multiprocessing windows RuntimeError spawn.py
SICOR crashes on Windows if running in multiprocessing:
2021/02/09 11:01:21: Applying empirical line solution to extrapolate L2A data pixelwise...
100%|██████████| 200/200 [00:00<00:00, 5273.47it/s]
Traceback (most recent call last):
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\spawn.py", line 114, in _main
prepare(preparation_data)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\spawn.py", line 225, in prepare
_fixup_main_from_path(data['init_main_from_path'])
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\spawn.py", line 277, in _fixup_main_from_path
run_name="__mp_main__")
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\runpy.py", line 263, in run_path
pkg_name=pkg_name, script_name=fname)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\runpy.py", line 96, in _run_module_code
mod_name, mod_spec, pkg_name, script_name)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "Z:\Programs\Python\EnPT\test_max\enpt_run1.py", line 19, in <module>
CTR.run_all_processors()
File "Z:\Programs\Python\EnPT\enpt\execution\controller.py", line 170, in run_all_processors
self.run_atmospheric_correction()
File "Z:\Programs\Python\EnPT\enpt\execution\controller.py", line 141, in run_atmospheric_correction
self.L1_obj.run_AC()
File "Z:\Programs\Python\EnPT\enpt\model\images\images_sensorgeo.py", line 728, in run_AC
AC.run_ac(self)
File "Z:\Programs\Python\EnPT\enpt\processors\atmospheric_correction\atmospheric_correction.py", line 100, in run_ac
sicor_ac_enmap(enmap_l1b=enmap_ImageL1, options=options, logger=enmap_ImageL1.logger)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\site-packages\sicor\sicor_enmap.py", line 143, in sicor_ac_enmap
processes=fo_enmap.cpu)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\site-packages\sicor\Tools\EnMAP\segmentation.py", line 119, in empirical_line_solution
with Pool(processes=processes) as pool:
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\context.py", line 119, in Pool
context=self.get_context())
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\pool.py", line 174, in __init__
self._repopulate_pool()
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\pool.py", line 239, in _repopulate_pool
w.start()
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\process.py", line 105, in start
self._popen = self._Popen(self)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\context.py", line 322, in _Popen
return Popen(process_obj)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\popen_spawn_win32.py", line 33, in __init__
prep_data = spawn.get_preparation_data(process_obj._name)
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\spawn.py", line 143, in get_preparation_data
_check_not_importing_main()
File "C:\Users\brell\Anaconda3\envs\enpt_env\lib\multiprocessing\spawn.py", line 136, in _check_not_importing_main
is not going to be frozen to produce an executable.''')
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.
Edited by Daniel Scheffler