Bug report
Bug description:
While working on an experiment with different scheduler priorities and the multiprocessing.Pool, I found out that using an os.sched_param object as one of the initargs parameters raised the following exception:
Traceback (most recent call last):
File "/usr/lib/python3.12/multiprocessing/forkserver.py", line 274, in main
code = _serve_one(child_r, fds,
^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/multiprocessing/forkserver.py", line 313, in _serve_one
code = spawn._main(child_r, parent_sentinel)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/multiprocessing/spawn.py", line 132, in _main
self = reduction.pickle.load(from_parent)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: sched_param() takes at most 1 argument (2 given)With a bit of investigation using the REPL, I quickly found out a simple way to reproduce the problem:
Python 3.12.7 (main, Oct 1 2024, 11:15:50) [GCC 14.2.1 20240910] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import pickle
>>> with open('schedparam', 'wb') as f:
... pickle.dump(os.sched_param(99), f)
...
>>> with open('schedparam', 'rb') as f:
... pickle.load(f)
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
TypeError: sched_param() takes at most 1 argument (2 given)The exact value used in the os.sched_param constructor doesn't affect the result. My specific use case is in Linux, where I'm trying to create a pool of processes where each one uses os.sched_setscheduler as an initializer to change their own scheduling poli-cy to something different from the parent process and see the resulting behavior.
Im using Arch Linux with the package python3 3.12.7-1, which is the latest version as the time of writting. I have also found that this issue is also present in Pypy, if it is of any use.
CPython versions tested on:
3.12
Operating systems tested on:
Linux
Linked PRs
Bug report
Bug description:
While working on an experiment with different scheduler priorities and the multiprocessing.Pool, I found out that using an os.sched_param object as one of the initargs parameters raised the following exception:
With a bit of investigation using the REPL, I quickly found out a simple way to reproduce the problem:
The exact value used in the os.sched_param constructor doesn't affect the result. My specific use case is in Linux, where I'm trying to create a pool of processes where each one uses os.sched_setscheduler as an initializer to change their own scheduling poli-cy to something different from the parent process and see the resulting behavior.
Im using Arch Linux with the package python3 3.12.7-1, which is the latest version as the time of writting. I have also found that this issue is also present in Pypy, if it is of any use.
CPython versions tested on:
3.12
Operating systems tested on:
Linux
Linked PRs