[Cython] About using Python's logging facility

[Robert Bradshaw]

On May 15, 2009, at 4:22 PM, Mohamed Lrhazi wrote:

> Hello,
>
> I did an "import logging" in my Cython code, then proceeded to replace
> all my "print" debugging statements with logger.debug(), and then some
> logger.info(), and then stopped to think...
>
> How bad is it for performance to include such frequent calls to a
> standard Python module? I don't understand how Cython works well
> enough, Please clarify.

It is the cost of a normal Python call (plus running the  
corresponding Python code), which may or may not matter relative to  
the other things you're doing. In other words, it'll cost about the  
same as it would doing it from Python (but you might notice more  
because the surrounding code is faster, so it has a higher relative  
cost). I certainly wouldn't put it in my inner loops, but a call to  
it now and then probably won't hurt.

Though not as flexible as the logging module, branching on a local  
int variable will be orders of magnitude faster.

- Robert