To calculate the network computational efficiency in OMNeT++ has needs to include calculating how successfully a network node or the whole network uses its computational resources to succeed its objectives like processing data, running algorithms, or implementing protocols. Computational efficiency can be measured by comparing the amount of computational work done like tasks processed against the resources consumed such as energy and CPU time.

**Steps to Calculate Network Computational Efficiency in OMNeT++:**

**Set Up the Network Model:**- Define the network topology using NED files in OMNeT++. Contain nodes like routers, base stations, or any devices that execute computational tasks. On each node configure the network to reflect the computational load.

**Implement Computational Task Logic:**- Mimic the computational tasks executed by each node. This could encompass processing data packets, running algorithms, or executing protocols. Follow the number of tasks or the amount of data processed by each node.

**Track Computational Resource Usage:**- Observe the computational resources spent by each node. This could contain CPU time, memory usage, or energy consumption correlated to computation. In OMNeT++, this can be mimicked using custom logic or by expanding existing modules.

**Calculate Computational Efficiency:**- Computational efficiency can be evaluated as the ratio of the work done like tasks completed, data processed to the resources consumed that is Computational Efficiency=Total Work DoneTotal Computational Resources Consumed\text{Computational Efficiency} = \frac{\text{Total Work Done}}{\text{Total Computational Resources Consumed}}Computational Efficiency=Total Computational Resources ConsumedTotal Work Done
- This metric can be stated in numerous units, like tasks per second, tasks per joule, or data processed per CPU cycle, depending on the specific resource being measured.

**Log or Analyse Computational Efficiency:**- Log the computational efficiency periodically or measure it at the end of the simulation to analyse how successfully the network or each nodes are using their computational resources during the simulation.

**Example Implementation: Computational Efficiency Calculation**

Given below is an example of how to calculate the computational efficiency in OMNeT++ using custom logic:

#include <omnetpp.h>

using namespace omnetpp;

class ComputationalEfficiencyModule : public cSimpleModule {

private:

int totalTasksProcessed; // Total number of computational tasks processed

double totalCpuTimeUsed; // Total CPU time used (in seconds)

simsignal_t computationalEfficiencySignal; // Signal to record computational efficiency

protected:

virtual void initialize() override {

totalTasksProcessed = 0;

totalCpuTimeUsed = 0.0;

computationalEfficiencySignal = registerSignal(“computationalEfficiencySignal”);

// Schedule the first computational efficiency calculation

scheduleAt(simTime() + par(“checkInterval”).doubleValue(), new cMessage(“calculateComputationalEfficiency”));

}

virtual void handleMessage(cMessage *msg) override {

if (strcmp(msg->getName(), “calculateComputationalEfficiency”) == 0) {

// Calculate and emit computational efficiency

double computationalEfficiency = (totalCpuTimeUsed > 0) ? totalTasksProcessed / totalCpuTimeUsed : 0.0;

emit(computationalEfficiencySignal, computationalEfficiency);

EV << “Computational Efficiency: ” << computationalEfficiency << ” tasks/second\n”;

// Schedule the next calculation

scheduleAt(simTime() + par(“checkInterval”).doubleValue(), msg);

} else {

// Simulate processing a computational task

processTask(msg);

}

}

void processTask(cMessage *msg) {

// Simulate the time taken to process the task (e.g., CPU time)

double taskCpuTime = par(“taskCpuTime”).doubleValue();

// Update total tasks processed and total CPU time used

totalTasksProcessed++;

totalCpuTimeUsed += taskCpuTime;

EV << “Processed task. Total tasks: ” << totalTasksProcessed << “, Total CPU time: ” << totalCpuTimeUsed << ” seconds\n”;

// Simulate the delay of processing the task

scheduleAt(simTime() + taskCpuTime, msg);

}

virtual void finish() override {

// Calculate and log the final computational efficiency

double computationalEfficiency = (totalCpuTimeUsed > 0) ? totalTasksProcessed / totalCpuTimeUsed : 0.0;

EV << “Final Computational Efficiency: ” << computationalEfficiency << ” tasks/second\n”;

}

};

Define_Module(ComputationalEfficiencyModule);

**Explanation:**

**ComputationalEfficiencyModule:****totalTasksProcessed:**A counter that follow the total number of computational tasks processed by the node.**totalCpuTimeUsed:**A variable that tracks the total CPU time used simulating computational resource consumption and to process these tasks,.**computationalEfficiencySignal:**Registers a signal to emit the estimated computational efficiency for logging or analysis.

**initialize() Function:**- Lists the first calculation of computational efficiency and initializes the counters and

**handleMessage() Function:****calculateComputationalEfficiency:**Periodically computes the computational efficiency based on the total CPU time used and the total tasks processed. The efficiency is then produced as a signal and logged.**processTask:**Mimics the processing of a computational task by incrementing the task counter and joining to the CPU time used. The task processing is simulated with a delay proportional to the CPU time needed.

**finish() Function:**- At the end of the simulation, logs the finishing computational efficiency

**Run the Simulation:**

- Compile and run the OMNeT++ project. The simulation will log and track the computational efficiency, offering insights into how efficiently each node is using its computational resources.

**Analyse and Interpret Results:**

- The computational efficiency metric gives the insights into how well the network or each nodes are using their computational resources. Higher computational efficiency specifies that the nodes are efficiently processing tasks with least resource usage.

**Additional Considerations:**

**Different Types of Workloads:**If the network nodes process various kinds of tasks like packet processing, encryption, routing, we may need to evaluate computational efficiency separately for each type of workload.**Resource Constraints:**If the network nodes have limited computational resources like limited CPU cycles or energy, consider how these constraints affect computational efficiency.**Heterogeneous Nodes:**In networks with heterogeneous nodes like nodes with numerous processing capabilities, consider comparing computational efficiency across various kinds of nodes to calculate their related performance.

Finally, we are understood how to evaluate the Network Computational Efficiency in OMNeT++ and additional considerations. We will present further details as per your needs.

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