简单的说，RRDtool1.4.3 (Round Robin Database Tool)就是一个强大的绘图的引擎，很多工具例如MRTG都可以调用rrdtool绘图。 -Simply put, RRDtool1.4.3 (Round Robin Database Tool) is a powerful graphics engine, and many tools such as MRTG can call rrdtool drawing.

performs round robin operation