From: Mark Wong <markwkm@gmail.com>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Cc: Gabrielle Roth <gorthx@gmail.com>
Cc: Selena Deckelmann <selenamarie@gmail.com>
Subject: Re: dbt-2 tuning results with postgresql-8.3.5
Date: Mon, 22 Dec 2008 19:48:57 -0800
Message-ID: <70c01d1d0812221948y41e8e14do78c3f1f4e29acf0@mail.gmail.com> (raw)
In-Reply-To: <494F5D81.EE98.0025.0@wicourts.gov>
References: <70c01d1d0812201654i5f55150ep619a6c7ff094470@mail.gmail.com>
<494F5D81.EE98.0025.0@wicourts.gov>
On Mon, Dec 22, 2008 at 7:27 AM, Kevin Grittner
<Kevin.Grittner@wicourts.gov> wrote:
>>>> "Mark Wong" <markwkm@gmail.com> wrote:
>
>> The DL380 G5 is an 8 core Xeon E5405 with 32GB of
>> memory. The MSA70 is a 25-disk 15,000 RPM SAS array, currently
>> configured as a 25-disk RAID-0 array.
>
>> number of connections (250):
>
>> Moving forward, what other parameters (or combinations of) do people
>> feel would be valuable to illustrate with this workload?
>
> To configure PostgreSQL for OLTP on that hardware, I would strongly
> recommend the use of a connection pool which queues requests above
> some limit on concurrent queries. My guess is that you'll see best
> results with a limit somewhere aound 40, based on my tests indicating
> that performance drops off above (cpucount * 2) + spindlecount.
Yeah, we are using a homegrown connection concentrator as part of the
test kit, but it's not very intelligent.
> I wouldn't consider tests of the other parameters as being very useful
> before tuning this. This is more or less equivalent to the "engines"
> configuration in Sybase, for example.
Right, I have the database configured for 250 connections but I'm
using 200 of them. I'm pretty sure for this scale factor 200 is more
than enough. Nevertheless I should go through the exercise.
Regards,
Mark
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To: pgsql-performance@postgresql.org
Cc: markwkm@gmail.com, Kevin.Grittner@wicourts.gov, gorthx@gmail.com, selenamarie@gmail.com
Subject: Re: dbt-2 tuning results with postgresql-8.3.5
In-Reply-To: <70c01d1d0812221948y41e8e14do78c3f1f4e29acf0@mail.gmail.com>
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