Royal Flushes

royalflush.rb

#!/usr/bin/env ruby

royal_flushes = [
  [1,10,11,12,13],
  [14,23,24,25,26],
  [27,36,37,38,39],
  [40,49,50,51,52]]


iterations = 50_000_000
matches = 0
  
deck = (1..52).to_a
iterations.times do
  matches += 1 if royal_flushes.include?(deck.sample(5).sort)
end

puts "#{matches}/#{iterations}"

royalflush2.rb

#!/usr/bin/env ruby

require 'thread'

royal_flushes = [
  [1,10,11,12,13],
  [14,23,24,25,26],
  [27,36,37,38,39],
  [40,49,50,51,52]]

iterations = 50_000_000
matches = 0
thread_count = 3
iterations_per_thread = iterations/thread_count

semaphore = Mutex.new
threads = ThreadGroup.new

1.upto(thread_count) do
  thread = Thread.new do
    deck = (1..52).to_a
    iterations_per_thread.times do
      semaphore.synchronize { matches += 1 } if royal_flushes.include?(deck.sample(5).sort)
    end
  end
  threads.add thread
end

until threads.list.empty? do
  sleep 0.1
end
  
puts "#{matches}/#{iterations}"

run

chris@ubuntu64:~/2231141$ ruby --1.9 -v
jruby 1.6.7 (ruby-1.9.2-p312) (2012-02-22 3e82bc8) (OpenJDK 64-Bit Server VM 1.7.0_147-icedtea) [linux-amd64-java]
chris@ubuntu64:~/2231141$ time ruby --1.9 royalflush.rb ; time ruby --1.9 royalflush2.rb 
37/30000000

real  0m42.600s
user  0m43.543s
sys 0m1.928s
41/30000000

real  0m29.667s
user  0m57.580s
sys 0m1.620s
chris@ubuntu64:~/2231141$