Async pitfalls in python - non preemptive event loop

This a simple async webserver to demonstrate a pitfall of the python async framework: non-preemptive scheduling.

The blog post explaining this is here. (still to do).

How to run the webserver

This has been run on ubuntu 20.04.

Prerequesites

You will need python >= 3.8, poetry and curl

Install the dependencies

cd example_webserver
poetry install

Run the webserver

cd example_webserver
poetry run uvicorn example:app

Run the health check script

./liveness_probe.sh

Simulate a single long running request

curl localhost:8000/processing

Simulate several long running requests

For example send 10 requests to the processing endpoint

./send_requests.sh 10 processing

or send 25 requests to the processing_fixed endpoint

./send_requests.sh 25 processing_fixed