[Tim\
> For the current obmalloc, I have in mind a different way ...
> Not ideal, but ... captures the important part (more objects
> in a pool -> more times obmalloc can remain in its
> fastest "all within the pool" paths).

And now there's a PR that removes obmalloc's limit on pool sizes, and,
for a start, quadruples pool (and arena!) sizes on 64-bit boxes:

https://github.com/python/cpython/pull/13934

https://bugs.python.org/issue37211

As the PR says,

"""
It would be great to get feedback from 64-bit apps that do massive
amounts of small-object allocations and deallocations.
"""

:-)
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