code: def get_cpu_usage(self, cpu_id=0):
          
  
          cpu_usage = yield from self._hypervisor.send('vm cpu_usage "{name}" {cpu_id}'.format(name=self._name, cpu_id=cpu_id))
          return int(cpu_usage[0])
docs: Shows cpu usage in seconds, "cpu_id" is ignored.
  
          :returns: cpu usage in seconds