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Re: New to PostgreSQL, performance considerations

From: Greg Smith <gsmith(at)gregsmith(dot)com>
To: Postgresql Performance list <pgsql-performance(at)postgresql(dot)org>
Subject: Re: New to PostgreSQL, performance considerations
Date: 2006-12-15 14:50:15
Message-ID: Pine.GSO.4.64.0612150945440.7368@westnet.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Fri, 15 Dec 2006, Merlin Moncure wrote:

> The slower is probably due to the unroll loops switch which can
> actually hurt code due to the larger footprint (less cache coherency).

The cache issues are so important with current processors that I'd suggest 
throwing -Os (optimize for size) into the mix people test.  That one may 
stack usefully with -O2, but probably not with -O3 (3 includes 
optimizations that increase code size).

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

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