Re: [ns] Re: your mail

[tarik <tarik@usc.edu>]

Now the error is,

ns: dump _o15 1: invalid command name "1-0"
    while executing
"expr $delay+1"
    (procedure "dump" line 11)
    invoked from within
"dump _o15 1"


On Thu, 15 Jun 2000, Haobo Yu wrote:

> you should use 'set jitter ...'
> 
> On Thu, 15 Jun 2000, tarik wrote:
> 
> > Date: Thu, 15 Jun 2000 10:03:55 -0700 (PDT)
> > From: tarik <tarik@usc.edu>
> > To: ns-users@mash.CS.Berkeley.EDU
> > 
> > Hi
> >  I am trying to measure jitter between the two node but it gives me
> > following error
> > ns: dump _o15 1: can't read "jitter": no such variable
> >     while executing
> > "set $jitter [[expr $delay+1]-$delay]"
> >     (procedure "dump" line 11)
> >     invoked from within
> > "dump _o15 1"
> > 
> > My script is
> > 
> > #set ns [new Simulator]
> > set n0 [$ns node]
> > set n1 [$ns node]
> > $ns duplex-link $n0 $n1 5Mb 2ms DropTail
> > ## Set up BSD Tahoe TCP connection in opposite directions.
> > set src1 [$ns create-connection TCP $n0 TCPSink $n1 1]
> > set src2 [$ns create-connection TCP $n1 TCPSink $n0 2]
> > # Create ftp sources at the each node
> > set ftp1 [$src1 attach-app FTP]
> > set ftp2 [$src2 attach-app FTP]
> > # Start up the first ftp at the time 0 and
> > # the second ftp staggered 1 second later
> > #$ns at 0.0 "$ftp1 start"
> > $ns at 1.0 "$ftp2 start"
> > ## Create a trace and arrange for all link
> > # events to be dumped to "out.tr"
> > #set tf [open out.tr w]
> > $ns trace-queue $n0 $n1 $tf
> > set qmon [$ns monitor-queue $n0 $n1 ""]
> > set integ [$qmon get-bytes-integrator]
> > ## Dump the queueing delay on the n0->n1 link
> > # to stdout every second of simulation time.
> > #proc dump { link interval } {
> > 	global ns integ
> > 	#global ns temp
> > 	$ns at [expr [$ns now] + $interval] "dump $link $interval"
> > 	set delay [expr 8*[$integ set sum_] / [[$link link] set
> > bandwidth_]]
> > 	#set $temp delay
> > 	set $jitter [[expr $delay+1]-$delay]
> > puts "[$ns now] jitter=$jitter"
> > }
> > $ns at 0.0 "dump [$ns link $n0 $n1] 1"
> > ## run the simulation for 20 simulated seconds
> > #$ns at 15.0 "$ns halt; exit 0"
> > $ns run
> > 
> > Would you please what is  wrong here?
> > 
> > Thank!
> > 
> > KAt
> > 
> > 
>