From: Luke Lonergan <llonergan@greenplum.com>
To: Michael Stone <mstone+postgres@mathom.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Hardware/OS recommendations for large databases (
Date: Tue, 15 Nov 2005 10:47:59 -0800
Message-ID: <BF9F6D5F.13B4E%llonergan@greenplum.com> (raw)
In-Reply-To: <20051115145545.GQ9905@mathom.us>
Mike,
On 11/15/05 6:55 AM, "Michael Stone" <mstone+postgres@mathom.us> wrote:
> On Tue, Nov 15, 2005 at 09:33:25AM -0500, Luke Lonergan wrote:
>> >write performance is now up to par with the best cards I believe. We
>> >find that you still need to set Linux readahead to at least 8MB
>> >(blockdev --setra) to get maximum read performance on them, is that your
>
> What on earth does that do to your seek performance?
We¹re in decision support, as is our poster here, so seek isn¹t the issue,
it¹s sustained sequential transfer rate that we need. At 8MB, I¹d not
expect too much damage though the default is 1.5MB.
- Luke
>
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To: pgsql-performance@postgresql.org
Cc: llonergan@greenplum.com, mstone+postgres@mathom.us
Subject: Re: Hardware/OS recommendations for large databases (
In-Reply-To: <BF9F6D5F.13B4E%llonergan@greenplum.com>
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