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My understanding is that historically, the python Interpreter counted lines of code executed and switched threads after a fixed amount. This was then changed to being time dependent.

What I am trying to figure out is how is the time checked for the current threads running duration? Does time duration get called after every line is executed?

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  • See github.com/python/cpython/blob/… for the implementation. Looks like there's a separate unlocking thread. Commented Jun 3, 2024 at 13:24
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    It has never been lines of code executed - that's not something the interpreter can easily access. Instead, it has traditionally been the number of bytecode instructions executed, with the default value being 100 as I recall (but I'm sure that value has changed over the years, and has always been adjustable via the sys module). With the change to a time-based thread switch interval, I would guess that the check is still in the same place, at the top of the bytecode-executing loop, but I couldn't find it in a quick look. Commented Jun 3, 2024 at 13:39
  • If you check it every time a byte code operation is executed, isn't that highly inefficient? Commented Jun 3, 2024 at 22:09
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