benchmark:
  vm_thread_sized_queue4: |
    require 'thread'
    # many producers, many consumers
    nr = 1_000_000
    n = 10
    m = 10
    q = Thread::SizedQueue.new(100)
    consumers = n.times.map do
      Thread.new do
        while q.pop
          # consuming
        end
      end
    end

    producers = m.times.map do
      Thread.new do
        while nr > 0
          q.push true
          nr -= 1
        end
      end
    end

    producers.each(&:join)
    n.times { q.push nil }
    consumers.each(&:join)
loop_count: 1