[ns] How should i use Traffic Trace ?

[Andrea Josi <mr_josi@yahoo.it>]

Hi,

i am getting segfault when i try to use
Application/Traffic/Trace objects:
i get the same error either when i run tcl/ex/tg.tcl
or when i try to use Lee Breslau's Star Wars trace
file; the following lines are dumped:

 warning: no class variable Tracefile::debug_

        see tcl-object.tcl in tclcl for info about
this warning.

could not stat starwars.nsformat
ns: finish:
    (_o3 cmd line 1)
    invoked from within
"_o3 cmd flush trace"
    invoked from within
"catch "$self cmd $args" ret"
    (procedure "_o3" line 2)
    (SplitObject unknown line 2)
    invoked from within
"$ns flush trace"
    (procedure "finish" line 4)
    invoked from within
"finish"   

(i am running ns-2.1b8 under linux red-hat)

I'd be quite grateful if you could give me a hand

Thanks a lot ;-)



Here is my script:

set ns [new Simulator]

set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]
set n4 [$ns node]
set n5 [$ns node]

set f [open aj/star.tr w]
$ns trace-all $f
set nf [open aj/star.nam w]
$ns namtrace-all $nf

$ns duplex-link $n0 $n1 1.5Mb 10ms DropTail
$ns duplex-link $n0 $n2 10Mb 5ms DropTail
$ns duplex-link $n0 $n3 10Mb 5ms DropTail
$ns duplex-link $n0 $n4 10Mb 5ms DropTail
$ns duplex-link $n0 $n5 10Mb 5ms DropTail


set tfile [new Tracefile]
$tfile filename starwars.nsformat

set s4 [new Agent/UDP]
$ns attach-agent $n4 $s4

set null1 [new Agent/Null]
$ns attach-agent $n1 $null1

$ns connect $s4 $null1

set trace [new Application/Traffic/Trace]
$trace attach-tracefile $tfile

$trace attach-agent $s4

$ns at 1.0 "$trace start"

$ns at 10.0 "$trace stop"

$ns at 12.0 "finish"

proc finish {} {
    
        global ns nf f
	$ns flush trace
        close $f
        close $nf
	exec nam aj/provatrace.nam &
        exit 0
	
}

$ns run




______________________________________________________________________
Do You Yahoo!?
Il tuo indirizzo gratis e per sempre @yahoo.it su http://mail.yahoo.it