[geos-devel] Nightly build performance

[Sandro Santilli]

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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