Algorithm Added (#129)
Tawfik Yasser
GitHub
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26b3e1174f
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675d45473f
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@ -6,3 +6,7 @@
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### Golang
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1. [Interval Scheduling](go/interval-scheduling.go)
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### Java
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1. [Multi-Level Queue Scheduling](java/multi-level-queue-scheduling.java)
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/**
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* @author Tawfik Yasser
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* @since 4-2021
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* */
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// Program imports below
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import java.util.ArrayList;
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import java.util.Scanner;
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// The following class to represent the process
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// ** In future i will fix the name "process" to "Process"
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class process {
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String name;
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int burset_time;
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int arrive_time;
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int waiting_time;
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int turn_round_time;
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int temp_time;
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int queueNumber;
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//Priority Algorithm
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private int processID;
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private int priority;
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public process() {
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this.processID = 0;
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this.priority = 0;
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this.arrive_time = 0;
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this.burset_time = 0;
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}
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public process(String name, int burset_time, int arrive_time) {
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this.arrive_time = arrive_time;
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this.burset_time = burset_time;
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this.name = name;
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this.temp_time = burset_time;
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}
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public process(String name, int burset_time, int arrive_time, int queueNumber) {
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this.name = name;
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this.burset_time = burset_time;
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this.arrive_time = arrive_time;
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this.queueNumber = queueNumber;
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}
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public process(int processID, int priority, int arrivingTime, int burstTime) {
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this.processID = processID;
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this.priority = priority;
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this.arrive_time = arrivingTime;
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this.burset_time = burstTime;
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}
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public int getProcessID() {
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return processID;
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}
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public void setProcessID(int processID) {
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this.processID = processID;
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}
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public int getPriority() {
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return priority;
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}
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public void setPriority(int priority) {
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this.priority = priority;
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}
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public void setWaiting_time(int waiting_time) {
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this.waiting_time = waiting_time;
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}
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public void setTurn_round_time(int turn_round_time) {
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this.turn_round_time = turn_round_time;
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}
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public void setTemp_burset_time(int temp_burset_time) {
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this.temp_time = temp_burset_time;
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}
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public int getWaiting_time() {
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return waiting_time;
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}
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public int getTurn_round_time() {
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return turn_round_time;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public void setBurset_time(int burset_time) {
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this.burset_time = burset_time;
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}
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public void setArrive_time(int arrive_time) {
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this.arrive_time = arrive_time;
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}
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public int getBurset_time() {
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return burset_time;
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}
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public int getTemp_burset_time() {
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return temp_time;
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}
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public int getArrive_time() {
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return arrive_time;
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}
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public int getQueueNumber() {
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return queueNumber;
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}
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public void setQueueNumber(int queueNumber) {
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this.queueNumber = queueNumber;
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}
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public void reduceTime(int time) {
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if(burset_time >= time)
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burset_time = burset_time - time;
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}
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}
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// ****************** The following class to start the MLQ Algorithm, Called from the main
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class MultiLevelQueueScheduling {
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public MultiLevelQueueScheduling() {
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}
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public void MLQ(int number,process[] processes,int quantum){
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float totalwt = 0, totaltat = 0;
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int[] completionTime = new int[number], waitingTime = new int[number], turnaroundTime = new int[number];
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ArrayList<Integer> RRQueue = new ArrayList<Integer>(); // Queue to store Round Robin Processes Indexes
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ArrayList<Integer> FCFSQueue = new ArrayList<Integer>(); // Queue to store FCFS Processes Indexes
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for (int i = 0; i < number; i++) {
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if (processes[i].getQueueNumber() == 1) {
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RRQueue.add(i);
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}else{
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FCFSQueue.add(processes[i].getQueueNumber());
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}
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}
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int[] highPriorityProcessArray = new int[number]; // Array to work on it instead of the RRQueue
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for (int i = 0; i < RRQueue.size(); i++) {
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highPriorityProcessArray[i] = RRQueue.get(i);
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}
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int rem_bt[] = new int[RRQueue.size()]; // Array to store the burst time of each process from RRQueue and work on it.
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for (int i = 0; i < RRQueue.size(); i++) {
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rem_bt[i] = processes[highPriorityProcessArray[i]].getBurset_time();
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}
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int rem_bt_2[] = new int[FCFSQueue.size()]; // Array to store the burst time of each process from FCFSQueue and work on it.
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for (int i =0;i<FCFSQueue.size();i++){
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rem_bt_2[i] = processes[FCFSQueue.get(i)].getBurset_time();
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}
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int t = completionTime[0]; // t is the starting time of executing processes (t=0)
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int flag =0;
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//Starting to execute the processes
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while (true) {
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boolean done = true;
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// Starting of executing the Round Robin Queue Processes
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for (int i = 0; i < RRQueue.size(); i++)
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{
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//Checking if the process arrived and still has burst time
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if (processes[RRQueue.get(i)].getArrive_time() <= t && rem_bt[i] > 0) {
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//System.out.println("Process "+processes[RRQueue.get(i)].getName()+" Arrived Now - Time: "+t);
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// Check again for burst time if still greater than 0
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if (rem_bt[i] > 0) {
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done = false; // Processes still working
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//Checking if the process still has burst time
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if (rem_bt[i] > quantum) {
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System.out.println("Process "+processes[RRQueue.get(i)].getName()+" Running Now.");
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// Increase the value of t of the program and shows how much time a process has been processed.
