On May 15, 2009, at 6:31 PM, Mohamed Lrhazi wrote:
> Thanks a lot Robert.... The bad thing is that logger.debug() would
> still incure the costs you mention, even though it would be igonered
> by the logger in production time....
> I guess I should be using DEF and IF to only compile those calls at
> dev time....
You could do
cdef int verbosity = 0
cdef inline void log(char* msg, int level):
if level >= verbosity:
logger.log(level, msg)
Which would be extremely fast (nanoseconds) when turned off and could
be turned on/adjusted at runtime. Of course DEF and IF statements
would work as well.
- Robert
>
> On Fri, May 15, 2009 at 8:21 PM, Robert Bradshaw
> <[email protected]> wrote:
>> 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
>>
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>
>
>
> --
> " Logic merely sanctions the conquests of the intuition."
> Jacques Hadamard
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