Re: [ns] end to end delay

[Lloyd Wood <l.wood@eim.surrey.ac.uk>]

On Fri, 28 Jul 2000, Bilgin Metin wrote:

> To compute end-to-end delay you gave an awk code. It is a stupid stuation
> but I do not  know how to use this code.
> 
> Could you please show how to use your awk code with simple tcl example
> below:

You can't.

You're not doing trace-all, only namtrace-all.

You need to do awk -f out.tr on a tracefile generated from trace-all.

Please read the ns manual (apparently formerly notes and
documentation, but still located in a directory called 'doc')

L.

<L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>

> #######example ################
> 
> #Create a simulator object
> set ns [new Simulator]
> 
> #Open the nam trace file
> set nf [open out.nam w]
> $ns namtrace-all $nf
> 
> #Define a 'finish' procedure
> proc finish {} {
>         global ns nf
>         $ns flush-trace
> 	#Close the trace file
>         close $nf
> 	#Execute nam on the trace file
>         exec nam out.nam &
>         exit 0
> }
> 
> #Create two nodes
> set n0 [$ns node]
> set n1 [$ns node]
> 
> #Create a duplex link between the nodes
> $ns duplex-link $n0 $n1 1Mb 10ms DropTail
> 
> #Create a CBR agent and attach it to node n0
> set cbr0 [new Agent/CBR]
> $ns attach-agent $n0 $cbr0
> $cbr0 set packetSize_ 500
> $cbr0 set interval_ 0.005
> 
> #Create a Null agent (a traffic sink) and attach it to node n1
> set null0 [new Agent/Null]
> $ns attach-agent $n1 $null0
> 
> #Connect the traffic source with the traffic sink
> $ns connect $cbr0 $null0
> 
> #Schedule events for the CBR agent
> $ns at 0.5 "$cbr0 start"
> $ns at 4.5 "$cbr0 stop"
> #Call the finish procedure after 5 seconds of simulation time
> $ns at 5.0 "finish"
> 
> #Run the simulation
> $ns run