[ndnSIM] Print Queue length

Amin Karami amin at ac.upc.edu
Thu Dec 5 15:10:47 PST 2013


Hi llya!
I want to print the number of filled elements in queue in an interface 
in a specific time, not original (predefined) size of the queue. I 
think, i posted wrong title for my question :-)
I could not find related attribute in your suggested link. I found these 
attributes: *Mode, **MaxPackets, **MaxBytes*

Is there any suggestion?


Thank you in advance.

/Amin

On 12/05/2013 07:59 ?.?, Ilya Moiseenko wrote:
> Hi Amin
>
> 1) m_maxPackets is indeed private.
> However, you can access this value by attribute named “MaxPackets"
> See http://www.nsnam.org/docs/release/3.18/doxygen/classns3_1_1_drop_tail_queue.html for details
>
> 2) Technically you can do this in NS3. And in real life routers can have different queue sizes.
>
>
> Ilya
>
> On Dec 4, 2013, at 2:35 AM, Amin Karami <amin at ac.upc.edu> wrote:
>
>> Hi Alex,
>> I am going to print Queue length in a specific interface of a router. I wrote below function:
>>
>> void PeriodicStatsPrinter (Ptr<Node> node, Time next)
>> Ptr<ndn::Pit> pit = node->GetObject<ndn::Pit> ();
>> Ptr<Channel> CH = node->GetDevice(2)->GetChannel(); \\ 2nd interface of the node
>> Ptr<NetDevice> toDev = CH->GetDevice (1); \\ access to its queue
>> PointerValue txQueue;
>> toDev->GetAttribute ("TxQueue", txQueue);
>> std::cout << Simulator::Now ().ToDouble (Time::S) << "\t"
>> << Names::FindName (node) << "\t"
>> << "Max Packets of Queue: " << txQueue.Get<DropTailQueue> ()->m_maxPackets << "\n";
>>
>> 1- But, i faced with this error:
>> ../scratch/RTT/RTT.cc: In function ‘void PeriodicStatsPrinter(ns3::Ptr<ns3::Node>, ns3::Time)’:
>> ../scratch/RTT/RTT.cc:44:6: error: expected primary-expression before ‘<<’ token
>> ./ns3/drop-tail-queue.h:68:12: error: ‘uint32_t ns3::DropTailQueue::m_maxPackets’ is private
>> ../scratch/RTT/RTT.cc:44:58: error: within this context
>>
>> 2- Could i define two Queue lengths for a specific interface in routers? from inside and outside of a link. Or both should be equal?
>>
>>
>> /Amin
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>> ndnSIM at lists.cs.ucla.edu
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