Here's where it's all defined in case you're interested in what's going on under the hood: https://github.com/quantumblacklabs/kedro/blob/ded55eb824af25ea28ea9f5249317693a9b1574d/kedro/runner/parallel_runner.py#L26-L72. Just don't ask me how it works though since I've never actually looked at this code before 😄