I am using Mac OS 12.1 Monterey. The notebook works on Sagemath 9.1 if I hack ncpus.py to return 4.
On Tuesday, January 25, 2022 at 10:59:20 PM UTC John H Palmieri wrote: > 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/fa566de4-5ac7-4f78-9064-2ac2bb450337n%40googlegroups.com.
