Re: Callback function instead of trace-file?

[kfall@ee.lbl.gov]

>
> From:  "Christoph Haenle" <christoph@starburstcom.com>
> To:    <ns-users@mash.cs.berkeley.edu>
> Subject: Callback function instead of trace-file?
> Date:  Wed, 06 Aug 1997 18:55:05 PDT
>
> Hi everybody,
> 
> I'm using ns-2b18 and need a possibility to see what happens to certain
> packets inside the network. I thus need to monitor the links. However, my
> simulation has a large number of links and my logfiles become soon very
> large (ca 10MB/min) if I log everything. In order to run simulations
> overnight, I don't want all traces to be written to disk. Rather, I'm
> looking for some possibility to register a callback-function that is called
> whenever a packet is enqueued, dequeued or lost on a link. If I remember
> right, this functionality was implemented in ns-1.4, but I can't find it in
> ns-2.
> If nothing else helps, I could open a named pipe with Tcl, have ns write
> everything to the pipe and read & parse everything that arrives on the
> other end. But that would pretty much be a hack. Moreover, I would need
> multithreading support (for running ns and the evaluation of the traces
> simultaneously).
> 
>      Any suggestions?
> 
>        TX,
> 
>          -Chris.

Can you describe a bit more of your application?  Do you need to
take some action other than statistic gathering when packets
{arrive/depart/are dropped}?

- K