Re: Effective throughput

[Ingela Anderton <ingela@docs.uu.se>]

Christoph Haenle wrote:
> Ingela:
> 
> > trace file? I also thought maybe I can use a flow monitor somehow but I
> > don't feel confident that parrivals and barrivals variables contain
> > the effective throughput, maybe they contain the total throughput? I
> > don't think the documentation is clear on this point so if someone
> > would like to clarify it that would be great.  
> 
> parrivals_ and barrivals_ count the number of packets and bytes, respectively, 
> that get routed to the link that is being monitored. To calculate the mean 
> throughput of a link in bytes/s since the start of the simulation, you have to 
> devide bdepartures_ by [$ns now]. bdepartures_ is generally smaller than 
> barrivals_ because packets can cause the buffer of the router associated with 
> the link to overflow (in which case barrivals_ is incremented, but not 
> bdepartures_)

Thank you for the answer it has been helpful, but I have another
question. How can I get the mean throughput for diffrent flows over
the same link?

-- 
/m.v.h. Ingela

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