Re: Judy code use of macros

[yjudy <yj...@cl...>]

Hi Alan!

Nobody I think misunderstood what Doug wrote and we're
all happy to use Judy everyday ;-)

Thanks for this amazing piece of code guys.

cheers
Younès



Alan Silverstein a écrit :
> Gang, I'm glad to see Doug still working on the Judy library, and
> responding to emails here.  But, he wrote:
>
>   
>> I have to agree with you about the readability of Judy.  Alan did his
>> best to obscure the code -- perhaps unintentionally.
>>     
>
> For the record:  I took a lot of highly redundant code, thousands of
> lines, and over time, with Doug's (grudging) approval and continued
> interaction, cleaned it up and ensured it was well formatted and
> documented.  The conscientious use of macros was to replace large
> sections of code, typically eight repetitions with dozens of lines in
> each instance and only minor differences, that were also mind-numbing to
> comprehend in their own way.  We agreed that for performance the code
> had to be "maximally unrolled", the question was how to do that while
> also making it elegant (and portable, and reliable).
>
> As I've written before, if we had but known (and had them available on
> HPUX), we should have used in-line functions.  The macros themselves are
> not attractive due to the backslashes and other constraints, but should
> not be so difficult to understand if you just think of them as inline
> functions, and are not so difficult to debug through if you (as we did)
> use the makefile to expand them for debuggable code.  I'm glad Doug has
> now determined that function call overhead is so low there's no reason
> not to modularize code into functions (inlined or not).
>
> Doug saying that I "did my best to obscure the code" is at best a gross
> distortion.  Without my involvement, HP would never have funded the Judy
> project in the first place.  Doug and I worked long and hard together
> for more than two years, along with several others who joined the
> project.  It was a productive collaboration of great diversity.  For
> example, where Doug had a ruthless focus on performance, I worked hard
> on concepts, terminology, documentation, infrastructure, build, test,
> and presentation issues so that together we could articulate a quality
> product.  We wrestled with innumerable data structure and algorithm
> conundrums to create Judy IV as we learned and re-learned the best way
> to solve a myriad of problems.
>
> Cheers,
> Alan Silverstein
>
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