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Re: Tuning for mid-size server

From: Richard Huxton <dev(at)archonet(dot)com>
To: "Anjan Dave" <adave(at)vantage(dot)com>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: Tuning for mid-size server
Date: 2003-10-21 15:56:50
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Lists: pgsql-performance
On Tuesday 21 October 2003 15:28, Anjan Dave wrote:
> Hi,
> Pretty soon, a PowerEdge 6650 with 4 x 2Ghz XEONs, and 8GB Memory, with
> internal drives on RAID5 will be delivered. Postgres will be from RH8.0.

You'll want to upgrade PG to v7.3.4

> I am planning for these values for the postgres configuration - to begin
> with:
> Shared_buffers (25% of RAM / 8KB)) = 8589934592 * .25 / 8192 = 262144
> Sort_mem (4% of RAM / 1KB) = 335544. We'll take about half of that -
> 167772
> Effective_cache_size = 262144 (same as shared_buffers - 25%)

My instincts would be to lower the first two substantially, and increase the 
effective cache once you know load levels. I'd probably start with something 
like the values below and work up:
shared_buffers = 8,000 - 10,000 (PG is happier letting the OS do the cacheing)
sort_mem = 4,000 - 8,000 (don't forget this is for each sort)

You'll find the annotated postgresql.conf and performance tuning articles 

> In a generic sense, these are recommended values I found in some
> documents. The database will be small in size and will gradually grow
> over time from few thousands to a few million records, or more. The
> activity will be mostly of select statements from a few tables with
> joins, orderby, groupby clauses. The web application is based on
> Apache/Resin and hotspot JVM 1.4.0.

You'll need to figure out how many concurrent users you'll have and how much 
memory will be required by apache/java. If your database grows radically, 
you'll probably want to re-tune as it grows.

  Richard Huxton
  Archonet Ltd

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