From: Mark Kirkwood <markir@paradise.net.nz>
To: Luke Lonergan <llonergan@greenplum.com>
Cc: Dave Cramer <pg@fastcrypt.com>
Cc: Greg Stark <gsstark@mit.edu>
Cc: Joshua Marsh <icub3d@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Hardware/OS recommendations for large databases (
Date: Sat, 19 Nov 2005 15:27:49 +1300
Message-ID: <437E8DA5.1050703@paradise.net.nz> (raw)
In-Reply-To: <BFA3AC67.14125%llonergan@greenplum.com>
References: <BFA3AC67.14125%llonergan@greenplum.com>
Luke Lonergan wrote:
> Mark,
>
> On 11/18/05 3:46 PM, "Mark Kirkwood" <markir@paradise.net.nz> wrote:
>
> If you alter this to involve more complex joins (e.g 4. way star) and
> (maybe add a small number of concurrent executors too) - is it still the
> case?
>
>
> I may not have listened to you - are you asking about whether the
> readahead works for these cases?
>
> I’ll be running some massive TPC-H benchmarks on these machines soon –
> we’ll see then.
That too, meaning the business of 1 executor random reading a given
relation file whilst another is sequentially scanning (some other) part
of it....
Cheers
Mark
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Cc: markir@paradise.net.nz, llonergan@greenplum.com, pg@fastcrypt.com, gsstark@mit.edu, icub3d@gmail.com
Subject: Re: Hardware/OS recommendations for large databases (
In-Reply-To: <437E8DA5.1050703@paradise.net.nz>
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