Are you using OS X? Could this possibly be due to how Python handles multiprocessing on OS X vs. other platforms? (See https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods, in particular the comment "On macOS, the *spawn* start method is now the default" and https://bugs.python.org/issue33725.)
On Tuesday, January 25, 2022 at 12:34:07 PM UTC-8 alan_thoma...@yahoo.co.uk wrote: > Process SpawnPoolWorker-1: Traceback (most recent call last): File > "/private/var/tmp/sage-9.5-current/local/var/lib/sage/venv-python3.9.9/lib/python3.9/multiprocessing/process.py", > > line 315, in _bootstrap self.run() File > "/private/var/tmp/sage-9.5-current/local/var/lib/sage/venv-python3.9.9/lib/python3.9/multiprocessing/process.py", > > line 108, in run self._target(*self._args, **self._kwargs) File > "/private/var/tmp/sage-9.5-current/local/var/lib/sage/venv-python3.9.9/lib/python3.9/multiprocessing/pool.py", > > line 114, in worker task = get() File > "/private/var/tmp/sage-9.5-current/local/var/lib/sage/venv-python3.9.9/lib/python3.9/multiprocessing/queues.py", > > line 368, in get return _ForkingPickler.loads(res) File > "/private/var/tmp/sage-9.5-current/local/var/lib/sage/venv-python3.9.9/lib/python3.9/site-packages/sage/manifolds/differentiable/chart.py", > > line 36, in <module> > On Tuesday, January 25, 2022 at 8:13:20 PM UTC egourg...@gmail.com wrote: > >> Hi, >> >> Le mardi 25 janvier 2022 à 12:54:57 UTC+1, alan_thoma...@yahoo.co.uk a >> écrit : >> >>> I get errors in this notebook if I set the variable tpar to any value >>> greater than one. (Number of Tensor processing cores.) >>> >>> *http://alan.atstafford.co.uk/Sage9.5Problem.ipynb >>> <http://alan.atstafford.co.uk/Sage9.5Problem.ipynb>* >>> >> >> Your notebook works well with tpar=4 on my Ubuntu computer running Sage >> 9.5.rc4. >> What kind of error do you get? >> >> Eric. >> > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/4e5362fc-05b2-48ac-9783-66e6e70d6f21n%40googlegroups.com.
