Quick-n-dirty Ruby popen3 ssh benchmark

popen3_ssh.rb

  bytes_read = 0
  cmd = "ssh -i #{key_file} #{user}@#{ip} 'base64 /dev/urandom'"
  Open3.popen3(cmd) do |i, o, e, t|  # (in, out, error, monitor thread)
    begin
      Timeout.timeout(120) do
        while readables = IO.select([o, e])[0]
          readables.each{|r|
            if r == o
              dump = ""
              begin
                o.read_nonblock(4096, dump)
              rescue IO::WaitReadable
              ensure
                bytes_read += dump.length
              end
            end
            if r == e
              dump = ""
              begin
                e.read_nonblock(4096, dump)
              rescue IO::WaitReadable
              ensure
                puts(dump)
              end
            end
          }
        end
        Process.wait t.pid
      end
    rescue Timeout::Error => ex
      Process.kill 9, t.pid
    end
  end
  puts "run_ssh: " + bytes_read.to_s