Demystifying AsyncIO: Building Your Own Event Loop in Python
summary
Builds an event loop from scratch in Python and actually runs a FastAPI HTTP server on it, printing a Hello World response; measures show the homemade loop is 97% slower than the CPython default while replacing the loop with uvloop 2–4x faster narrows the gap. Uses selectors, Futures, Tasks, scheduling queues, and simple benchmarks via the cpit project to compare performance and demonstrate what parts are costly and which optimizations matter.
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chapters (8)
- 0:00Introduction
- 5:19Scheduling callbacks
- 8:50Futures
- 10:38Aseno Helpers
- 12:39AsyncIO
- 15:28Syntax
- 18:49Performance
- 23:24Questions
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