[ndnSIM] Getting PIT & CS Size simultaneously?

[Spyridon (Spyros) Mastorakis]

Hello,

when the number of data chunks included in a CS is growing, the router receives data packets for interests sent towards the data producers. That is to say, the pending interests included in the PIT are satisfied (thus deleted from the PIT), because the requested chunks of data were received. In this way, the CS size is growing, while the pending interests included in PIT are satisfied. 

On the other hand, when an interest is sent, but it is not satisfied by a data packet (i.e., a data packet is not received), the pending interest will remain in PIT until a time out occurs. In this way, the number of PIT entries will become bigger, while no data packets would be received.

--
Spyridon (Spyros) Mastorakis
Personal Website: http://cs.ucla.edu/~mastorakis/
Internet Research Laboratory
PhD Computer Science
UCLA




> On Feb 13, 2015, at 9:03 AM, Narges Mehran <narges.mehran at gmail.com> wrote:
> 
> Hello everyone,
> 
> I have a question: why can't I see the PIT and CS Size simultaneously,
> It means I can see CS Size in normal way but when I want to see the
> PIT size, I have to change the prefix of producer! e.g.,
> 
> Names::Add ("consumer1", nodes.Get (0));
> Names::Add ("router"   , nodes.Get (1));
> Names::Add ("producer1" , nodes.Get (2));
> 
> Ptr<Node> consumer1 = Names::Find<Node> ("consumer1");
> Ptr<Node> producer1 = Names::Find<Node> ("producer1");
> 
> // Install CCNx stack on all nodes
> ndn::StackHelper ndnHelper;
> ndnHelper.SetDefaultRoutes (true);
> ndnHelper.SetPit ("ns3::ndn::pit::Persistent::AggregateStats");
> ndnHelper.SetForwardingStrategy ("ns3::ndn::fw::Flooding");
> ndnHelper.SetContentStore ("ns3::ndn::cs::Lru::AggregateStats",
>                             "MaxSize", "5"); //Size = 5!
> ndnHelper.InstallAll ();
> 
> 
> //  Consumer1
> ndn::AppHelper consumerHelper ("ns3::ndn::ConsumerCbr");
> //  Consumer will request /prefix/0, /prefix/1, ...
> consumerHelper.SetPrefix ("/prefix");
> consumerHelper.SetAttribute ("Frequency", StringValue ("10")); // 10
> interests a second
> consumerHelper.SetAttribute ("MaxSeq",StringValue("20"));
> consumerHelper.Install (consumer1); // first node
> 
> // Producer1
> ndn::AppHelper producerHelper ("ns3::ndn::Producer");
> // Producer will reply to all requests starting with /prefix
> producerHelper.SetPrefix ("/prefix123");
> //////////////////////////////why???\\\\\\\\\\\\\\
> producerHelper.SetAttribute ("PayloadSize", StringValue("1024"));
> producerHelper.Install (producer1);
> .
> .
> .
> /////////////////output in abnormal way\\\\\\\\\\\\\\\\\\\\\\\\
> PIT Size         CS Size
> 30                  0
> \\\\\\\\\\\\\\\\\\/////////////////////////////////////////
> 
> /////////////////output in normal way\\\\\\\\\\\\\\\\\\\\\\\\ ----->
> producerHelper.SetPrefix ("/prefix");
> PIT Size         CS Size
> 0                  20
> \\\\\\\\\\\\\\\\\////////////////////////////////////////
> 
> Besides, when the max size of CS is "5", why the output is "20"?
> 
> I don' know where my problem is! Any help?
> 
> Tnx in advance
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