How To Implement Distributed Computing In NS3

To implement the Distributed computing in ns-3 consists to

• Set-up network topology
• Assign the computational task to nodes
• Simulate communication among nodes.

These are the basic steps involves in distributed computing in ns-3 environment, by following the above steps we carry on your work , reach out us for best support.

Now we are going to see the complete procedures to how the distributed computing performs and implement in ns-3.

Step-by-Step Guide to Implement Distributed Computing in ns-3

1. Install ns-3:
   • Ensure ns-3 is installed. You can follow the installation instructions provided in previous responses.
2. Create a Simulation Script:
   • Create a new script file, e.g., distributed-computing.cc.
3. Include Necessary Headers:

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

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

#include “ns3/applications-module.h”

#include <iostream>

#include <vector>

4. Define the Main Function:

using namespace ns3;

int main (int argc, char *argv[])

{

  LogComponentEnable (“UdpEchoClientApplication”, LOG_LEVEL_INFO);

  LogComponentEnable (“UdpEchoServerApplication”, LOG_LEVEL_INFO);

5. Set Up the Network Topology:

• Create nodes and configure network settings:

NodeContainer nodes;

nodes.Create (4);

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);

6. Install Applications:

• Set up a UDP echo server on one node:

UdpEchoServerHelper echoServer (9);

ApplicationContainer serverApps = echoServer.Install (nodes.Get (0));

serverApps.Start (Seconds (1.0));

serverApps.Stop (Seconds (10.0));

Set up a UDP echo client on other nodes:

for (uint32_t i = 1; i < nodes.GetN(); ++i)

{

  UdpEchoClientHelper echoClient (interfaces.GetAddress (0), 9);

  echoClient.SetAttribute (“MaxPackets”, UintegerValue (1));

  echoClient.SetAttribute (“Interval”, TimeValue (Seconds (1.0)));

  echoClient.SetAttribute (“PacketSize”, UintegerValue (1024));

  ApplicationContainer clientApps = echoClient.Install (nodes.Get (i));

  clientApps.Start (Seconds (2.0));

  clientApps.Stop (Seconds (10.0));

}

7. Simulate Distributed Computing Task:

• Implement a simple distributed computing task where nodes send and receive data.
• We can create custom applications that simulate computation and communication.

At the present we provide the illustrative for simple distributed computing task by the use of custom applications:

class DistributedComputingApp : public Application

{

public:

  DistributedComputingApp() {}

  virtual ~DistributedComputingApp() {}

  void Setup(Ptr<Socket> socket, Address address, uint32_t packetSize, uint32_t nPackets, Time interval)

  {

    m_socket = socket;

    m_peer = address;

    m_packetSize = packetSize;

    m_nPackets = nPackets;

    m_interval = interval;

    m_sendEvent = EventId();

  }

  void StartApplication() override

  {

    m_socket->Bind();

    m_socket->Connect(m_peer);

    SendPacket();

  }

  void StopApplication() override

  {

    if (m_sendEvent.IsRunning())

    {

      Simulator::Cancel(m_sendEvent);

    }

    if (m_socket)

    {

      m_socket->Close();

    }

  }

private:

  void SendPacket()

  {

    Ptr<Packet> packet = Create<Packet>(m_packetSize);

    m_socket->Send(packet);

    if (++m_packetsSent < m_nPackets)

    {

      m_sendEvent = Simulator::Schedule(m_interval, &DistributedComputingApp::SendPacket, this);

    }

  }

  Ptr<Socket> m_socket;

  Address m_peer;

  uint32_t m_packetSize;

  uint32_t m_nPackets;

  Time m_interval;

  uint32_t m_packetsSent;

  EventId m_sendEvent;

};

int main(int argc, char *argv[])

{

  // Initialization and network setup as above

  …

  TypeId tid = TypeId::LookupByName(“ns3::UdpSocketFactory”);

  for (uint32_t i = 1; i < nodes.GetN(); ++i)

  {

    Ptr<Socket> socket = Socket::CreateSocket(nodes.Get(i), tid);

    Address address = InetSocketAddress(interfaces.GetAddress(0), 9);

    Ptr<DistributedComputingApp> app = CreateObject<DistributedComputingApp>();

    app->Setup(socket, address, 1024, 5, Seconds(1.0));

    nodes.Get(i)->AddApplication(app);

    app->SetStartTime(Seconds(2.0));

    app->SetStopTime(Seconds(10.0));

  }

  Simulator::Run();

  Simulator::Destroy();

  return 0;

}

Explanation:

In this direction we describe the process for distributed computing in ns-3,

1. Network Configuration:
   • Nodes are created, and a point-to-point link is set up between them.
   • Internet stack and IP addresses are configured for the nodes.
2. Applications:
   • A UDP echo server is installed on one node.
   • UDP echo clients are installed on the other nodes to simulate communication.
3. Distributed Computing Task:
   • A custom application Distributed Computing App is created to simulate a distributed computing task.
   • This application sends packets to a peer node at regular intervals.
   • Multiple instances of this application are installed on the nodes to simulate distributed computing.

Finally we provide information about the distributed computing in ns-3 environment and additionally we provide and support all kinds of distributed computing works.