linux-kernel - Re: announce: fsopbench - filesystem operations benchmark

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Message-ID: <alpine.DEB.2.00.0909190736220.4635@sebohet.brgvxre.pu>
Date:	Sat, 19 Sep 2009 07:40:01 +0200 (CEST)
From:	Tobias Oetiker <tobi@...iker.ch>
To:	david@...g.hm
cc:	linux-kernel@...r.kernel.org
Subject: Re: announce: fsopbench - filesystem operations benchmark

Yesterday david@...g.hm wrote:

> On Fri, 18 Sep 2009, Tobi Oetiker wrote:
>
> > Hi David,
> >
> > Today david@...g.hm wrote:
> >
> > > On Fri, 18 Sep 2009, Tobias Oetiker wrote:
> > >
> > > >
> > > >   http://oss.oetiker.ch/optools/wiki/fsopbench
> > > >
> > > > It shows similar results on all configurations I have tested.
> > > > In the example below you see:
> > > >
> > > > * lstat: 10 times slower
> > > > * reading the first byte of a file: 80 times slower
> > > > * reading a directory entry: 16 times slower
> > > > * read rate: 40 times lower
> > >
> > > lower and slower than what?
> >
> > reading on an idle system vs reading on a system where writer
> > processees are active ...
>
> as a user I would expect that a disk that is busy being written to will be
> slower to read from.
>
> what would you expect to happen in this situation?

sure, the question is how much slower ... 40 times slower speed and
80 times slower response time is a bit much I would say ...

half the speed and half the response time would be what I would
expect ... but then thats just me ...

cheers
tobi
-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi@...iker.ch ++41 62 775 9902 / sb: -9900
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