[ndnSIM] Current size of CS & PIT

[Hussein AlOmaisi]

Hi Zakrai,
1.a) How to calculate the total of entries in the CS at each second of the
simulation time?2) Similarly, is there any way to obtain the number of entries in the PIT
by time?
To get PIT and CS size (number of entries), her a simple code:
void printPitCSSize(){
  auto currentNode = ns3::NodeList::GetNode(ns3::Simulator::GetContext());
  auto& CurrNodePit = currentNode->GetObject<ndn::L3Protocol>()->getForwarder()->getPit();
  auto& CurrNodeCS = currentNode->GetObject<ndn::L3Protocol>()->getForwarder()->getCs();
  std::cout << "PIT number of entries: " << CurrNodePit.size() << " | CS number of stored packets: " <<  CurrNodeCS.size();
}
to get that information at every specific time, you can schedule calling printPitCSSize() function using ns3::Simulator::Schedule().

1.b) If I use the CS tracer and count the number of cache hits at every second, does this give the number of entries at that time?
No. Cache hits do not express the total number stord packets in the cache. Cache hit only indicates the case that a request has been successfully satisified from the node's local cache. Assume that there are 10 stored packets in the cache, at specific time, 2 requests have been received and satisifed from the local cache, in this case the cache size is 10 while the cache hits is 2.  

I hope it helps.
Best regards,Hussein 
 

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Today's Topics:

  1. Current size of CS & PIT (Zakaria SABIR)


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Message: 1
Date: Wed, 13 Oct 2021 16:21:32 +0100
From: Zakaria SABIR <zakaria.sabir at uit.ac.ma>
To: ndnsim <ndnsim at lists.cs.ucla.edu>
Subject: [ndnSIM] Current size of CS & PIT
Message-ID:
    <CAPQYZ1-5PZpqx10XBtkvzbR8TWkEBnbFn9fYP4Ex9990mBEXQA at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Dear members,

I have 2 questions about the size of the CS and the PIT:

1) How to calculate the total of entries in the CS at each second of the
simulation time? If I use the CS tracer and count the number of cache hits
at every second, does this give the number of entries at that time?

2) Similarly, is there any way to obtain the number of entries in the PIT
by time?

Regards,
Zakaria
?
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