Graphing the Metrics

After computing a network's metrics, the user can graph the time evolution of the network's metrics. The metrics are:

Average buffer occupancy in packets at time t for a link direction ( AvgSize(t) )

Utilization at time t for a link direction ( Util(t) )

Loss probability for a link direction ( LossProb(t) )

Achieved throughput for a traffic class ( Throughput(t) )

To Create a Graph

Recall that the evaluation procedure saves the time-evolution of the metrics in a dump file specified by the user. To create a graph of the time evolution of metrics, choose the Create Graphic command from the View menu. A graph creation dialog will appear.

Enter the file where the evaluator dumped the metrics (this would be the dump file chosen by the user when computing the metrics). Enter the metrics to be graphed, by first selecting the link metrics option or the traffic-class metrics option, and then selecting the queues / traffic classes and metrics. For the average buffer occupancy metric, the program can also plot the results obtained by running ns.