Add an LRU Cache to the convolution worker #411
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…/373-add-lrucache-to-convolve2d Conflicts: HISTORY.rst
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Reading pixel values during the convolution worker's execution allows us a bit of a speedup. On a ~3GB signal raster with a 200px-by-200px kernel raster, I'm seeing speedups of about 10%. There remain interesting opportunities for us to optimize further by more carefully considering spatial locality in scheduling of blocks for the worker.
Fixes #373