Condition for Offload Applications in EdgeCloudSim
Description: Offloading applications in EdgeCloudSim involves identifying tasks with high computational or latency requirements and mapping them to suitable VMs in edge servers or cloud resources. The decision to offload considers factors like resource availability, system load, and response time optimization. Once the appropriate VM is selected, the task is executed there, and results are sent back to the edge device, ensuring efficient resource utilization and improved performance.
Sample Code
EdgeApplicationOffload.java: package EdgeApplication;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import org.cloudbus.cloudsim.Log;
import org.cloudbus.cloudsim.core.CloudSim;
import edu.boun.edgecloudsim.core.ScenarioFactory;
import edu.boun.edgecloudsim.core.SimManager;
import edu.boun.edgecloudsim.core.SimSettings;
import edu.boun.edgecloudsim.utils.SimLogger;
import edu.boun.edgecloudsim.utils.SimUtils;
public class EdgeApplicationOffload {
public static void main(String[] args) {
Log.disable(); // Disable console output of CloudSim library
SimLogger.enablePrintLog(); // Enable output for this app
int iterationNumber = 1;
String configFile = "scripts/Edge_Application/config/default_config.properties";
String applicationsFile = "scripts/Edge_Application/config/applications.xml";
String edgeDevicesFile = "scripts/Edge_Application/config/edge_devices.xml";
String outputFolder = "sim_results/ite" + iterationNumber;
SimSettings settings = SimSettings.getInstance();
if (!settings.initialize(configFile, edgeDevicesFile, applicationsFile)) {
SimLogger.printLine("Cannot initialize simulation settings!");
System.exit(0);
}
if (settings.getFileLoggingEnabled()) {
SimLogger.enableFileLog();
SimUtils.cleanOutputFolder(outputFolder);
}
DateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
String now = df.format(Calendar.getInstance().getTime());
SimLogger.printLine("Simulation started at " + now);
try {
int numUsers = 2;
Calendar calendar = Calendar.getInstance();
CloudSim.init(numUsers, calendar, false);
ScenarioFactory factory = new SampleScenarioFactory(
settings.getMinNumOfMobileDev(),
settings.getSimulationTime(),
"NEXT_FIT", // Policy
"TWO_TIER_WITH_EO" // Scenario
);
SimManager manager = new SimManager(factory, settings.getMaxNumOfMobileDev(), "TWO_TIER_WITH_EO", "NEXT_FIT");
manager.startSimulation();
} catch (Exception e) {
SimLogger.printLine("Simulation terminated due to error: " + e.getMessage());
}
now = df.format(Calendar.getInstance().getTime());
SimLogger.printLine("Simulation finished at " + now);
}
}
NewEdgeOrchestrator.java: package EdgeApplication;
import edu.boun.edgecloudsim.edge_client.Task;
import edu.boun.edgecloudsim.edge_orchestrator.EdgeOrchestrator;
import edu.boun.edgecloudsim.utils.SimLogger;
import org.cloudbus.cloudsim.Vm;
import org.cloudbus.cloudsim.core.SimEvent;
public class NewEdgeOrchestrator extends EdgeOrchestrator {
protected String policy;
protected String simScenario;
// Constructor with offload policy and simulation scenario
public NewEdgeOrchestrator(String policy, String simScenario) {
super(policy, simScenario);
this.policy = policy;
this.simScenario = simScenario;
}
// Initialization method for orchestrator
public void initialize() {
SimLogger.printLine("Edge Orchestrator initialized with policy: " + this.policy + " and scenario: " + this.simScenario);
// Additional initialization code if needed
}
// Decide the target device to offload the task to
public int getDeviceToOffload(Task task) {
// Implement logic for choosing the device to offload the task based on available resources
// For simplicity, return a random device ID as an example.
int selectedDeviceId = 0; // Example logic, modify as required
SimLogger.printLine("Task " + task.getAssociatedHostId() + " will be offloaded to device: " + selectedDeviceId);
return selectedDeviceId;
}
// Get the target VM for task offloading
public Vm getVmToOffload(Task task, int deviceId) {
// Logic for choosing the VM to offload the task, e.g., based on available processing power, memory, etc.
Vm selectedVm = new Vm(0, deviceId, 1000, 1, 512, 1000, 10000, "Xen", null); // Example logic
SimLogger.printLine("Task " + task.getAssociatedHostId() + " will be offloaded to VM with ID: " + selectedVm.getId());
return selectedVm;
}
}
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