Optimization fun

[Dmitry Olshansky via Digitalmars-d]

08-Nov-2014 03:22, Walter Bright пишет:
> On 11/7/2014 2:58 PM, Dmitry Olshansky wrote:
>> That's the problem with profilers:
>>      they say what takes time but not why :)
>>
>> Often I find myself looking at memcpy at the top of the list, so
>> obvious the
>> "textbook" answer is to optimize memcpy ;) In contrast it should be
>> read as "you
>> seem to do excessive copying of data".
>
> dmd's profiler will give you a tree showing who called each function how
> many times. This helps a lot with the "why" question.
>

This information is very limited esp in case of recursive functions, 
it's still more of what instead of why. "Why" always takes a bit of 
research.

Also I'd suggest to use many different profilers.

-- 
Dmitry Olshansky