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From: Joost Kraaijeveld <J.Kraaijeveld@Askesis.nl>
To: Steve Wampler <swampler@noao.edu>
Cc: Luke Lonergan <llonergan@greenplum.com>
Cc: Dave Cramer <pg@fastcrypt.com>
Cc: Pgsql-Performance <pgsql-performance@postgresql.org>
Subject: Re: Performance PG 8.0 on dual opteron / 4GB / 3ware
Date: Tue, 15 Nov 2005 20:51:27 +0100
Message-ID: <1132084287.3250.41.camel@Panoramix> (raw)
In-Reply-To: <437A39E3.6030707@noao.edu>
References: <BF9F6C0E.13B4A%llonergan@greenplum.com>
	<1132083116.3250.38.camel@Panoramix>
	<437A39E3.6030707@noao.edu>

On Tue, 2005-11-15 at 12:41 -0700, Steve Wampler wrote:
> Joost Kraaijeveld wrote:
> > If I understand correctly (I have 4GB ram):
> > 
> > jkr@Panoramix:~/tmp$ dd if=/dev/zero of=bigfile bs=8k count=1000000
> > 1000000+0 records in
> > 1000000+0 records out
> > 8192000000 bytes transferred in 304.085269 seconds (26939812 bytes/sec)
> > 
> > Which looks suspicious: 26308 MB/sec???
> 
> Eh?  That looks more like ~25.7 MB/sec, assuming 1MB = 1024*1024 bytes.
Oooops. This calculation error is not typical for my testing (I think ;-)).

-- 
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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