Entirely Unscientific Benchmark of Primes in Various Ruby Implementations

bench.md

Unscientific Benchmark

The Benchmark

def is_prime? n
  (2...n).all? { |i| n % i != 0 }
end

def sexy_primes n
  (9..n).map do |i|
    [i - 6, i]
  end.select do |i|
    i.all? { |i| is_prime? i }
  end
end

a = Time.now
sexy_primes 100_000
b = Time.now

puts b - a

The Results

Topaz-dev

7.78 sec

Ruby-1.9.3-p392

45.38 sec

Ruby-2.0.0-p0

44.82 sec

JRuby-1.7.3

41.97 sec

Rbx-2.0.0-rc1

85.51 sec

Maglev-1.1.0-dev

23.97 sec

MacRuby-0.1.3

35.37 sec

MRuby-dev

262.25 sec (not compiled or performance optimized, just here for fun)

IronRuby-1.1.4 on Mono-2.10.10

429.36 sec

Copyright Shannon Skipper MIT or Ruby License

Can I add this script to MRI benchmark directory? (license?)

Crystal

2.274 sec

https://github.com/manastech/crystal

@ko1 Sorry for such a late reply, I just now saw your comment! Yes, please use the script for anything you'd like with any license you'd prefer!

@asterite Wow, cool! I need to take a closer look at crystal for sure.

@havenwood Thanks :-)

Just a small warning: Crystal is not a Ruby compiler. It's a different language (that happens to have almost the same syntax). And it's more limited than Ruby. And it's still in it's early development stage. And we don't know if it will work.

Topaz looks really good too. It's amazing that it's so fast.