[LRUG] Recursion diversion

[Peter Vandenabeele]

On Sat, Oct 26, 2013 at 9:40 AM, David Nolan <dave at textgoeshere.org.uk>wrote:

> With a bit of memoization, this one runs pretty fast (2+ times faster than
> the next fastest on haystacks > 100 chars and needles > 4 chars, and
> increasingly much better as the strings get larger):
> https://gist.github.com/knaveofdiamonds/7155189#comment-936910
>
> As an aside, the fruity gem is excellent for benchmarking. This explains
> why: https://github.com/marcandre/fruity#approach.
>

Interesting concept indeed.

Also the naive Rspec timing test confirms "dave_spec.rb" to be faster than
all other contenders
and fairly memory efficient. I presume the naive Rspec timing test is
losing relevance, compared
to more serious Benchmarking tools.

roland_spec.rb  =>   9.14 s  11 loc (1035 MB max RSIZE)
michael_spec.rb =>   8.82 s  13 loc (1044 MB max RSIZE)
peter_spec.rb   =>   5.91 s  30 loc ( 244 MB max RSIZE)
tom_spec.rb     =>  20.05 s   9 loc ( 326 MB max RSIZE)
dominic_spec.rb => 395.   s  14 loc ( 434 MB max RSIZE)
jason_spec.rb   =>  16.21 s  19 loc ( 535 MB max RSIZE)
peter2_spec.rb  =>   5.24 s  42 loc ( 222 MB max RSIZE)
dave_spec.rb    =>   4.82 s  19 loc ( 323 MB max RSIZE)

(ref https://gist.github.com/petervandenabeele/7161464 )

Fun !

Peter
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