How to run tests in parallel in Django?

According to the Django 3.0 documentation there is a --parallel option that you can use.

--parallel [N] Runs tests in separate parallel processes. Since modern processors have multiple cores, this allows running tests significantly faster.

So you can use the following command to execute the tests in parallel.

python manage.py test --parallel

You can adjust the number of processes either by providing it as the option’s value, e.g. --parallel=4, or by setting the DJANGO_TEST_PROCESSES environment variable.

This can help considerably reduce your test execution time if you have a large Django project with quite a few test unit cases.

Since Django 1.9 it's possible to run the tests in parallel by Django with its built-in unit-test features.

Django Docs: https://docs.djangoproject.com/en/3.0/ref/django-admin/#cmdoption-test-parallel

You can use a parallel test runner for Django and Twisted described here: http://www.tomaz.me/2011/04/03/making-django-and-twisted-tests-faster.html (the source lives here https://github.com/Kami/parallel-django-and-twisted-test-runner - link at the end of the post). You can use it as described in Django docs on testing.

There is also a nose parallel test runner.