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Re: [ns] How to monitor flow?
> I tried to monitor some flow states but failed. I have
> read ns document carefully and searched old archive.
> After spending two days reading some samples, such as
> test-suite-red.tcl, many_tcp.tcl and
> test-suite-cbq.tcl, I failed.
There are some useful examples in ~ns/tcl/rtmechanisms.
> What I want to do is to monitor each flow's packets
> been dropped and number of packets been queued. I do,
> however, get some flow statistics.
Modigyi your flowdump procedure as follows.
proc flowdump {interval} {
global ns fmon fstate
$fmon dump
flush $fstate
foreach f [$fmon flows] {
> set flow_arrs [$f set barrivals_]
> set flow_deps [$f set bdepartures_]
> set flow_drops [$f set bdrops_]
$f reset
}
$fmon reset
$ns at [expr [$ns now] + $interval] "flowdump $interval"
}
The number of queued packets for each flow are
(arrivals - departures - drops) in this interval +
queued packets in the last interval (zero to begin with).
- ratul
> But I don't know
> how to process the data. I guess I have to write some
> awk code to parse the trace data first, then to write
> some perl script to translate it to xgraph format, to
> use xgraph to display it finally. Due to my poor
> knowledge in linux/unix, I knew little about awk,
> perl, tcl (I am a windows user but have to use ns
> under linux for some reason).
>
> I attached the tcl script I used. Any of your
> suggestion, comments are highly appreciated.
>
> Thanks in advance.
>
> Canhui
>
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