Re: [Q] Error on FTP flow

[yangh <yangh@scf-fs.usc.edu>]

Hi,
> 
> Now, it should work. The bad new is that the bytes_ variable inside
> traceapp is not recording anything, at least in the examples I have
> tested... 
> 
> Any idea? (I hope any NS guru is reading this ;-)
> 
>
> /FCD
> 
> ----------------------------------------------------------------------
> Fernando Cela
> email: fcela@ce.chalmers.se                     phone: +46 31 772 1709
> 
I tried that code before. It DID record something. I believe that codes
work.

Best Regards

Yang
> On Thu, 29 Jul 1999, HoKun Chung wrote:
> 
> > Dear sir.
> > 
> > I am a graduate student in korea. 
> > I want  to get the sender/receiver's throughtput for the FTP application 
> > over TCP agent, without trace file.
> > 
> > Luckily, I found the source.
> > http://www-mash.cs.berkeley.edu/dist/archive/ns-users/9904/0200.html
> > http://www-mash.cs.berkeley.edu/dist/archive/ns-users/9904/0116.html
> >  
> > but, I have a some problem. It occurs error. error message is 
> > 
> >     can't read "traceapp" : no such variable 
> >     while executing "$ns at 0.1 "$traceapp start"
> > 
> > I can't solve this problem... Please, help me..
> > 
> > It is partical code for getting the throuthput of FTP.
> > -----------------------------------------------------------------------------------------------------
> > ......
> > set n0 [$ns node]
> > set n1 [$ns node]
> > ......
> > set tcp0 [new Agent/TCP]
> > $ns attach-agent $n0 $tcp0
> > 
> > Class TraceApp  -superclass Application    # subclass created....
> > 
> > TraceApp instproc init {args} {
> >  $self set bytes_ 0
> >  eval $self next $args
> > }
> > 
> > TraceApp instproc recv {byte} {
> >  $self instvar bytes_
> >  set bytes_ [expr $bytes_ + $byte]
> >  return $bytes_
> > }
> > 
> > set sink1 [new Agent/TCPSink]
> > TraceApp traceapp
> > traceapp attach-agent $sink1
> > $ns attach-agent $n1 $sink1
> > 
> > set ftp0 [new Application/FTP]  
> > $ftp0 attach-agent $tcp0
> > 
> > $ns connect $tcp0 $sink1
> > 
> > $ns at 0.1 "$traceapp start"                # error occurs .... ------------------
> > $ns at 0.2 "$ftp0 start"
> > $ns at 1.0 "$ftp0 stop"
> > #puts "Traffic volumn = [$traceapp set bytes_]"
> > $ns at 1.1 "finish"
> > ...
> > 
> > Please, Help me....
> > 
> 
> 
> 
>