Mine

stack = Device.find_by_sql( "SELECT * from devices WHERE ip_address != ''" )

runner = PooledRunner.new(Dummy, stack.size, [], false)
while stack.size > 0 do
  runner.run() do |handler|
    puts "hello"
    puts "Walking #{handler.ip_address} #{handler.device_id}"
    handler.walk
    puts "Success: #{handler.ip_address} #{handler.device_id}"
    #puts "Handler #{handler.inspect}    total threads: #{runner.num_tasks}"
    sleep ( i.to_f / 20 )
    stack.pop
  end
end
runner.wait_for_all