ruby-concurrency/concurrent-ruby

#!/usr/bin/env ruby

#$: << File.expand_path('../../lib', __FILE__)

require 'concurrent/atomics'
require 'benchmark'
require 'rbconfig'

THREADS = 1
TESTS = 10_000_000

def atomic_test(clazz, opts = {})
  threads = opts.fetch(:threads, 5)
  tests = opts.fetch(:tests, 100)

  num = clazz.new
  latch = Concurrent::CountDownLatch.new(threads)

  print "Testing with #{clazz}...\n"
  Benchmark.bmbm do |bm|
    bm.report do
      threads.times do |i|
        Thread.new do
          tests.times{ num.up }
          latch.count_down
        end
      end
      latch.wait
    end
  end
end

puts "Testing with #{RbConfig::CONFIG['ruby_install_name']} #{RUBY_VERSION}"

atomic_test(Concurrent::MutexAtomicFixnum, threads: THREADS, tests: TESTS)

if defined? Concurrent::CAtomicFixnum
  atomic_test(Concurrent::CAtomicFixnum, threads: THREADS, tests: TESTS)
elsif RUBY_PLATFORM == 'java'
  atomic_test(Concurrent::JavaAtomicFixnum, threads: THREADS, tests: TESTS)
end