public void sendMessage(Message message) {
			try {
				m_sender.send(message);
			} catch (CommunicationException e) {
				LOGGER.error("{}. This error is not critical if it doesn't occur much.", e.getMessage());
			}
		}
Get current System performance.

@return {@link SystemDataModel} instance
ngrinder-core/src/main/java/net/grinder/AgentController.java