class Fiber
  def yield2
    Scheduler.enqueue self
    Scheduler.reschedule
  end
  def self.yield2
    Fiber.current.yield2
  end
end

require "benchmark"
N = 10_000_000

Benchmark.bm do |x|
  x.report("before") do
    spawn do
      N.times {|i| Fiber.yield }
    end

    N.times { Fiber.yield }
  end
  x.report("after") do
    spawn do
      N.times {|i| Fiber.yield2 }
    end

    N.times { Fiber.yield2 }
  end
end