How to control the parallelism or concurrency of an Airflow installation?

Question

In some of my Apache Airflow installations, DAGs or tasks that are scheduled to run do not run even when the scheduler doesn\'t appear to be fully loaded. How can I increase

Answer 1

An illustration for three major concurrency control variables:

https://airflow.apache.org/docs/stable/faq.html#how-can-my-airflow-dag-run-faster