[geos-devel] speed difference between release and debug builds

[Pete Gerritson]

I've noticed some large performance differences between debug and release 
builds using VC 8.0 when stl containers are used (not specifically with 
geos, but in general).  I believe iterator debugging is enabled by default 
in debug builds.  See 
http://msdn2.microsoft.com/en-us/library/Aa985939(VS.80).aspx for more info. 
You might try turning this off and see what effect it has.

Pete

----- Original Message ----- 
From: "Fabian Hohmuth" <fabian.hohmuth at pixelgrammetry.com>
To: "GEOS Development List" <geos-devel at geos.refractions.net>
Sent: Thursday, October 11, 2007 2:41 PM
Subject: [geos-devel] speed difference between release and debug builds


> Hi all,
>
> we're using GEOS via the C API under Windows (doing unions on a number of 
> complex polygons) and noticed that there is a major (3x) speed difference 
> between the Release and Debug builds. I somehow can't believe that the 
> compiler optimization is that good. The defined preprocessor symbols are 
> the same between the two configurations. Any hints where this could come 
> from?
>
> Thanks,
> - Fabian
>
>
>
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