[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Create a graphical representation of link utilization
Hi Pedro!
I think that obtaining a specific tracing in ns is quite obscure and hard.
Ns-man is not up to date and Notes&Documentation is not really clear about
this. If you want you could use trace-queue at your end-link: this will
give you a trace file with all the link events (trace-queue traces links
more than queues); an 'r' event means that the packet has been received at
the end-node of that link, viz. at your destination node.
source node -> ni ->.......-> nj -----------------> destination node
^^^trace this link
But if you want something like bandwidth, a good solution is to use a ad
hoc procedure and xgraph, such as 'record' in Greis'Tutorial example
(what's your problem with it?). In alternative I use awk and matlab to post
process the trace files to obtain several data.
Max
Pedro Nuno M Matias wrote:
> Hello,
>
> I would appreciate some help on this particular issue.
>
> I need to draw a graphic that represents the bandwidth carried by a
> particular link in a network topology, but i don't know how to do it.
>
> I saw an example in Mark Greis' Tutorial that represents the bandwidth
> that arrive to a sink, and tried to do something similar to it, but fail
>
> to do it.
>
> I tried also to use a trace based on the following code:
>
> set la [open link2M.tr w]
> $ns create-trace Recv $la $n1 $n2
>
> This doesn't work. The file link2M.tr is created, but is empty.
>
> I searched for similar problems in the list archives, and i find that
> Massimo Pegorer reported a similar problem in May 7th. But I think that
> using trace-queue, like refered by Haobo Yu, does not solve my problem,
> because I'm interested in the traffic that is received at the
> destination node of a particular link (Recv) and not in questions
> refering to queue issues.
>
> Thank you in advance for your help.
>
> Pedro Matias.
>
> e-mail: <[email protected]>
>
> Laboratorio de Comunicacao e Telematica
> Departamento de Engenharia Informatica
> Universidade de Coimbra
> Vila Franca - Pinhal de Marrocos
> 3030 COIMBRA
> PORTUGAL
>
> Tel: +351-39-790000
> Fax: +351-39-701266
--
Massimo Pegorer, student
Dipartimento di Elettronica e Informatica
Universita' degli Studi di Padova
Padova - ITALIA