[Cython] compiler performance issue for extended utility code

mark florisson markflorisson88 at gmail.com
Sun Oct 16 20:58:40 CEST 2011

On 16 October 2011 19:51, mark florisson <markflorisson88 at gmail.com> wrote:
> Tempita uses re.sub to do the parsing. Most utilities are loaded at
> module-level, so perhaps we should use lazy loading like Vitja
> suggested. Are the cythonscope utilities loaded?
> On 16 October 2011 19:46, Stefan Behnel <stefan_ml at behnel.de> wrote:
>> mark florisson, 08.10.2011 15:18:
>>> On 8 October 2011 13:10, Vitja Makarov wrote:
>>>> I've also noticed that some utilities are loaded unconditionally
>>>> perhaps it's better to introduce lazy loading.
>>> Well, they shouldn't be. If they are it's generally a bug. I noticed
>>> that it happens in the test runner though, although it should create a
>>> fresh context with freshly initialized entries.
>> I recently ran only the couple of with-statement related tests through
>> cProfile and it told me that it had spent something like 20 seconds in
>> "builtin method sub()", i.e. doing completely useless string processing,
>> followed by some 3 seconds or so for the rest of the compilation and test
>> execution. That doesn't sound right.
>> Stefan
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Sorry for the previous accidental top-post.

Most of these problems will go away if we get a libcython module and a
cython.h header. In the meantime we could do the lazy stuff, it
shouldn't be hard to implement. Maybe load it when any of the
attributes get accessed and just wrap it.

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