What does HackerNews think of nogil?

Real Multithreading Is Coming to Python | May 2023

https://github.com/colesbury/nogil does manage to get rid of the GIL, but it's not certain to make it into Python core. The main problem is the amount of existing libraries that depend on the existence of the GIL without realizing it - breaking those would be extremely disruptive.

Real Multithreading Is Coming to Python | May 2023

Important to note that this is different from the nogil project ( https://github.com/colesbury/nogil ) - this is about the feature that's landing soon in Python 3.12 which will allow multiple Python sub-interpreters each with their own GIL - hence enabling Python code to run multi-threaded in the same process, albeit with a fair amount of extra work to co-ordinate between those different interpreters.

The tutorial itself is fantastic - it's not an easy feature to try out right now but I got there by following the step-by-step instructions.

Also interesting is this project, linked to from the end of the tutorial: https://github.com/jsbueno/extrainterpreters

Posted my own set of short notes on my blog: https://simonwillison.net/2023/May/15/per-interpreter-gils/

PEP 684 was accepted – Per-interpreter GIL in Python 3.12 | Apr 2023

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"PEP 703 – Making the Global Interpreter Lock Optional in CPython" (2023) https://github.com/python/peps/blob/main/pep-0703.rst https://peps.python.org/pep-0703/

colesbury/nogil https://github.com/colesbury/nogil :

  docker run -it nogil/python
  docker run -it nogil/python-cuda

Python 3.11.0 final | Oct 2022

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I'm worried about the speedup

My understanding is that it's based on the most recent attempt to remove the GIL by Sam Gross

https://github.com/colesbury/nogil

In addition to some ways to try to not have nogil have as much overhead he added a lot of unrelated speed improvements so that python without the gil would still be faster not slower in single thread mode. They seem to have merged those performance patches first that means if they add his Gil removal patches in say python 3.12 it will still be substantially slower then 3.11 although faster then 3.10. I hope that doesn't stop them from removing the gil (at least by default)

Faster CPython 3.12 Plan | Sep 2022

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Looks like it's still active to me:

https://github.com/colesbury/nogil/

Python 3.11 vs 3.10 performance | Jul 2022

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I think you mean the work by Sam Gross:

https://github.com/colesbury/nogil/

Interesting article about it here:

https://lukasz.langa.pl/5d044f91-49c1-4170-aed1-62b6763e6ad0...

Python 3.11 is 25% faster than 3.10 on average | Jul 2022

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