[Python-ideas] Adding a frame evaluation API to CPython

Brett Cannon brett at python.org
Tue May 17 11:11:44 EDT 2016

On Mon, 16 May 2016 at 16:13 Matthias welp <boekewurm at gmail.com> wrote:

> I won't comment on the content of this proposal, as I'm don't really see
> the implications, but I would like to correct one small mistake:
> Under 'performance impact' you say this:
> > In terms of memory impact, since there are typically not many CPython
> interpreters executing in a single process that means the impact of
> co_extra being added to PyCodeObject is the only worry. According to
> https://github.com/Microsoft/Pyjion/blob/master/pep.rst#code-object-count,
> a run of the Python test suite results in about 72,395 code objects being
> created. On a 64-bit CPU that would result in 4,633,280 bytes of extra
> memory being used if all code objects were alive at once and had nothing
> set in their co_extra fields.
> The extra RAM used is a bit off. One 64-bit pointer extra takes only 8
> bytes, which translates to about 579160 bytes extra used in in the test
> suite. I did not consider padding for accessibility, but that was also not
> considered in the draft.

Oops, my mistake. Thanks for pointing it out!


> -Matthias
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