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How to Calculate Network Application Response Time in ns3

To calculate application response time in ns3, we need to measure the time taken for a request to travel from a client to a server and back to the client. Here is complete guide on achieving this in ns3.

Steps for calculation

  1. Set up network topology :
  • create the nodes, network devices, and connections between them. For this we have to set up a basic client-server model or a more complex network.

Install applications :

  • On the nodes, install relevant applications. for an instance, you may install a packet sink on the server and a packet generator on the client.
  1. Generate traffic :
  • To generate traffic from the client to the server, use traffic generation applications like OnOffApplication or BulkSendApplication.
  1. Capture timestamps :
  • We need to capture timestamps at key points, to measure the response time :
    • When the request is sent from the client.
    • When the request is received by the server.
    • When the response is sent from the server.
    • When the response is received by the client.
  1. Calculate response time :
  • To calculate the response time, subtract the send time of the request from the receive time of the response at the client.

Example for calculating application response time in ns3

Here is the example for the calculation of application response time:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/applications-module.h”

#include “ns3/point-to-point-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“ResponseTimeExample”);

void

SendPacket (Ptr<Socket> socket, Time pktInterval, uint32_t pktSize, uint32_t pktCount, Time& sendTime)

{

if (pktCount > 0)

{

socket->Send (Create<Packet> (pktSize));

sendTime = Simulator::Now ();

Simulator::Schedule (pktInterval, &SendPacket, socket, pktInterval, pktSize, pktCount – 1, sendTime);

}

}

void

ReceivePacket (Ptr<Socket> socket, Time& sendTime)

{

Ptr<Packet> packet;

Address from;

while ((packet = socket->RecvFrom (from)))

{

Time recvTime = Simulator::Now ();

Time responseTime = recvTime – sendTime;

NS_LOG_UNCOND (“Response time: ” << responseTime.GetMicroSeconds () << ” microseconds”);

}

}

int

main (int argc, char *argv[])

{

Time::SetResolution (Time::NS);

NodeContainer nodes;

nodes.Create (2);

PointToPointHelper pointToPoint;

pointToPoint.SetDeviceAttribute (“DataRate”, StringValue (“5Mbps”));

pointToPoint.SetChannelAttribute (“Delay”, StringValue (“2ms”));

NetDeviceContainer devices;

devices = pointToPoint.Install (nodes);

InternetStackHelper stack;

stack.Install (nodes);

Ipv4AddressHelper address;

address.SetBase (“10.1.1.0”, “255.255.255.0”);

Ipv4InterfaceContainer interfaces = address.Assign (devices);

uint16_t port = 9;  // Discard port (RFC 863)

// Create a packet sink to receive packets on node 1

PacketSinkHelper packetSinkHelper (“ns3::UdpSocketFactory”, InetSocketAddress (Ipv4Address::GetAny (), port));

ApplicationContainer sinkApps = packetSinkHelper.Install (nodes.Get (1));

sinkApps.Start (Seconds (1.0));

sinkApps.Stop (Seconds (10.0));

// Create a socket to send packets from node 0

Ptr<Socket> source = Socket::CreateSocket (nodes.Get (0), UdpSocketFactory::GetTypeId ());

InetSocketAddress remote = InetSocketAddress (interfaces.GetAddress (1), port);

source->Connect (remote);

Time sendTime;

Simulator::Schedule (Seconds (2.0), &SendPacket, source, MilliSeconds (500), 1024, 10, sendTime);

Ptr<Socket> recvSocket = Socket::CreateSocket (nodes.Get (0), UdpSocketFactory::GetTypeId ());

recvSocket->Bind ();

recvSocket->SetRecvCallback (MakeBoundCallback (&ReceivePacket, sendTime));

Simulator::Run ();

Simulator::Destroy ();

return 0;

}

Explanation

  1. Network topology setup :

Two nodes are created. Those nodes are connected using a point-to-point link.

  1. Application setup :

On server node, PacketSink is installed. and On client node, a Socket is created.

  1. Traffic generation :

From the client node, schedule the sending of packets. Capture the send time of the request packet.

  1. Response time calculation :

Calculate the response time by subtracting the send time from the receive time, on receiving a packet.

  1. Logging :

Log the response time in microseconds.

Overall, we had successfully learned on calculating application response time in ns3 by measuring the time taken for a request to travel from a client to a server and back to the client. Also, we provide more related information on application response time.

Provide us with your information, and we will proceed with a performance analysis. This involves calculating the Application Response Time in ns3simulation and offering you the best outcomes.