On 2019-06-21, Tim Peters wrote:
> [Thomas Wouters <tho...@python.org>]
> > Getting rid of address_in_range sounds like a nice idea, and I
> > would love to test how feasible it is -- I can run such a change
> > against a wide selection of code at work, including a lot of
> > third-party extension modules, but I don't see an easy way to do
> > it right now.
> 
> Neil's branch is here:
> 
>      https://github.com/nascheme/cpython/tree/obmalloc_radix_tree

If you can test vs some real-world programs, that would be great.
I was trying to run some tests this afternoon.  Testing with Python
3.8+ is a pain because of the PyCode_New and tp_print changes.  I've
just added two fixes to the head of the obmalloc_radix_tree branch
so that you can compile code generated by old versions of Cython.
Without those fixes, building 3rd party extensions can be a real
pain.

> My PR uses 16K pools and 1M arenas, quadrupling the status quo.
> Because "why not?" ;-)
> 
> Neil's branch has _generally_, but not always, used 16 MiB arenas.
> The larger the arenas in his branch, the smaller the radix tree needs
> to grow.

Currently I have it like your big pool branch (16 KB, 1MB).
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