Hi, Have a look at this gis.stackexchange question https://gis.stackexchange.com/questions/415925/error-in-gdal2tiles-with-processes. Question is about using gdal2tiles with QGIS but the issue is reproduced also with OSGeo4w. Is there something changed in multiprocessing between Python versions 3.7 and 3.9, or is something else failing with errors:
RuntimeError: An attempt has been made to start a new process before the current process has finished its bootstrapping phase. This probably means that you are not using fork to start your child processes and you have forgotten to use the proper idiom in the main module: if __name__ == '__main__': freeze_support() ... The "freeze_support()" line can be omitted if the program is not going to be frozen to produce an executable. Traceback (most recent call last): File "<string>", line 1, in <module> File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\multiprocessing\spawn.py", line 116, in spawn_main exitcode = _main(fd, parent_sentinel) File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\multiprocessing\spawn.py", line 125, in _main prepare(preparation_data) File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\multiprocessing\spawn.py", line 236, in prepare _fixup_main_from_path(data['init_main_from_path']) File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\multiprocessing\spawn.py", line 287, in _fixup_main_from_path main_content = runpy.run_path(main_path, File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\runpy.py", line 268, in run_path return _run_module_code(code, init_globals, run_name, File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\runpy.py", line 97, in _run_module_code _run_code(code, mod_globals, init_globals, File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\runpy.py", line 87, in _run_code exec(code, run_globals) File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\Scripts\gdal2tiles.py", line 11, in <module> sys.exit(main(sys.argv)) File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\site-packages\osgeo_utils\gdal2tiles.py", line 3257, in main multi_threaded_tiling(input_file, output_folder, options) File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\site-packages\osgeo_utils\gdal2tiles.py", line 3206, in multi_threaded_tiling pool = Pool(processes=nb_processes) File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\multiprocessing\context.py", line 119, in Pool return Pool(processes, initializer, initargs, maxtasksperchild, File "C:\PROGRA~1\QGIS32~1.0\apps\Python39\lib\multiprocessing\pool.py", line 212, in __init__ self._repopulate_pool() -Jukka Rahkonen-
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