File: bm_io_select3.rb

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# IO.select performance. a lot of fd

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