code: def start_timer(self, name):
          
          op_stat = self.get_op_statistic(name)
          op_stat.start_timer()
          return op_stat
docs: This method is called by pywbem to start the timer for a particular
          operation execution. It returns the corresponding
          :class:`~pywbem.OperationStatistic` object, creating one if needed.
  
          The timer is subsequently stopped by pywbem by calling the
          :meth:`~pywbem.OperationStatistic.stop_timer` method on the returned
          :class:`~pywbem.OperationStatistic` object.
  
          Parameters:
  
            name (string):
              Name of the operation.
  
          Returns:
  
            :class:`~pywbem.OperationStatistic`: The operation statistic for the
            specified name. If this statistics container is disabled, a dummy
            operation statistic object is returned.