Hi all,
I'm working on a project where I need to iteratively buffer a source
geometry, clip it to another very complex geometry, and produce a series
of geometries representing the difference between each iteration. It is
simulating flow of water through a stream network.
The only way I can think of to produce each band is to use
currentGeometry.difference(previousGeometry).
This works ok but 99% of the processing time is taken up doing the
difference calculations.
Considering there is typically only a very small difference between
currentGeometry and previousGeometry I'm wondering whether there is a
more efficient way of calculating the difference.
I suspect the performance problem might be something to do with garbage
collection as it typically processes 1-4 iterations very quickly, then
spends a couple of minutes caught on a call to the difference method. A
couple of minutes on garbage collection seems a bit excessive but it's
got a 30GB heap. Are there known issues with the performance of
difference or is it just a notoriously inefficient operation to perform?
Thanks for any insight.
Mart
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