[ndnSIM] test

Alex Afanasyev alexander.afanasyev at ucla.edu
Sat Jun 15 10:43:31 PDT 2013

Hi Axel,

I agree with Saran, that we need a little bit more info about what exactly you're trying to evaluate.  What exactly is your expectation of relation between number of users and transmission time?  Are you trying to evaluate something related to congestion scenario or something else?

Increasing number of users would increase transmission time if these users request more unique data that network can serve, so they need to "pace down" or re-request "lost" data.  As Saran mentioned, if you your consumers request exactly the same pieces of data (e.g., you configured them with exactly the same prefix), then PIT and caches will efficiently eliminate effect of multiple users and network will be forwarding Interests/Data, as if there was only one user.   Btw, which consumer type did you try to use in your evaluations?


On Jun 14, 2013, at 8:26 AM, Saran Tarnoi <sarantarnoi at gmail.com> wrote:

> Hi Axel,
> What is the transmission time in your case?
> Is that the number of data packets served by server?
> If it is so, in my opinion, the number of data packets served by the producer (server) could be independent of the number of clients in your case.
> It is because all the clients are connected to the same router and they simultaneously ask for the same content.
> Consequently, the issued interests are aggregated at the router by PIT data structure.
> More specifically, when there is a pending PIT entry for the target content in PIT, the face ID of the successive interest that asks for the same target content is added to the entry.
> So,only one interest per a target content accesses the server.
> The server in turn sends a data packet in response to the pending interest(s).
> --
> Saran Tarnoi
>> Hi,
>> I am doing some tests on the NDN. I am trying to show the impact of the number of user on the transmission time. I create one server, one router and several users. All the users are connected to the router and retrieve the same content at the same time. I thought that increasing the number of user will increase the transmission time but it is not the case. Do you have any explanation to this result.
>> Best regards.
>> Axel Pinto.

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