#31169: Parallel test mode not working on MacOS with recent versions of Python 3
---------------------------------------------+------------------------
Reporter: Brandon Navra | Owner: nobody
Type: Bug | Status: new
Component: Testing framework | Version: 3.0
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
---------------------------------------------+------------------------
Python 3.8 on MacOS has changed the default start method for the
multiprocessing module from `fork` to `spawn`:
https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-
methods.
When running tests with the `--parallel` flag, this causes the worker
processes to fail with {{{django.core.exceptions.AppRegistryNotReady: Apps
aren't loaded yet.}}} as they no longer have a copy of the parent memory
state. It can also cause the workers to fail to find the cloned dbs
({{django.db.utils.OperationalError: FATAL: database "xxx_1" does not
exist}}) as the db test prefix is missing.
I have attached a patch which changes `django.test.runner._init_worker`
(the worker initialiser for `ParallelTestSuite`) to run django.setup() and
set the db name to one with the `test_` prefix.
--
Ticket URL: <https://code.djangoproject.com/ticket/31169>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/053.b790104c27169a001014939d3999aa3b%40djangoproject.com.
