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

[Xiaoke Jiang]

Hi Alex,
	I am checking the schema of trace file.
Node: node id, global unique
AppId: app id, local unique on the node, not global
SeqNo: seq number of the interest-Data
Type: LastDelay means last Interest-Data delay, FullDelay means request delay (including retransimission)
DelayS: delay by seconds
DelayUS: delay bey seconds x 10^-6 (microsecond)


Am I right?

thanks

My Regards,
Xiaoke Jiang （蒋小可）

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

On Jan 19, 2013, at 10:06 AM, Alex Afanasyev <alexander.afanasyev at ucla.edu> wrote:

> Thanks for pointing this out.  
> 
> Somehow I had a wrong rule in .gitignore and didn't notice that topology file never got committed till now.  Should be there now.
> 
> ---
> Alex
> 
> On Jan 18, 2013, at 5:59 PM, Xiaoke Jiang <shock.jiang at gmail.com> wrote:
> 
>> Hi Alex,
>> 	I can't find ""src/ndnSIM/examples/topologies/topo-tree.txt"", In fact there is no topologies directory on the GitHub. 
>> 
>> thanks
>> 
>> My Regards,
>> Xiaoke Jiang （蒋小可）
>> 
>> Ph.D Candidate,
>> Dept. of Computer Science and Technology,
>> Tsinghua University, P. R. China
>> 
>> On Jan 19, 2013, at 8:45 AM, Alex Afanasyev <alexander.afanasyev at ucla.edu> wrote:
>> 
>>> Hi Xiaoke,
>>> 
>>> I have implemented a basic latency measurements in ndn::Consumer app (should work in all derivative-classes as well) and a simple tracing helper. 
>>> You give it a try and tell me if something is wrong or strange.
>>> 
>>> You can check out basic doc here: http://ndnsim.net/metric.html#application-level-trace-helper
>>> 
>>> ---
>>> Alex
>>> 
>>> On Jan 17, 2013, at 12:35 AM, Xiaoke Jiang <shock.jiang at gmail.com> wrote:
>>> 
>>>> 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
>>>>> 
>>>> 
>>>> _______________________________________________
>>>> ndnSIM mailing list
>>>> ndnSIM at lists.cs.ucla.edu
>>>> http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
>>> 
>> 
> 

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