require 'benchmark'

def fib(n)
  n < 2 ? n : fib(n-1) + fib(n-2)
end

def test(thread_qty,fib_qty)
  puts "\n#{self.class.name}##{__method__} .. thread_qty: #{thread_qty}, fib_qty: #{fib_qty}"
  puts Benchmark.measure{
    count = 0
    arr = []

    thread_qty.times do |i|
      arr[i] = Thread.new {
	  # sleep(rand/qty)
	  fib(fib_qty)
	  Thread.current["mycount"] = count
	  count += 1
      }
    end

    arr.each {|t| t.join; print t["mycount"], ", " }
    puts "count = #{count}"
  }
  puts "\n"
end

test(4,1)
test(4,2)
test(4,4)
test(4,8)
test(4,16)
test(4,32)
test(4,48)
# test(4,64)