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Re: Peformance Tuning Opterons/ Hard Disk Layout

From: "Bruno Almeida do Lago" <teolupus(at)gmail(dot)com>
To: "'Michael Adler'" <adler(at)pobox(dot)com>
Cc: <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Peformance Tuning Opterons/ Hard Disk Layout
Date: 2005-02-23 18:26:18
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
Is there a real limit for max_connections? Here we've an Oracle server with
up to 1200 simultaneous conections over it!

"max_connections: exactly like previous versions, this needs to be set to
the actual number of simultaneous connections you expect to need. High
settings will require more shared memory (shared_buffers). As the
per-connection overhead, both from PostgreSQL and the host OS, can be quite
high, it's important to use connection pooling if you need to service a
large number of users. For example, 150 active connections on a medium-end
32-bit Linux server will consume significant system resources, and 600 is
about the limit."

C ya,


-----Original Message-----
From: pgsql-performance-owner(at)postgresql(dot)org
[mailto:pgsql-performance-owner(at)postgresql(dot)org] On Behalf Of Michael Adler
Sent: Wednesday, February 23, 2005 3:04 PM
To: John Allgood
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] Peformance Tuning Opterons/ Hard Disk Layout

On Wed, Feb 23, 2005 at 11:39:27AM -0500, John Allgood wrote:
> Hello All
>    I am setting up a hardware clustering solution. My hardware is Dual 
> Opteron 550 with 8GB ram. My external storage is a Kingston Fibre 
> channel Infostation. With 14 15000'k 36GB drives. The OS we are running 
> is Redhat ES 3.0. Clustering using Redhat Cluster Suite.  Postgres 
> Version is Postgres 7.4.7. We will be setting up about 9 databases which 
> range in size from 100MB to 2.5GB on the config. The postgres 
> application is mostly read intensive.  What would be the best way to 
> setup the hardrives on this server. Currently I have it partioned with 2 
> seperate raid 5 with 1 failover per raid. I have two database clusters 
> configured with a seperate postmaster running for each. Running two 
> postmasters seems like a pain but that is the only way I knew to 
> seperate the load. I am mostly concerned about disk IO and performance. 
> Is my current setup a good way to accomplish the best performance or 
> would it be better to use all the drives in one huge raid five with a 
> couple of failovers. I have looked around in the archives and found some 
> info but I would like to here about some of the configs other people are 
> running and how they have them setup.

Consider a separate array for pg_xlog. 

With tablespaces in 8.0, you can isolate much of the IO in a single

 -Mike Adler

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Subject: Re: Peformance Tuning Opterons/ Hard Disk Layout
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