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t += quantum;
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// Decrease the burst_time of current process by quantum
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rem_bt[i] -= quantum;
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}
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// If burst time is smaller than or equal to quantum. So this is the last loop this process
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else {
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System.out.println("Process "+processes[RRQueue.get(i)].getName()+" Running Now.");
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// Increase the value of t
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t = t + rem_bt[i];
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completionTime[highPriorityProcessArray[i]] = t; //Calculate that process completion time.
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//--> [Turnaround Time = Completion Time - Arrival Time]
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turnaroundTime[highPriorityProcessArray[i]] = completionTime[highPriorityProcessArray[i]]
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- processes[highPriorityProcessArray[i]].getArrive_time();//Calculate the process turnaround time
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//--> [Waiting Time = Turnaround Time - Burst Time]
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waitingTime[highPriorityProcessArray[i]] = turnaroundTime[highPriorityProcessArray[i]]
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- processes[highPriorityProcessArray[i]].getBurset_time();//Calculating the process waiting time
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// And finally that process finished it’s work so the burst time will be ZERO now.
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rem_bt[i] = 0;
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System.out.println("Process "+processes[RRQueue.get(i)].getName()+" Finished Work - Time: "+t);
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}
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}
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}
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//Here we are check if there are another processes need to work in the second queue.
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flag=0;
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for(int k = 0 ; k <RRQueue.size();k++){
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if(rem_bt[k] == 0 || processes[RRQueue.get(k)].getArrive_time() > t){
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flag++;
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}
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}
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}
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//Position a variable to store the position of the processes from the second queue.
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int position =0;
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if(flag==RRQueue.size()){
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//Looping on the second queue and execute the processes until the first queue filled again.
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for (int j = 0; j < FCFSQueue.size(); j++) {
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String fl = " ";//Flag
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do{
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//System.out.println("Process "+processes[FCFSQueue.get(j)].getName()+" Arrived Now - Time: "+t);
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//The following loop to get the process position.
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for(int y =0;y<number;y++){
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if(processes[FCFSQueue.get(j)].getName().equals(processes[y].getName())){
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position = y;
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break;
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}
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}
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//Calculating the Completion time and turnaround time and waiting time for each process in FCFSQueue.
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completionTime[position] = t;
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turnaroundTime[position] = completionTime[position] - processes[position].getArrive_time();
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waitingTime[position] = turnaroundTime[position] - processes[position].getBurset_time();
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if(rem_bt_2[j]==0){
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System.out.println("Process "+processes[FCFSQueue.get(j)].getName()+" Finished Work - Time: "+t);
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}else {
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System.out.println("Process "+processes[FCFSQueue.get(j)].getName()+" Running Now.");
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}
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t++;//Increase the time.
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rem_bt_2[j] -= 1;//Decrease the process burst time.
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//Every unit of time checking if there are new process in the first queue.
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//So we should stop the FCFS queue execution and go back to the first queue because the first queue has higher priority.
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for(int h = 0 ; h<RRQueue.size();h++){
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if(t == processes[RRQueue.get(h)].getArrive_time()){
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System.out.println("Process "+processes[FCFSQueue.get(j)].getName()+" Blocked Temporary (X) at Time: "+t);
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fl = "out";
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break;
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}
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}
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}while(fl.equals(" ") && rem_bt_2[j] >0);
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if(!fl.equals(" ")){
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break;
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}
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}
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}
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// If all processes are done their execution.
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if (done == true)
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break;
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}
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//Printing the final results of execution.
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System.out.println("\nProcess Name\t\t Queue Number \tBurst Time \tCompletion Time \tWaiting Time \tTurnaround Time");
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for (int i = 0; i < number; i++) {
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System.out.println("\n\t" + processes[i].getName() + "\t\t\t\t\t" + processes[i].getQueueNumber() + "\t\t\t\t" + processes[i].getBurset_time() + "\t\t\t\t" + completionTime[i] + "\t\t\t\t" + waitingTime[i] + "\t\t\t\t" + turnaroundTime[i]);
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}
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//Calculating the AVG Waiting Time and Turnaround Time
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for (int i = 0; i < number; i++) {
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totalwt += waitingTime[i];
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totaltat += turnaroundTime[i];
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}
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System.out.println("\n" + "Average Waiting Time is: " + totalwt / number);
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System.out.println("Average Turnaround Time is : " + totaltat / number);
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}
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}
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// The following is the Main function to run the program
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public class Main {
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public static void main(String[] args) {
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System.out.print("\n");
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System.out.println("Welcome to the CPU Scheduler Simulator >>>>> (OS)");
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System.out.println("-------------------------------------------------");
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System.out.println("Running the Multi-Level Queue Scheduling Algorithm");
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multiLevelScheduling();
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}
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public static void multiLevelScheduling() {
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int quantum = 0;
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int number;
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System.out.println("Enter number of processes: ");
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Scanner scanner = new Scanner(System.in);
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number = scanner.nextInt();
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process[] processes = new process[number];
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for (int i = 0; i < number; i++) {
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System.out.println("Enter the name of process " + (i + 1) + " : ");
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String name = scanner.next();
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System.out.println("Enter the arrival time of process " + (i + 1) + " : ");
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int arrival = scanner.nextInt();
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System.out.println("Enter the burst time of process " + (i + 1) + " : ");
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int burst = scanner.nextInt();
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System.out.println("Enter the queue number of process " + (i + 1) + " : ");
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int qNumber = scanner.nextInt();
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process process = new process(name, burst, arrival, qNumber);
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processes[i] = process;
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}
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System.out.println("Enter the quantum time: ");
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quantum = scanner.nextInt();
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MultiLevelQueueScheduling multiLevelQueueScheduling = new MultiLevelQueueScheduling();
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multiLevelQueueScheduling.MLQ(number,processes,quantum);
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}
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}
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