FastAPI: Thread Pool and Event Loop

FastAPI runs synchronous routes in a thread pool, isolating them from the main event loop.

To clarify the concepts of “thread pool” and “event loop,” and how FastAPI utilizes them, let’s delve into each concept and their application in web frameworks like FastAPI.

https://github.com/mazzasaverio/fastapi-your-data

Event loop

An event loop is a programming construct that waits for and dispatches events or messages in a program. It’s a core part of asynchronous programming, allowing a program to perform other tasks while waiting for an I/O (Input/Output) operation to complete. The event loop manages asynchronous operations by “pausing” an operation that’s waiting for I/O to complete and “resuming” it once the I/O operation is done, without blocking the execution of other operations.

The event loop is primarily a conceptual model used in software development to efficiently handle asynchronous operations. It’s not a physical component within a computer nor strictly an architectural element, but rather a programming pattern implemented within certain programming languages and their runtime environments. The event loop enables a program to perform non-blocking I/O operations, meaning it can continue to execute other tasks while waiting for some operations, like network requests or…