From: Joost Kraaijeveld <J.Kraaijeveld@Askesis.nl>
To: Richard Huxton <dev@archonet.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: x206-x225
Date: Sat, 11 Mar 2006 08:49:38 +0100
Message-ID: <1142063378.6634.13.camel@localhost> (raw)
In-Reply-To: <441181C6.3040401@archonet.com>
References: <GMEAJIDMNDKCIHMMHDFLCEKHDHAA.hjs@rmax.nl>
<441181C6.3040401@archonet.com>
On Fri, 2006-03-10 at 13:40 +0000, Richard Huxton wrote:
> Your ATA disk is lying about disk caching being turned off. Assuming
> each insert is in a separate transaction, then it's not going to do
> 10,000 / 6 = 1667 transactions/sec - that's faster than it's rotational
> speed.
Could you explain the calculation? Why should the number of transactions
be related to the rotational speed of the disk, without saying anything
about the number of bytes per rotation?
--
Groeten,
Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: 024-3888063 / 06-51855277
fax: 024-3608416
e-mail: J.Kraaijeveld@Askesis.nl
web: www.askesis.nl
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To: pgsql-performance@postgresql.org
Cc: J.Kraaijeveld@Askesis.nl, dev@archonet.com
Subject: Re: x206-x225
In-Reply-To: <1142063378.6634.13.camel@localhost>
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