From: Kevin Grittner <Kevin.Grittner@wicourts.gov>
To: Mark Wong <markwkm@gmail.com>
To: 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 09:27:29 -0600
Message-ID: <494F5D81.EE98.0025.0@wicourts.gov> (raw)
In-Reply-To: <70c01d1d0812201654i5f55150ep619a6c7ff094470@mail.gmail.com>
References: <70c01d1d0812201654i5f55150ep619a6c7ff094470@mail.gmail.com>
>>> "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.
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.
-Kevin
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To: pgsql-performance@postgresql.org
Cc: Kevin.Grittner@wicourts.gov, markwkm@gmail.com, gorthx@gmail.com, selenamarie@gmail.com
Subject: Re: dbt-2 tuning results with postgresql-8.3.5
In-Reply-To: <494F5D81.EE98.0025.0@wicourts.gov>
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