Some issue due to multiprocessing #1
Description
Hi Jeremy.
I am using this new mountainsort4 for spikeinetrface new API.
But I have some issue link to multiprocessing/dask.
Is it something easy to fix ?
Traceback (most recent call last):
File "/home/samuel/Documents/SpikeInterface/spikeinterface/spikeinterface/sorters/basesorter.py", line 203, in run_from_folder
SorterClass._run_from_folder(output_folder, sorter_params, verbose)
File "/home/samuel/Documents/SpikeInterface/spikeinterface/spikeinterface/sorters/mountainsort4/mountainsort4.py", line 117, in _run_from_folder
old_api_sorting = mountainsort4.mountainsort4(
File "/home/samuel/.virtualenvs/py38/lib/python3.8/site-packages/mountainsort4/mountainsort4.py", line 38, in mountainsort4
MS4.sort()
File "/home/samuel/.virtualenvs/py38/lib/python3.8/site-packages/mountainsort4/ms4alg.py", line 842, in sort
dask.compute(*dask_list, num_workers=self._num_workers)
File "/home/samuel/.virtualenvs/py38/lib/python3.8/site-packages/dask/base.py", line 565, in compute
results = schedule(dsk, keys, **kwargs)
File "/home/samuel/.virtualenvs/py38/lib/python3.8/site-packages/dask/multiprocessing.py", line 197, in get
pool = context.Pool(num_workers, initializer=initialize_worker_process)
File "/usr/lib/python3.8/multiprocessing/context.py", line 119, in Pool
return Pool(processes, initializer, initargs, maxtasksperchild,
File "/usr/lib/python3.8/multiprocessing/pool.py", line 212, in __init__
self._repopulate_pool()
File "/usr/lib/python3.8/multiprocessing/pool.py", line 303, in _repopulate_pool
return self._repopulate_pool_static(self._ctx, self.Process,
File "/usr/lib/python3.8/multiprocessing/pool.py", line 326, in _repopulate_pool_static
w.start()
File "/usr/lib/python3.8/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
File "/usr/lib/python3.8/multiprocessing/context.py", line 284, in _Popen
return Popen(process_obj)
File "/usr/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 32, in __init__
super().__init__(process_obj)
File "/usr/lib/python3.8/multiprocessing/popen_fork.py", line 19, in __init__
self._launch(process_obj)
File "/usr/lib/python3.8/multiprocessing/popen_spawn_posix.py", line 42, in _launch
prep_data = spawn.get_preparation_data(process_obj._name)
File "/usr/lib/python3.8/multiprocessing/spawn.py", line 154, in get_preparation_data
_check_not_importing_main()
File "/usr/lib/python3.8/multiprocessing/spawn.py", line 134, in _check_not_importing_main
raise RuntimeError('''
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.