georaster-Poor performance on large dataset

[ilucena]

The poor performance on large dataset is mostly because it is creating a very large array of loblocator on the server side with all the RTD rows of the GeoRaster.

That affects the process of loading and extracting data but mostly significantly on visualization applications when it also has to deal with pyramids rows on the RDT.

[ilucena]

There is an experimental version of the code that is on:

http://trac.osgeo.org/gdal/browser/sandbox/ilucena/georaster

That is what we are using for FOSS4G2010 benchmarking:

​http://wiki.osgeo.org/wiki/Benchmarking_2010#MapServer

It passed the gdal_autotest successfully but it would need more testing before committing it to the trunk.

[ilucena]

Correction: "That *dos not* affects the process of loading and extracting data but mostly significantly on visualization applications when it also has to deal with pyramids rows on the RDT."

The very large array of loblocator has not been a problem for well tuned system.