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…

How to display Product name and Vendor name in Linux

This post will help you to find out the

  • Product Name
  • System Vendor Name 
This will help you to find the suitable device drivers if any.

The following is the command to find the System Vendor (in my case it is Hewlett Packard)
prompt $] cat /sys/class/dmi/id/sys_vendor

Here is the command to find the product name

prompt $] cat /sys/class/dmi/id/product_name


Printing the System Vendor and Product Name
cat is the command to concatenate the files and print it to the standard output

 T S Pradeep Kumar

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