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Re: [PERFORM] Releasing memory during External sorting?

From: Simon Riggs <simon(at)2ndquadrant(dot)com>
To: Ron Peacetree <rjpeace(at)earthlink(dot)net>
Cc: pgsql-hackers(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org
Subject: Re: [PERFORM] Releasing memory during External sorting?
Date: 2005-09-25 17:45:30
Message-ID: 1127670330.19345.84.camel@localhost.localdomain (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-performance
On Fri, 2005-09-23 at 12:48 -0400, Ron Peacetree wrote:

> > I have some indications from private tests that very high memory settings
> >may actually hinder performance of the sorts, though I cannot explain that
> >and wonder whether it is the performance tests themselves that have issues.
> >
> Hmmm.  Are you talking about amounts so high that you are throwing the OS
> into paging and swapping thrash behavior?  If not, then the above is weird.

Thanks for your thoughts. I'll retest, on the assumption that there is a
benefit, but there's something wrong with my earlier tests.

Best Regards, Simon Riggs



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