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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