to-run variation
> > in the numbers I ran. For single threaded numbers, they appear to be
> > in the order of +/-100 ops @ 16k block size.
>
> Ime the numbers are stable within about 10%. And given that out of
> six measurements every single one is a regression, I would feel
> confident to bet a beverage without further measurements. Regression
> is 3.4%, 3.9%, 1.9%, 3.8%, 10% and 17% respectively, so the effect
> appears to be more visible with smaller block numbers as well.
Only thing I can think of then is that taking the lock shared is
more expensive than taking it exclusive. Otherwise there is little
change to the code path....
/me shrugs and cares not all that much right now
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2011-07-19 10:16 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-17 16:05 Filesystem benchmarks on reasonably fast hardware Jörn Engel
2011-07-17 23:32 ` Dave Chinner
[not found] ` <20110718075339.GB1437@logfs.org>
2011-07-18 10:57 ` Dave Chinner
2011-07-18 11:40 ` Jörn Engel
2011-07-19 2:41 ` Dave Chinner
2011-07-19 7:36 ` Jörn Engel
2011-07-19 9:23 ` srimugunthan dhandapani
2011-07-21 19:05 ` Jörn Engel
2011-07-19 10:15 ` Dave Chinner [this message]
2011-07-18 14:34 ` Jörn Engel
[not found] ` <20110718103956.GE1437@logfs.org>
2011-07-18 11:10 ` Dave Chinner
2011-07-18 12:07 ` Ted Ts'o
2011-07-18 12:42 ` Jörn Engel
2011-07-25 15:18 ` Ted Ts'o
2011-07-25 18:20 ` Jörn Engel
2011-07-25 21:18 ` Ted Ts'o
2011-07-26 14:57 ` Ted Ts'o
2011-07-27 3:39 ` Yongqiang Yang
2011-07-19 13:19 ` Dave Chinner
2011-07-21 10:42 ` Jörn Engel
2011-07-22 18:51 ` Jörn Engel
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