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Re: More shared buffers causes lower performances

From: Simon Riggs <simon(at)2ndquadrant(dot)com>
To: Guillaume Smet <guillaume(dot)smet(at)gmail(dot)com>
Cc: pgsql-performance <pgsql-performance(at)postgresql(dot)org>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
Subject: Re: More shared buffers causes lower performances
Date: 2007-12-26 11:21:05
Message-ID: 1198668065.4221.288.camel@ebony.site (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, 2007-12-26 at 01:06 +0100, Guillaume Smet wrote:

> I lowered the number of concurrent clients to 50 because 100 is quite
> high and I obtain the same sort of results:
> shared_buffers=32MB: 1869 tps
> shared_buffers=64MB: 1844 tps
> shared_buffers=512MB: 1676 tps
> shared_buffers=1024MB: 1559 tps

Can you try with

bgwriter_lru_maxpages = 0

So we can see if the bgwriter has any hand in this?

-- 
  Simon Riggs
  2ndQuadrant  http://www.2ndQuadrant.com


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