[Mini-NDN] [EXT] Timeouts in MiniNDN

[Junxiao Shi]

Hi André

The number of faces in an application should be O(1).
If you have O(N) or O(log N) faces, you are doing it wrong.

Most applications only have one or two faces.
You can send and receive multiple packets through the same face.

Yours, Junxiao

On Mon, Apr 19, 2021 at 10:47 PM André Dexheimer <adcarneiro at inf.ufrgs.br>
wrote:

> *External Email*
> Hello Junxiao
>
> Thank you for the quick response.
>
> I have 6 CPU cores and 12GB of RAM allocated to the virtual machine.
>
> The consumer-with-timer was slightly modified to schedule a variable
> number of consumer requests at a variable period.
>
> How would you suggest that I instantiate the faces to reduce overhead?
> Maybe create an array of faces so that I don't have to wait for each packet
> to arrive before I request the next one?
>
> Best regard,
> Andre
>
> On Apr 19, 2021 22:48, Junxiao Shi <shijunxiao at email.arizona.edu> wrote:
>
> Hi Andre
>
> How much hardware resources did you allocate to the topology?
> Since you have 8 nodes, you need at least 8 CPU cores and 8GB RAM for a
> smooth operation.
>
> If you are using ndn-cxx/examples/consumer-with-timer.cpp unchanged: each
> invocation of this program sends 2 Interests, and then the program exits.
> Forking and joining all those short-lived processes, as well as NFD
> accepting and closing the faces, would cause significant overhead.
> You should instead use a long-lived consumer program, such as the ndnping
> client.
>
> Yours, Junxiao
>
> On Mon, Apr 19, 2021 at 9:36 PM Andre via Mini-NDN <
> mini-ndn at lists.cs.ucla.edu> wrote:
>
> *External Email*
>
> Hi
>
>
> I am running a simple experiment generating traffic between nodes in the
> following topology, where all links have 10ms delay and 10mbits/s of
> bandwidth.
>
>
>
> I am running the default producer and consumer-with-timer from the ndn-cxx
> examples to randomly generate traffic flow between nodes. I am having an
> issue where, after a few seconds of only successful transfers, every
> consumer starts timing out on every request.
>
> When each consumer requests a packet every 100 milliseconds, I get about
> 20 timeouts for every successful transfer. As I raise this period, things
> get better and by a period of 1 second, I get no timeouts. So it seems that
> there is some limitation to how much can be consumed or produced.
>
> So I am wondering, why does this happen? Is it a limitation of the
> consumer or the producer from ndn-cxx? Or is it related to the network
> emulation?
>
>
> Thanks in advance,
>
> André Dexheimer Carneiro
>
>
>
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