Re: Need some suggestions about Ns simulator

[Subramaniam Vincent <svincent@ISI.EDU>]

>                     -----
>        Source 1 -----   |
>                         |
>        Source 2 -----   |----------------------- Sink
>                         |
>        Source 3 -----   |
>                    -----|
>
>                   (FIFO queue)
>
>         I just want to collect some statistics such as Packet arrivals and
>         Buffer lenght.  Unfortunately, I don't know how to start modifying
>         this simulator for my purpose. I know that you are very busy and
>         have a lot of thing to do but could you give me some suggestion
>         about what file I should concern and modify them for my objective.
>         And I have to create my own Tcl file or not. Your suggestions is
>         very much profitable for me.


Dhanant,

The QueueMonitor object collects some statistics. You can do the
following.

a. Use the $ns monitor-queue <link tracefile etc> command to start
monitoring
your link. This installs a QueueMonitor and attaches the tracefile for
you.

b. Use the start-tracing function in ns-link.tcl to get the
quemon to log stats into the tracefile. (look at the printstats function
in queue-monitor.cc to see if you find these useful.

do look at the example files in tcl/ex, and the files in tcl/lib.

vince