Re: [ns] Need help on flowmonitors

[Ratul Mahajan <ratul@aciri.org>]

Individual flows can be extracted using something similar to

foreach flow [$fmon flows] {
	set flow_pkts [$flow set parrivals_]
	.....

}

You can see ~ns/ns-2/tcl/rtmechanisms/rtm_reclass.tcl for examples.

> I tried to call the "fmon(0) dump" command during simulation, but this 
> generates some error messages.

Did you attach a channel (file pointer) to the flowmon object before
calling dump?

	-ratul

On Mon, 6 Nov 2000, Edmund Solberg [iso-8859-1] L�vlund wrote:

> How can I pick out measures for individual flows from a shared link with a 
> a flow monitor?
> 
> I have attached a flowmonitor "fmon(0)" to the link between "node0" and 
> "node1":
> 
> 	set fmon(0) [$ns makeflowmon Fid]
> 	$ns attach-fmon [$ns link $node0 $node1] $fmon(0) 0
> 	$fmon(0) attach $tracefile
> 
> Let's say the stoptime for the simulation is 5.0 seconds:
> Commands like "$ns at 6.0 fmon(0) dump" works OK. I also managed to get 
> measures like total numbers of bytes,
> packets (total number on the link, not from an individual flow) etc. during 
> the simulation by using commands like:
> 
> 	set tot_pkts [$fmon(0) set parrivals_]
> 
> What I really want to do is to collect measures like "number of packets 
> arrived" from just one of the flows at regular intervals during the
> simulation.
> 
> There must be some way to get data from individual flows during simulation, 
> but I haven't managed to figure it out by myself
> from the manual or the mailing list archives.
> 
> Hope someone can help me on this problem. Example scripts would be much 
> appreciated.
> 
> Regards
> Edmund
> 
> 
> 
>