[ndnSIM] Confusion about consumer settings

[Klaus Schneider]

Hey Chris,

Can you attach your full simulation file and your topology file?

Did you set different link delays for your consumers? Do they all start 
at the same time?

Maybe it's just randomness. Did you try changing the parameters slightly 
and see a hugely different result?

Best regards,
Klaus



On 4/28/19 9:00 AM, yao930 at mail.ustc.edu.cn wrote:
> Hello all，
> 
> I am doing experiment with ndnSIM2.7 recently, and encountered some 
> strange problems.
> 
> The topology I used has 8 nodes,whick looks like the follows:
> 5
>   \
>    \
> 6---4--3--2--1--0
>    /
>   /
> 7
> Node 5,6,7 is consumer, and node 0 is producer. Bandwidth in 1-2 and 2-3 
> is set to be 1Mbps, and others is set to be 5Mbps. Max packet size is 
> set to be 10 packets. Packet payload is set to be 1024.
> 
> 
> I use 3 consumerHelper to make node 5,6,7 generate interests with 
> different prefix, like:
>   NodeContainer consumerNodes1;
>    NodeContainer consumerNodes2;
>    NodeContainer consumerNodes3;
>    NodeContainer producerNodes;
>    NodeContainer routerNodes;
> 
> 
>    consumerNodes1.Add(Names::Find<Node>("5"));
>    consumerNodes2.Add(Names::Find<Node>("6"));
> 
>    consumerNodes3.Add(Names::Find<Node>("7"));
> 
>    std::string prefix1 = "/A1";
>    std::string prefix2 = "/A2";
>    std::string prefix3 = "/A3";
> 
>    // Install NDN applications
>    ndn::AppHelper consumerHelper1("ns3::ndn::ConsumerZipfMandelbrot");
>    consumerHelper1.SetPrefix(prefix1);
>    consumerHelper1.SetAttribute("Frequency", StringValue("100")); // 100 
> interests a second
>    consumerHelper1.SetAttribute("NumberOfContents", StringValue("5000"));
>    consumerHelper1.Install(consumerNodes1);
> 
>    ndn::AppHelper consumerHelper2("ns3::ndn::ConsumerZipfMandelbrot");
>    consumerHelper2.SetPrefix(prefix2);
>    consumerHelper2.SetAttribute("Frequency", StringValue("100")); // 100 
> interests a second
>    consumerHelper2.SetAttribute("NumberOfContents", StringValue("5000"));
>    consumerHelper2.Install(consumerNodes2);
> 
>    ndn::AppHelper consumerHelper3("ns3::ndn::ConsumerZipfMandelbrot");
>    consumerHelper3.SetPrefix(prefix3);
>    consumerHelper3.SetAttribute("Frequency", StringValue("100")); // 10 
> interests a second
>    consumerHelper3.SetAttribute("NumberOfContents", StringValue("5000"));
>    consumerHelper3.Install(consumerNodes3);
> 
> what I expected is that node5,6,7 should receive data packets equally, 
> but the actual result is node5 receive most, and node7 receive the 
> least. I counted the rate-trace.txt, and the result is:
> 
>     A1Packet: 4460
>     A2Packet: 1386
>     A3Packet: 382
>     totalPacket: 6228
> 
> 
> My questions are：
> 1、why the data packets received by the 3 consumer is so different?
> 2、I observed that in this scenario 1Mpbs bandwidth can transmit at most 
> 120 or so，how is this result calculated?
> 
> Thanks in advance!
> 
> Sincerely,
> Chris Chen.
> 
> 
> 
> 
> 
> 
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