# IO.select performance. worst case of single fd. ios = [] nr = 1000000 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 / 2) - 10).times do ios.concat IO.pipe end last = [ ios[-1] ] puts "last IO: #{last[0].inspect}" nr.times do IO.select nil, last end