Queuing Models in NS2

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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…

NS2 Visual trace analyzer

A Visual trace analyzer is been developed by Mr. Fernando and you can download freely from his website http://nsvisualtraceanalyzer.wordpress.com/ This software is been developed using
  • .NET C# 4.0
  • This software will run only in windows and not tested in Wine platform of Linux (May be will work)
This software accepts a tcl, trace files, scenario files and interprets the contents and displays results like throughput,data, etc.
Also there is a provision for graphing too.. Its a very great handy tool for NS2 (particularly beginners to researchers)..
Here are some of the screen shots of the software
Open a Tcl File and shows the second picture as shown in the next picture.
 In the following pic, the tcp packet flow is selected and a window pops out with various results.
Iin the following picture, the right side of the window is not used and the cross X indicates it is not used now, may be in future that area will be used.
And this picture tells you the throughput of a gives network.


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