[issue39511] [subinterpreters] Per-interpreter singletons (None, True, False, etc.)

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

> The problem with having a single immortal `None`, is that it will
> cause data cache thrashing as two different CPUs modify the
> refcount on the shared `None` object.

That's a very reasonable theory. Personally, I find modern CPU architecture bewildering and unpredictable.  So I'd prefer it if somebody tests such performance claims, rather than simply asserting them and having that be the final design.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39511>
_______________________________________