[Cython] Speed of cython.compile

Robert Bradshaw robertwb at math.washington.edu
Wed Sep 21 06:44:17 CEST 2011


2011/9/19 Stéfan van der Walt <stefan at sun.ac.za>:
> Hi all,
>
> I only recently found out that the mailing list had shifted, so I hope
> my message reaches you this time!
>
> On the current development version of Cython, the attached script
> makes Cython go into an infinite loop, but let's hope that's just on
> my machine.
>
> Regards
> Stéfan
>
> ---------- Forwarded message ----------
> Date: 2011/8/21
> Subject: Speed of cython.compile
> To: cython-dev at codespeak.net
>
> Hi all,
>
> I am trying to illustrate Cython's pure mode for a tutorial, and made
> up a quick fibonacci example (attached).  But when I run the timings,
> I get:
>
> Cython: 5.515417099
> Python: 0.123511791229
>
> When I compile the module by hand (.pyx -> .c -> .so) the timings are perfect:
>
> Cython: 0.0394787788391
> Python: 0.119538068771
>
> Any idea what's going on?  I cleared ~/.cython just to be sure, but
> that didn't help.

Up until https://github.com/cython/cython/commit/cc43e481654c802fb88620de45a3a14257911999
, @cython.compile didn't correctly interpret pure directives.
Statements like

@cython.compile
@cython.locals(n=int)
def fib(n):
   ...

are still on the todo list. Looks like I'm seeing the infinite loop
too; looking into it.

- Robert


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