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…

Simple Screen Recorder for Linux

Recording the screen in Linux OS is always a tedious task, as either the video/audio malfunctions or support may not be there. There is a tools called simple screen recorder for Linux.
Its a very simple tool that is recorded and processed in no time. For example, if you record an 1 hour video, the processing may take another 20 to 50 minutes. But this software does the “On the fly recording and processing”
This software has a straight forward interface and its incomparable to other softwares in the market.
  • Its faster than VLC
  • It never takes more amount of RAM like VLC do.
  • Its multithreaded, if you have more than one core, then the processing happens at all the cores.
  • it can do live streaming also, but it is under experimental setting.
  • it supports many different codecs.
Here is the simple screenshot.
Simple Screen Recorder
Simple Screen Recorder

Simple Screen Recorder
Simple Screen Recorder

Simple Screen Recorder
Simple Screen Recorder

Simple Screen Recorder
Simple Screen Recorder

A 42 minute video is recorded using this software and it takes just 42minute only. no extra time for processing. Please see the youtube video attached below.
See the above video taken using SSR and its about SSR. To download this software follow this URL
For any doubts, just ping me through the comment form
T S Pradeep Kumar

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