[Gdal-dev] Re: JP2KAK Driver Optimization

Frank Warmerdam warmerdam at pobox.com
Fri Feb 9 12:21:11 EST 2007

Rahkonen Jukka wrote:
> Frank Warmerdam  writes:
>> Folks,
>> I have implemented optimized IRasterIO() functions on the JP2KAK driver.
>> This can give a substantial speed up (as much as a factor of 3) for for
>> applications making single big windowed requests.  However, it can also
>> result in substantial negative performance characteristics for applications
>> many small requests.
>> I don't consider this optimized driver all that safe, and I don't plan to
>> take it back to the gdal 1.4 branch for the time being.  I would appreciate
>> feedback from folks using it.
> Hi,
> Is there any simple way to test this new driver with MapServer?  I have a ready
> made test set available and MapServer from FWTools including the old JP2KAK and
> JP2ECW drivers to compare with. 


If you can wait a while there will be a new FWTools release that includes
the driver, and then it should be easy to compare performance to older
releases.  I'm not sure when the next fwtools cut will be though.  I just
pushed out 1.2.1 yesterday before finishing the jp2kak work. :-)

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGeo, http://osgeo.org

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