If I want to run 15 spatial joins at the same time, would it be better to use threading or multiprocessing? I've implemented threading already in a test and it cut 50 minutes (running sequentially) down to 15 minutes (running in concurrent threads). What is best practice in this case? Threading seems to work just dandy but if its not the recommended module for concurrent processing with ArcGIS I'll make the minor changes needed.
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