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On Mon, Aug 8, 2016 at 3:25 PM, Victor Stinner <victor.stinner@gmail.com> wrote:

tl;dr I found a way to make CPython 3.6 faster and I validated that
there is no performance regression.

But is there a performance improvement?

I'm requesting approval of core
developers to start pushing changes.

In 2014 during a lunch at Pycon, Larry Hasting told me that he would
like to get rid of temporary tuples to call functions in Python. In
Python, positional arguments are passed as a tuple to C functions:
"PyObject \*args". Larry wrote Argument Clinic which gives more control
on how C functions are called. But I guess that Larry didn't have time
to finish his implementation, since he didn't publish a patch.

Hm, I agree that those tuples are probably expensive. I recall that IronPython boasted faster Python calls by doing something closer to the platform (in their case I'm guessing C# or the CLR :-).

Is this perhaps something that could wait until the Core devs sprint in a few weeks? (I presume you're coming?!)

--Guido van Rossum (python.org/\~guido)