How to Get the Remaining Length of the Cloudlet to be Executed in VM?
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Condition for Get the Remaining Length of the Cloudlet to be Executed in VM
Description: To get the remaining length of a cloudlet in a Virtual Machine (VM) in CloudSim, use the getRemainingCloudletLength() method from the Cloudlet class. This method returns the number of instructions or processing time still required for the cloudlet to finish. As the VM executes the cloudlet, the remaining length decreases based on available resources like CPU and memory. Periodic calls to this method allow monitoring of cloudlet progress and determination of remaining work, which helps in dynamic resource allocation, load balancing, or performance monitoring within cloud simulations.
Sample Code
import org.cloudbus.cloudsim.*;
import org.cloudbus.cloudsim.core.CloudSim;
import java.util.ArrayList;
import java.util.List;
import java.util.Calendar;
import org.cloudbus.cloudsim.provisioners.*;
public class CloudletRemainingLengthExample {
public static void main(String[] args) {
try {
// Step 1: Initialize CloudSim
int numUsers = 1; // Number of cloud users
Calendar calendar = Calendar.getInstance();
boolean traceFlag = false; // No event tracing
CloudSim.init(numUsers, calendar, traceFlag);
// Step 2: Create a Datacenter and a Broker
Datacenter datacenter = createDatacenter("Datacenter_0");
DatacenterBroker broker = new DatacenterBroker("Broker_0");
// Step 3: Create and submit VMs and Cloudlets
List vmList = createVM(broker.getId(), 1);
broker.submitVmList(vmList);
List cloudletList = createCloudlet(broker.getId(), 1);
broker.submitCloudletList(cloudletList);
// Step 4: Start the simulation
CloudSim.startSimulation();
// Step 5: Stop the simulation after the simulation time ends
CloudSim.stopSimulation();
// After simulation, print remaining length for each cloudlet
for (Cloudlet cloudlet : cloudletList) {
System.out.println("Remaining length of Cloudlet " + cloudlet.getCloudletId() + ": " +
cloudlet.getCloudletLength());
}
System.out.println("Simulation Finished");
} catch (Exception e) {
e.printStackTrace();
}
}
// Method to create a Datacenter with specified resources
private static Datacenter createDatacenter(String name) throws Exception {
List hostList = new ArrayList<>();
// Host configuration
int hostId = 0;
int ram = 20480; // 20 GB RAM
long storage = 1000000; // 1 TB Storage
int bw = 10000; // 10 GB Bandwidth
int cores = 4; // Number of cores
int mips = 10000; // MIPS
List peList = new ArrayList<>();
for (int i = 0; i < cores; i++) {
peList.add(new Pe(i, new PeProvisionerSimple(mips))); // Create processing elements
}
hostList.add(new Host(
hostId,
new RamProvisionerSimple(ram),
new BwProvisionerSimple(bw),
storage,
peList,
new VmSchedulerTimeShared(peList)
));
String arch = "x86";
String os = "Linux";
String vmm = "Xen";
DatacenterCharacteristics characteristics = new DatacenterCharacteristics(
arch, os, vmm, hostList, 10.0, 3.0, 0.05, 0.001, 0.0
);
return new Datacenter(name, characteristics, new VmAllocationPolicySimple(hostList), new ArrayList<>(), 0);
}
// Method to create a list of VMs
private static List createVM(int brokerId, int vmCount) {
List vmList = new ArrayList<>();
int mips = 1000;
int size = 10000; // 10 GB Storage
int ram = 2048; // 2 GB RAM
long bw = 1000; // 1 GB Bandwidth
int pesNumber = 1; // Number of cores
String vmm = "Xen";
for (int i = 0; i < vmCount; i++) {
Vm vm = new Vm(i, brokerId, mips, pesNumber, ram, bw, size, vmm, new CloudletSchedulerTimeShared());
vmList.add(vm);
}
return vmList;
}
// Method to create a list of Cloudlets
private static List createCloudlet(int brokerId, int cloudletCount) {
List cloudletList = new ArrayList<>();
long length = 40000; // Cloudlet length (number of instructions)
long fileSize = 300; // File size
long outputSize = 300; // Output size
int pesNumber = 1; // Number of cores
UtilizationModel utilizationModel = new UtilizationModelFull();
for (int i = 0; i < cloudletCount; i++) {
Cloudlet cloudlet = new Cloudlet(i, length, pesNumber, fileSize, outputSize,
utilizationModel, utilizationModel, utilizationModel);
cloudlet.setUserId(brokerId);
cloudletList.add(cloudlet);
}
return cloudletList;
}
}
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