benchmarking with jruby

gistfile1.rb

include java

def benchmark(warmups, loops, &block)
  (0...warmups).map do
    start_time = java.lang.System.currentTimeMillis
    (0...loops).each { yield }
    time = java.lang.System.currentTimeMillis - start_time
    $stdout.write("#{time},")
    time
  end
end

benchmark(20, 1000) { do_something_that_hurts }