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Re: 8.4 open item: copy performance regression?

From: Greg Smith <gsmith(at)gregsmith(dot)com>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alan Li <ali(at)truviso(dot)com>
Subject: Re: 8.4 open item: copy performance regression?
Date: 2009-06-22 20:33:23
Message-ID: alpine.GSO.2.01.0906221626500.2428@westnet.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Mon, 22 Jun 2009, Kevin Grittner wrote:

> When I tried with setting the ring size to 16MB, I accidentally left off 
> the step to copy the postgresql.conf file, and got better performance.

Do you have happen to have a build with assertions turned on?  That is one 
common cause of performance going down via increased shared_buffers that 
people tend to run into during beta.

You can check via psql with

   show debug_assertions;

--
* Greg Smith gsmith(at)gregsmith(dot)com http://www.gregsmith.com Baltimore, MD

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Subject: Re: 8.4 open item: copy performance regression?
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