Re: Filesystem benchmarks on reasonably fast hardware

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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.

Jörn

-- 
Schrödinger's cat is <BLINK>not</BLINK> dead.
-- Illiad
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