[gdal-dev] RasterIO slower on Windows

[Adam Kubach]

Even,

Yes, this is on the same machine.  The driver is GeoTIFF (I haven't
tried other ones) with external overviews.

Adam

On Fri, Dec 11, 2009 at 12:41 PM, Even Rouault
<even.rouault at mines-paris.org> wrote:
> 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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>>
>>
>>
>
>
>