[gdal-dev] RasterIO slower on Windows

[Even Rouault]

Adam,

I assume that you're testing on the same machine. Such difference is not 
expected. Do you see that slowdown with different GDAL drivers or just 
for one in particular (which one?)

Windows builds are able to use overviews. But are you speaking about 
internal GeoTIFF overviews or about external overviews (.ovr files) ?

Even

Adam Kubach a écrit :
> Hi,
>
> It appears that my calls to RasterIO are about 10 times slower on
> Windows than Linux when reading from the same dataset.  I wouldn't
> think that there would be a noticeable difference.  Has anyone else
> seen this?  Is it possible that the overviews aren't being used on
> Windows?  Is there anyway I can verify that they are being used (Other
> than a debugger)?
>
> Thanks,
> Adam
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