New submission from Damian Barabonkov <dami...@mit.edu>:
The way the resource tracker is used in /Lib/multiprocessing/shared_memory.py leads to it issuing warnings/errors, even when resources are cleaned up properly. Attached are two simple demo files copied from the documentation example (https://docs.python.org/3.9/library/multiprocessing.shared_memory.html) that illustrate the warnings below: proc1.py Traceback (most recent call last): File "proc1.py", line 19, in <module> shm.unlink() # Free and release the shared memory block at the very end File "/home/damian/Documents/QuantCo/miniconda3/envs/pipeline-parallel/lib/python3.8/multiprocessing/shared_memory.py", line 244, in unlink _posixshmem.shm_unlink(self._name) FileNotFoundError: [Errno 2] No such file or directory: '/shmem' /home/damian/Documents/QuantCo/miniconda3/envs/pipeline-parallel/lib/python3.8/multiprocessing/resource_tracker.py:218: UserWarning: resource_tracker: There appear to be 1 leaked shared_memory objects to clean up at shutdown warnings.warn('resource_tracker: There appear to be %d ' /home/damian/Documents/QuantCo/miniconda3/envs/pipeline-parallel/lib/python3.8/multiprocessing/resource_tracker.py:231: UserWarning: resource_tracker: '/shmem': [Errno 2] No such file or directory: '/shmem' warnings.warn('resource_tracker: %r: %s' % (name, e)) proc2.py python3.8/multiprocessing/resource_tracker.py:218: UserWarning: resource_tracker: There appear to be 1 leaked shared_memory objects to clean up at shutdown warnings.warn('resource_tracker: There appear to be %d ' ---------- files: shmem_bug.py messages: 374621 nosy: damian.barabonkov priority: normal severity: normal status: open title: Resource Tracker in Multiprocessing Shared Memory not working correctly type: behavior versions: Python 3.8 Added file: https://bugs.python.org/file49351/shmem_bug.py _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41447> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
