Ractor test

rt.rb

#!/usr/bin/env ruby

require 'benchmark'
require 'etc'

def fib(n)
  return 1 if n <= 2
  k = n >> 1
  a = fib(k + 1)
  b = fib(k)
  n % 2 == 1 ? (a.abs2 + b.abs2) : (b * ((a << 1) - b))
end

N = 10_000_000

Benchmark.bm {
  _1.report('seq') {
    Etc.nprocessors.times { fib N }
  }

  _1.report('par') {
    Etc.nprocessors.times.map {
      Ractor.new { fib N }
    }.each &:take
  }
}

__END__
       user     system      total        real
seq  5.381498   0.003257   5.384755 (  5.394994)
par 23.197400   8.358632  31.556032 (  8.293363)