Creating test databases in parallel

[cool-RR]

Hi guys,

I'm trying to optimize our Django testing workflow.

We have 7 different databases, and Django spends a lot of time on these lines: 

Creating test database for alias 'main_database'...

Creating test database for alias 'foo_database'...

Creating test database for alias 'bar_database'...

Creating test database for alias 'baz_database'...

This is especially annoying when you're running just one test, but have to wait 1:30 minutes just for these test databases.

Is there any way to speed this up? Either by parallelizing it or in any other way. A few months ago I tried some naive code that parallelizes these actions, but it failed. (Unfortunately I don't have the error message saved.)

Thanks,

Ram.

[Motaz Hejaze]

Long article somehow , but very informative ...

https://realpython.com/python-concurrency/

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[Ram Rachum]

This is a general article about concurrency in Python. I'm very good with concurrency in Python, I'm asking about a specific case here.

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[Thomas Lockhart]

If you are trying to optimize the test flow, then you may want to spend some time shrinking your test databases to a more manageable size. Or have two sets; abbreviated and full, with the larger one to exercise your (unknown) edge cases.

hth

- Tom

[Ram Rachum]

When you say "shrinking your test databases", what do you mean exactly? I'm a bit of a newbie on that part of Django.

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