Maciej Fijalkowski <fijall@gmail.com> wrote:I've tried cffi (admittedly only in a toy script) and find it very nice
> I would like to discuss on the language summit a potential inclusion
> of cffi[1] into stdlib. This is a project Armin Rigo has been working
> for a while, with some input from other developers.
to use.
Here's a comparison (pi benchmark) between wrapping libmpdec using a
C-extension (_decimal), cffi and ctypes:
+-------------------------------+----------+----------+---------+
| | _decimal | ctypes | cffi |
+===============================+==========+==========+=========+
| cpython-tip (with-system-ffi) | 0.19s | 5.40s | 5.14s |
+-------------------------------+----------+----------+---------+
| cpython-2.7 (with-system-ffi) | n/a | 4.46s | 5.18s |
+-------------------------------+----------+----------+---------+
| Ubuntu-cpython-2.7 | n/a | 3.63s | - |
+-------------------------------+----------+----------+---------+
| pypy-2.2.1-linux64 | n/a | 125.9s | 0.94s |
+-------------------------------+----------+----------+---------+
| pypy3-2.1-beta1-linux64 | n/a | 264.9s | 2.93s |
+-------------------------------+----------+----------+---------+
I guess the key points are that C-extensions are hard to beat and that
cffi performance on pypy-2 is outstanding. Additionally it's worth noting
that Ubuntu does something in their Python build that we should do, too.
+1 for cffi in the stdlib.
Stefan Krah
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