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

[Mateusz Loskot]

Pete,

This shouldn't be any surprise.
Performance observations using non-optimized (debug) builds do not make
much sense. Debug builds are for debugging but not for benchmarking.

Cheers

Pete Gerritson wrote:
> 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



-- 
Mateusz Loskot
http://mateusz.loskot.net