Testing GIL throughput on CRuby

thread_peg.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

# Ruby GIL test
# Ideally this should saturate two cores.

a = []
b = []

t1 = Thread.new do
  received = 0
  loop do
    break if received > 500_000_000

    b.push(received)
    unless a.pop.nil?
      received += 1
      puts "a received #{received} messages" if (received % 25_000_000).zero?
    end
  end
end

t2 = Thread.new do
  received = 0
  loop do
    break if received > 500_000_000

    a.push(received)
    unless b.pop.nil?
      received += 1
      puts "b received #{received} messages" if (received % 25_000_000).zero?
    end
  end
end

t1.join
t2.join