Re: [ns] multiple flows

[Felix Hernandez Campos <fhernand@cs.unc.edu>]

Apu Kapadia wrote:

> Hi, I am already doing that. However, when I try to work on 201 flows for
> example, it throws an exception at flow 199.
>
> Regards,
> Apu
>
> > I don't think you cannot access a flow monitor object using list operators
> > such as lindex. You need to obtain a list of flows first with:
> >
> > set flowlist [$flowmon flows]
> >
> > and then you will be able to work with the list in the way you wanted:
> >
> > set flowmon_id [lindex $flowlist $i]
> > puts $dropfile "[$flowmon_id set pdrops_]
> >
> > -- Felix Hernandez
> >

Are your stats per flow correct now?

The exception sounds like an overflow. Check flowmon.cc, where you will find
this code:

char*
FlowMon::flow_list()
{
    ...
    fprintf(stderr, "FlowMon:: flow list exceeded working buffer\n");
    fprintf(stderr, "\t  recompile ns with larger FlowMon::wrk_[] array\n");
    ...
}

and also

char    wrk_[2048];     // big enough to hold flow list

You can try to increase the buffer size.

-- Felix Hernandez