Queuing Models in NS2

M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

Tracegraph - a graphing software to plot the trace files from NS2

Tracegraph is a third party software helps in plotting the graphs for NS2 and other networking simulation softwares. But the sad point is the software is not maintained by anyone and the happiest point is the software works fine still and it is free. 

You may download the tracegraph software from these locations.

For windows: https://dl.dropbox.com/u/24623828/tracegraph202.rar

For Linux : https://dl.dropbox.com/u/24623828/tracegraph202linux.tar.gz


There are actually two files one with the matlab runtime library file and other is the original software tracegraph.

Tracegraph when opened, it opens 3 windows, 

  • one window to select the trace file (.tr) that was created by NS2 (depending on the size of the trace file , the processing time also varies)
  • Second window is the main window in which you can see the graphs for various performance characteristics like throughput, End to End Delay, jitter, etc in 2D and 3D facillity. Even it can plot the histograms too.
  • Third window is nothing but the Simulation Information Windows, that you can see the packet loss, packet delivery, end to end delay for the total network, information about the intermediate nodes, source and destination nodes.

    Tracegraph exists for windows as well Linux, you can download both the versions at these locations

    For windows Installation : http://www.nsnam.com/2011/08/tracegraph-installation-in-windows-7.html

    For Linux Installation : http://www.nsnam.com/2011/08/tracegraph-installation-in-fedora-12.html

    the following is the snapshot for windows installation: Copy the PATH as done in the pic and paste it in the environmental variables



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