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…

Joining MKV (Matroska) video files in Ubuntu

This post will tell you how to join mkv files through terminal mode in Ubuntu 12.04 Operating System.

Requirements:
mkvmerge command
Ubuntu 12.04 (64 bit)

Matroska is a video file codec that is useful to store compressed high quality video into a small file. the extension of matroska is mkv and if there are multiple mkv files, how those files can be combined in to single file (in short we call it merging). Here is the method to do it.

First you need to install the mkvmerge command in linux to do the merging
here is the command to install that
$]   sudo apt-get install mkvtoolnix-gui 
If there are four files like
one.mkv
two.mkv
three.mkv
four.mkv

and the output file for the same would be pradeep.mkv, then here is the command

$] mkvmerge -o pradeep.mkv  one.mkv +two.mkv +three.mkv +four.mkv 

You can refer the following image for the same.
mkvmerge
mkvmerge (To Merge many mkv files)
For any queries, the readers can reach the author through the commenting section.

+Nabin Pradhan

 T S Pradeep Kumar

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