Is it possible to run a standalone PyQGIS script using multiprocessing for better performance?
I'm creating 1,800 rendered map images and would like to run it across 4 processes to speed it up.
If I try to instantiate 4 QgsApplication objects using the following code (one in each process) - they fail silently (i.e. nothing happens and no CPU/hard drive/memory is being used).
QgsApplication.setPrefixPath("/Applications/QGIS3.8.app/Contents/MacOS", True) app = QgsApplication(, False) app.initQgis()
If I instantiate it once and then run the 4 processes - I get a "QgsApplication couldn't be pickled" error.
The code uses Python's multiprocessing module to create the parallel processes; using pool.imap_unordered
I'm using QGIS 3.8.2 and Python 3.7.3 on a Mac with MacOS 10.14.6 (Mojave).