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Parallel Python

A lecture from ASPP 2025. The slides and exercises are in slides/ and exercises/, respectively.

Lecture outline

Processes, threads and THE GIL
Hands-on investigations of embarrassingly parallel problems
A. Multithreading with NumPy
B. The multiprocessing package
C. Blending processes and threads
Going further

A really cool example of using asyncio with the kitchen program is in extras/.

Online textbook on operating systems, processes, threads, etc.
- Operating Systems: Three Easy Pieces
- Chapters 4, 13, and 26 are particularly relevant.
- But the whole book is interesting.
Report of a talk on Python concurrency types, with focus on sub-interpreters.
- Python subinterpreters and free-threading
Comparison of multithreading, multiprocessing, and asyncio.
- Async Python: The Different Forms of Concurrency
- Note the code snippets are a little outdated.
Example of webscraping with asyncio
- Asynchronous Web Scraping in Python - ZenRows
Sub-interpreters in 3.12
- Sub-interpreter web workers