[ndnSIM] How to trace the latency of request, duration from sending the Interest to receiving corresponding Data

[Xiaoke Jiang]

Thank you Alex.
I think Interest-Data latency also works for me. But request latency (including retransmission delays) is better than Interest-Data latency. So I will try with I-D latency first and wait for you update.

P.S, if the Interest don't get it's data or get an Nack, how do you define its latency in the program?

thanks

My Regards,
Xiaoke Jiang （蒋小可）

Ph.D Candidate,
Dept. of Computer Science and Technology,
Tsinghua University, P. R. China

On Jan 17, 2013, at 4:13 AM, Alexander Afanasyev <alexander.afanasyev at ucla.edu> wrote:

> Hi Xiaoke,
> 
> It is up to the particular application to track down Interest-Data latency.  There is another question regarding in which latency you're interested: just Interest-Data or first Interest for sequence number and reception of Data (which includes all the retransmission delays).
> 
> Currently in ndn::Consumer-based apps, there is tracking of just Interest-Data packets (i.e., without retransmission delays) within RTT estimator variable (Ptr<RttEstimator> m_rtt) and in timeout container (SeqTimeoutsContainer m_seqTimeouts).   
> 
> If you want/need the other delay, including all retransmission timeouts, then it should be straightforward to implement, for example, using SeqTimeoutsContainer structure (similarly how m_seqLifetimes in ndn::Consumer).
> 
> I think, and would do it when I can get time for that, it is a good idea to export both delay parameters as a trace sources in ndn::Consumer class, as well as write a simple metric helper.
> 
> ---
> Alex
> 
> On Jan 16, 2013, at 5:36 AM, Xiaoke Jiang <shock.jiang at gmail.com> wrote:
> 
>> Hi All, 
>> 	How to trace the latency of request, duration from sending the Interest to receiving corresponding Data.
>> 	
>> 	Is there anyone can give some hint? Thank you in advance.
>> 
>> thanks
>> 
>> My Regards,
>> Xiaoke Jiang （蒋小可）
>> 
>> Ph.D Candidate,
>> Dept. of Computer Science and Technology,
>> Tsinghua University, P. R. China
> 

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