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…

APP Tool for analysing the tracefiles for NS2

There is a new tool that is developed by WING of NIT Surathkal. This tool analyze most of the aspects like
  • throughput 
  • goodput
  • residual energy of a node
  • delay
  • packet delivery ratio
  • etc
and also plot graphs based on the python-matplotlib package

Download this tool from github https://github.com/WiNG-NITK/APP-Tool/archive/master.zip

Unzip it and give the following commands one by one

$prompt] sudo apt-get udpate
$prompt] sudo apt-get install python-matplotlib
$prompt] cd APP-Tool-master/
$prompt] python GUI_Main.py

Here are some of the screenshots
To open the App-tool-master
 The following is to plot the throughput
 This is for the throughput values to be plotted
 The following for plotting the delay
The source codes with awk files are given inside the folder Final/. if anyone needs the awk for processing without this front end, you can use that too.
To run awk files

$prompt] awk -f Avg_Del.awk /full/path/to/your/tracefile.tr
$prompt] gawk -f Avg_Del.awk /full/path/to/your/tracefile.tr

This will print the average delay (See the following screenshot)

awk code for throughput and delay

 T S Pradeep Kumar

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