TCP throughput measurement 2 (multiple tcp flows)



N0(Multiple TCP Senders)----P2Plink(5Mbps,2ms)---N1(Multiple TCP Sinks) (put this file under scratch)

#include <fstream>

#include <string.h>


#include "ns3/core-module.h"

#include "ns3/internet-module.h"

#include "ns3/point-to-point-module.h"

#include "ns3/packet-sink.h"

#include "ns3/packet-sink-helper.h"

#include "ns3/applications-module.h"


using namespace ns3;




const int no=3;                           /* number of tcp flows */

Ptr<PacketSink> sink[no];                   /* Pointer to the packet sink application */

uint64_t lastTotalRx[no];                   /* The value of the last total received bytes */

double cur[no];




CalculateThroughput ()


  Time now = Simulator::Now ();                  

  std::cout << now.GetSeconds ();

  for(int j=0;j<no;j++){

    cur[j] = (sink[j]->GetTotalRx () - lastTotalRx[j]) * (double) 8 / 1e6;  

    std::cout << "\t" << cur[j];

    lastTotalRx[j] = sink[j]->GetTotalRx ();



  std::cout << std::endl;

  Simulator::Schedule (MilliSeconds (1000), &CalculateThroughput);





main (int argc, char *argv[])


  NS_LOG_INFO ("Create nodes.");

  NodeContainer n;

  n.Create (2);


  InternetStackHelper internet;

  internet.Install (n);


  NS_LOG_INFO ("Create channels.");


  PointToPointHelper pointToPoint;

  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));

  pointToPoint.SetChannelAttribute ("Delay", StringValue ("2ms"));

  pointToPoint.SetDeviceAttribute("Mtu", UintegerValue(1400));  

  NetDeviceContainer p2pDevices;

  p2pDevices = pointToPoint.Install (n);    


  Ipv4AddressHelper ipv4;


  NS_LOG_INFO ("Assign IP Addresses.");

  ipv4.SetBase ("", "");

  Ipv4InterfaceContainer i = ipv4.Assign (p2pDevices);


  NS_LOG_INFO ("Create Applications.");


  for(int j=0; j<no; j++) { 

    PacketSinkHelper sinkHelper ("ns3::TcpSocketFactory", InetSocketAddress (Ipv4Address::GetAny (), 9+j));

    ApplicationContainer sinkApp = sinkHelper.Install (n.Get(1));

    sinkApp.Start (Seconds (0.0)); 

    sink[j] = StaticCast<PacketSink> (sinkApp.Get (0));



  for(int j=0; j<no; j++) { 

    BulkSendHelper source ("ns3::TcpSocketFactory", (InetSocketAddress (i.GetAddress (1), 9+j)));

    source.SetAttribute ("MaxBytes", UintegerValue (0));

    ApplicationContainer sourceApps=source.Install (n.Get (0));

    sourceApps.Start (Seconds (1.0));

    sourceApps.Stop (Seconds (10.0)); 



  Simulator::Schedule (Seconds (1.0), &CalculateThroughput);


  Simulator::Stop (Seconds (12.0));

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");






If we want to get the throughput for flow 2, we can do like the following step. (The first column is time, and the second is the throughput)


Back to NS3 Learning Guide

Last Modified: 2022/2/5


Dr. Chih-Heng Ke

Department of Computer Science and Information Engineering, National Quemoy University, Kinmen, Taiwan