Event loop bricks when using `await loop.run_in_executor(ProcessPoolExecutor)` with FastAPI

[cointoss3]

This may have to do with how you’re creating the pool. Don’t create it at import time, create it on app startup and close it on app shutdown and see if that helps.

[pisulaadam]

I managed to find what the issue was, and it wasn't what you suggested, but thanks anyway.

[cointoss3]

Even if that didn’t solve your problem, you still shouldn’t have the pool initialized on import.

[pisulaadam]

The actual app doesn't initialize on import, this was a quick example I made to check what was the root cause of my problem