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On Fri, Aug 25, 2006 at 11:55:45AM +0200, Michal Suchanek wrote:
> On 8/24/06, Quentin Garnier <cube@cubidou.net> wrote:
[...]
> >Directory operations are another story:
> >
> >                    ------Sequential Create------ --------Random=20
> >                    Create--------
> >                    -Create-- --Read--- -Delete-- -Create-- --Read---=20
> >                    -Delete--
> >Machine       files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP =
=20
> >/sec %CP
> >A               100 10195  26 92042  96 28823  54 14703  39 79685  96=20
> >29397  53
> >
> >Machine       files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP =
=20
> >/sec %CP
> >B               100   590  74 +++++ +++  2145  55   596  74  1013  99 =
=20
> >1088  69
> >
> >Only the sequential stats match the performance of machine A.  It shows
> >up as +++++ here but I got a number a couple of times and it was the
> >same order as machine A.
> >
> >But how do I explain the rest?  I mean, "random read".  That's almost 80
> >times slower!
> >
> >Partitions info:
> >A -> g: 122880240  24289776     4.2BSD   2048 16384   328
> >B -> e:  31461696  33559800     4.2BSD   2048 16384 28104
> >
> >What's the exact meaning of the last field?  Is it relevant to the
> >issue?  I simply newfs'd the partition.  The partition on machine A was
> >newfs'd a long, long time ago.
> >
>=20
> Note that incerasing the file size 8 times increases the seek times
> dramatically which _should_ result in poor random read/write
> performance.

Hmm?  I don't understand your comment;  I ran the directory tests with
-s 0, thus skipping the IO throughput test.

--=20
Quentin Garnier - cube@cubidou.net - cube@NetBSD.org
"When I find the controls, I'll go where I like, I'll know where I want
to be, but maybe for now I'll stay right here on a silent sea."
KT Tunstall, Silent Sea, Eye to the Telescope, 2004.

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