#31169: Parallel test mode not working on MacOS with recent versions of Python 3
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Reporter: Brandon Navra | Owner: nobody
Type: Bug | Status: new
Component: Testing framework | Version: 3.0
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Description changed by Brandon Navra:
Old description:
> 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.
New description:
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.
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Ticket URL: <https://code.djangoproject.com/ticket/31169#comment:1>
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