On Tue, Aug 2, 2011 at 11:09 AM, VictorMiller <victorsmil...@gmail.com> wrote:
> I've written a bunch of functions (some organized in classes) to do
> some large computations in a particular finite field (always GF(2^n)
> for some odd n). This seems to work fine. I'd like the computation
> to be as fast as possible, so the first thing I did was to copy
> the .py file to a .pyx file. The good news is that the compiled
> cython is at least 30% faster (sometimes more) than the
> interpreted .py version. The bad news is that it gives different
> results! In trying to track down where things go awry, I made the
> following declaration in each
>
> from sage.misc.decorators import sage_wrap
> from string import join
> def logged(func):
> @sage_wrap(func)
> def with_logging(*args, **kwds):
> print func.__name__ + '(' + join([str(_) for _ in args],',')
> + ')'
> return func(*args,**kwds)
> return with_logging
>
>
> I then put
> @logged
>
> in from of the defs of a bunch of functions.
>
> This works as expected with .py version, but when I try to compile
> the .pyx version I get the message:
>
> .... in update_wrapper
> setattr(wrapper, attr, getattr(wrapped, attr))
> AttributeError: attribute '__doc__' of 'builtin_function_or_method'
> objects not writable
>
> I think that I understand what's going on here, but are there any
You often can't use decorators with Cython code, since it is compiled
(not dynamic).
> suggestions as to how to get to the bottom of the differences between
> the cython compiled version and the interpreted version?
Put in print statements?
-- William
>
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--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org
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