Queue length

[David Patric]

Hello all,
Can anyone pls help me to find the queue length during the simulation time at every 5 seconds lets say, i tried to look into the trace source and unfortunately i could not find any trace source for queue length....is there any other way i can do it???

thanks in advance

with regards
David

[Konstantinos]

There is a method to get the number of packets directly, no need for trace source. So, you can schedule an event to get the number of packets (or bytes) in that queue.

http://www.nsnam.org/doxygen/classns3_1_1_queue.html#a50dcb693d5325708d8c90770f795eabc

uint32_t ns3::Queue::GetNPackets

(

void

)

const

Returns

The number of packets currently stored in the Queue

Definition at line 125 of file queue.cc.

Regards,

K.

[vyshak srivatsa]

How can i compute queue length at particular node using this ?? presently i am doing  it using WifiMacQueue class in the following way
   PointerValue ptr;
   wd->GetAttribute ("Mac",ptr); //(wd is pointer to wifinetdevice which has an interface to node)
   Ptr<AdhocWifiMac> mac = ptr.Get<AdhocWifiMac> ();
   NS_ASSERT (mac != NULL);
 
   mac->GetAttribute ("DcaTxop",ptr);
   Ptr<DcaTxop> dca = ptr.Get<DcaTxop> ();
   NS_ASSERT (dca != NULL);
  
   Ptr<WifiMacQueue> queue = dca->GetQueue ();
   NS_ASSERT (queue != NULL);
   queue->GetSize ();

but i feel its not working properly because i am always getting queue length as 0

can you please tell me how can i do it from the class which you said above ??

Thnaks in advance

David

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[Tommaso Pecorella]

Hi,

finding a queue size zero is normal, unless you:

1) are in saturated condition (i.e., there is a congestion), or

2) you're in a temporary congestion (i.e., there is a temporary burst of packets or collisions).

The two above conditions are heavily dependant on the traffic model.

If you don't carefully select your scenario, your queue length will be zero (or one, when you're sending one packet).

However this is not an ns-3 thing, it's network queueing systems 101.

T.

[scabbicalboss]

On Tuesday, 18 March 2014 10:40:50 UTC-4, Konstantinos wrote:

There is a method to get the number of packets directly, no need for trace source. So, you can schedule an event to get the number of packets (or bytes) in that queue.

http://www.nsnam.org/doxygen/classns3_1_1_queue.html#a50dcb693d5325708d8c90770f795eabc

uint32_t ns3::Queue::GetNPackets

(

void

)

const

Returns

The number of packets currently stored in the Queue

Definition at line 125 of file queue.cc.

 Hey Konstantinos, quick question. How do you schedule an event to get the number of packets (or bytes) in a queue?, i'm having some trouble with this.

[Konstantinos]

Please read the manual and see other examples in the ns-3

http://www.nsnam.org/docs/release/3.22/manual/html/events.html