benchmark/io_select3.yml


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prelude: |
  # IO.select performance. a lot of fd
benchmark:
  io_select3: |

    ios = []
    nr = 100
    if defined?(Process::RLIMIT_NOFILE)
      max = Process.getrlimit(Process::RLIMIT_NOFILE)[0]
    else
      max = 64
    end
    puts "max fd: #{max} (results not apparent with <= 1024 max fd)"

    (max - 10).times do
      r, w = IO.pipe
      r.close
      ios.push w
    end

    nr.times do
      IO.select nil, ios
    end
loop_count: 1