<div dir="ltr"><div>Hi André</div><div><br></div><div>The number of faces in an application should be O(1).</div><div>If you have O(N) or O(log N) faces, you are doing it wrong.<br></div><div><br></div>Most applications only have one or two faces.<div>You can send and receive multiple packets through the same face.<br></div><div><br></div><div>Yours, Junxiao<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 19, 2021 at 10:47 PM André Dexheimer <<a href="mailto:adcarneiro@inf.ufrgs.br">adcarneiro@inf.ufrgs.br</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><p style="text-align:center"><font color="red"><b>External Email</b><br></font></p><div dir="auto"><div>Hello Junxiao</div><div dir="auto"><br></div><div dir="auto">Thank you for the quick response.</div><div dir="auto"><br></div><div dir="auto">I have 6 CPU cores and 12GB of RAM allocated to the virtual machine. </div><div dir="auto"><br></div><div dir="auto">The consumer-with-timer was slightly modified to schedule a variable number of consumer requests at a variable period.</div><div dir="auto"><br></div><div dir="auto">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?</div><div dir="auto"><br></div><div dir="auto">Best regard,</div><div dir="auto">Andre<br><div class="gmail_extra" dir="auto"><br><div class="gmail_quote">On Apr 19, 2021 22:48, Junxiao Shi <<a href="mailto:shijunxiao@email.arizona.edu" target="_blank">shijunxiao@email.arizona.edu</a>> wrote:<br type="attribution"><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Andre</div><div><br></div><div>How much hardware resources did you allocate to the topology?</div><div>Since you have 8 nodes, you need at least 8 CPU cores and 8GB RAM for a smooth operation.<br></div><div><br></div><div>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.<br></div><div>Forking and joining all those short-lived processes, as well as NFD accepting and closing the faces, would cause significant overhead.</div><div>You should instead use a long-lived consumer program, such as the ndnping client.<br></div><div><br></div><div>Yours, Junxiao<br></div></div><br><div><div dir="ltr">On Mon, Apr 19, 2021 at 9:36 PM Andre via Mini-NDN <<a href="mailto:mini-ndn@lists.cs.ucla.edu" target="_blank">mini-ndn@lists.cs.ucla.edu</a>> wrote:<br></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div><p style="text-align:center"><font color="red"><b>External Email</b><br></font></p>
<p> Hi</p>
<p><br>
</p>
<p>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.<br>
</p>
<p><br>
</p>
<p><img alt=""></p>
<p><br>
</p>
<p>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. <br>
</p>
<p>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.</p>
<p>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?</p>
<p><br>
</p>
<p>Thanks in advance,</p>
<p>André Dexheimer Carneiro<br>
</p>
<p><br>
</p>
<p><br>
</p>
</div>
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