[geos-devel] Nightly build performance

James.Sewell at lisasoft.com James.Sewell at lisasoft.com
Sun Feb 20 20:02:31 EST 2011


6774 was the 2.0 SVN id.

I will test again with no indexes later when my machine is idle.

James Sewell 

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-----Original Message-----
From: geos-devel-bounces at lists.osgeo.org [mailto:geos-devel-bounces at lists.osgeo.org] On Behalf Of Sandro Santilli
Sent: Friday, 18 February 2011 6:23 PM
To: GEOS Development List
Subject: Re: [geos-devel] Nightly build performance

On Fri, Feb 18, 2011 at 01:52:47PM +1030, James.Sewell at lisasoft.com wrote:

> The issue I have noticed is that the newer version is noticeably (more than 5x) slower on some large queries of the form:
> 	SELECT a.geom FROM left AS a, right AS b    
> 		WHERE st_intersects(a.the_geom, b.the_geom);
> Have there been changes in this area of the code? Is this expected for nightly builds? Is there anything I can do to help troubleshooting of the issue? All my tables are imported and indexed by the same tool in both instances.

If you can, compare again, using _st_intersects (skips the index).
And keep track of GEOS svn id of the source if they are different.


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