Queuing Models in NS2

Image
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…

Graphics.h in Linux Mint or Ubuntu

This post tells you how to install graphics.h in either Ubuntu or Linux Mint

Parameters:
OS : Linux Mint 17.1 - 64 bit OS

Usually graphics.h will not be available in Linux Mint and if you want to include that in Ubuntu or Mint, here are the steps and a sample program

$ sudo apt-get update
$ sudo apt-get install build-essential autoconf automake libxmu-dev 
The above line is needed to get all the developmental libraries for ubuntu or mint. 

$ sudo apt-get install libsdl-image1.2 libsdl-image1.2-dev guile-1.8 guile-1.8-dev libsdl1.2debian libart-2.0-dev libaudiofile-dev libesd0-dev libdirectfb-dev libdirectfb-extra libfreetype6-dev libxext-dev x11proto-xext-dev libfreetype6 libaa1 libaa1-dev libslang2-dev libasound2 libasound2-dev

The above line is needed to download the complete graphics with sound libraries

Download this file libgraph
http://download.savannah.gnu.org/releases/libgraph/libgraph-1.0.2.tar.gz

Go the download location and unzip it
$ tar zxvf libgraph-1.0.2.tar.gz
$ cd libgraph-1.0.2/
$ ./configure
$ sudo make
$ sudo make install
$ sudo cp /usr/local/lib/libgraph.* /usr/lib

Once done, its ready to run the graphics.h file

Here are two examples, one to plot  stars in space

/*A program to draw a space with stars*/
#include <graphics.h>
int main()
{
  int gd=DETECT,gm;
  int i,x,y;
  initgraph(&gd,&gm,NULL);
  line(0,0,640,0);
  line(0,0,0,480);
  line(639,0,639,480);
  line(639,479,0,479);
  for(i=0;i<=1000;i++)
  {
    x=rand()%639;
    y=rand()%480;
    putpixel(x,y,15);
  }
getch();
  closegraph();
}
/* End of program */
Here is the output
graphics.h
Graphics Program for Stars



Program 2: A Program to plot a Bar Graph (Histogram)
/*Here a sample program to illustrate how to use BARS which are used for visual statistics */
#include <graphics.h>
int main() {
  int gd=DETECT,gm,maxx,maxy,x,y,button;
  initgraph(&gd,&gm,"");
  line(80,150,200,150);
  line(80,150,80,50);  

outtextxy(100,153,"<-X axis");
  outtextxy(60,50,"<-Y axis");
  bar(100,100,120,150);
  bar(130,120,150,150);
  getch();
  closegraph();
}

Here is the output
graphics.h
Graphics.h for Bar Chart
 T S Pradeep Kumar

Popular posts from this blog

AWK Scripts for NS2 to process data from Trace Files

Xgraph

ns2 installation in Ubuntu 14.04