Free-threaded Python allows threads to run in parallel without yielding to one another, marking a significant change in CPython's architecture since its inception. Python 3.14 beta 3 has officially brought support for this feature. Developers can now explore true parallelism in Python, focusing on use cases where threading provides an advantage. Tasks that are embarrassingly parallel are ideal for threading, although not all problems benefit from this approach, as some tasks may remain better suited to serial processing.
The introduction of free-threaded or 'no-GIL' builds in Python 3.13 was one of the biggest architectural changes to the CPython interpreter since its creation.
The availability of a free-threaded build is also one of the most potentially disruptive changes to Python, throwing many assumptions about how Python programs handle threading out the window.
Threads in any language take a divide-and-conquer approach to any task. Anything that is 'embarrassingly parallel' is a good fit for threads.
Some problems may simply lose in another way whatever they gained from threading. As an example, if you have a job that writes a lot of files, having each job in its own thread is less effective if each job also writes the file.
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