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Thread: Problem with RR

  1. #1
    Junior Member
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    Exclamation Problem with RR

    Hi,
    I write the below code,
    If I'm running code with RR ,all result of SJF algorithm is zero !!
    if i'm running without RR, sjf is ok,
    Why?
    package program;
     
    import java.util.*;
     
     
     
     
     
    public class Algorithm {
     
          int a;
          Random rnd;
          Proccess[] process;
         // Proccess[] ;
          Queue<Proccess> rr;
     
          Queue<Proccess> r2;
         /**
         *
         * @processaram n
         */
        public Algorithm(int n,float Q)
          {
             a = n;
             process = new Proccess[a];
             process = new Proccess[a];
             for (int t = 0 ; t < a ; t++)
             {
                 process[t] = new Proccess();
     
             }
     
             rnd = new Random();
             inputExecutionTime();
              Fcfs();
              RR(Q);
              Sjf();
     
          } 
         private float GenerateRandomExecutionTime()
          {
             int p = 5;
             int b = 15;
             float runTime = rnd.nextFloat() * (b - p) + p;
             float T = Round(runTime,2);
             return T;
          }
            public static float Round(float Rval, int Rpl) {
            float p = (float)Math.pow(10,Rpl);
             Rval = Rval * p;
             float tmp = Math.round(Rval);
             return (float)tmp/p;
      }
             private void inputExecutionTime()
          {
             for (int i = 0; i < a; i++)
             {
     
                process[i].executionTime = GenerateRandomExecutionTime();
                 process[i].name = Integer.toString(i);
     
             }
          }
          public void Sjf()
          {
             System.out.println("Shortest Job First Scheduling");
             float wt = 0; 
                for(int i = 0; i < a; i++){
    	    for(int j = 1; j < (a-i); j++){
    		        if(process[j-1].executionTime > process[j].executionTime){
    		          Proccess t = process[j-1];
    		          process[j-1]=process[j];
    		          process[j]=t;
    		        }
    		      }
                }
                  for (int i = 0; i < a; i++)
                 {
     
                float RTime = 0;
                float waitTimeTemprocess = 0;
                if (i == 0)
                {
                   waitTimeTemprocess = 0;
                   RTime = (waitTimeTemprocess + process[i].executionTime) - process[i].enterTime;
                }
                else
                {
                   for (int j = 0; j < i; j++)
                   {
                      waitTimeTemprocess += (float)(process[j].executionTime);
                   }
     
                   waitTimeTemprocess -= process[i].enterTime;
                   RTime = (waitTimeTemprocess + process[i].executionTime) - process[i].enterTime;
                }
                System.out.println("Enter Time of TH" + process[i].name + ": " + process[i].enterTime);
                System.out.println(" Execution Time of TH" + process[i].name + ": " + process[i].executionTime);
                System.out.println("Waiting of TH" + process[i].name + ": " + waitTimeTemprocess);
                System.out.println("Resprocessonse Time " + process[i].name + ": " + RTime);
                System.out.println("---------------------------");
                wt += waitTimeTemprocess;
     
             }
     
             System.out.println("---------------------------");
             System.out.println("AWT Time ==> SJF: "+ (wt / 5.0F));
             System.out.println();
            }
          public void Fcfs()
          {
             System.out.println("First Come First Served Scheduling");
             float wt = 0; 
     
                  for (int i = 0; i < a; i++)
                 {
     
                float RTime = 0;
                float waitTimeTemp = 0;
                if (i == 0)
                {
                   waitTimeTemp = 0;
                   RTime = (waitTimeTemp + process[i].executionTime) - process[i].enterTime;
                }
                else
                {
                   for (int j = 0; j < i; j++)
                   {
                      waitTimeTemp += (float)(process[j].executionTime);
                   }
     
                   waitTimeTemp -= process[i].enterTime;
                   RTime = (waitTimeTemp + process[i].executionTime) - process[i].enterTime;
                }
                System.out.println("Enter Time of TH" + process[i].name + ": " + process[i].enterTime);
                System.out.println(" Execution Time of TH" + process[i].name + ": " + process[i].executionTime);
                System.out.println("Waiting of TH" + process[i].name + ": " + waitTimeTemp);
                System.out.println("Resprocessonse Time " + process[i].name + ": " + RTime);
                System.out.println("---------------------------");
                wt += waitTimeTemp;
     
             }
     
             System.out.println("---------------------------");
             System.out.println("AWT Time ==> FCFS: "+ (wt / 5.0F));
             System.out.println();
            }
                 public void RR(float Quantum)
          {
              int j = 1;
             float q = Quantum;
             rr = new LinkedList<>();
             r2 = new LinkedList<>();
             System.out.println("Round Robin Scheduling");
             System.out.println();
             float wt = 0;
             float RTime = 0;
             float Total = 0;
             float waitTimeTemp = 0;
             for (int i = 0; i < a; i++)
             {
                 process[i].constET = process[i].executionTime;
                rr.add(process[i]);
     
             }
     
             while (!rr.isEmpty())
             {
                Proccess a = rr.remove();
                if (a.executionTime <= q )
                {
                   Total += a.executionTime;
                   a.exitTime = Total;
                   a.executionTime = 0;
                   r2.add(a);
     
                }
              //  else if (a.executionTime )
               // {
     
               // }
                else 
                {
                   a.executionTime = a.executionTime - q;
                   rr.add(a);
                   Total += q;
                }
             }
     
             while (!r2.isEmpty())
             {
     
                Proccess process = r2.remove();
                if ( process.constET < q)
                {
                    //waitTimeTemprocess = process.enterTime;
                    waitTimeTemp = process.exitTime - process.enterTime - process.constET;
                    RTime = process.exitTime - process.enterTime;
                    System.out.println("Enter Time of TH" + process.name + ": " + process.enterTime);
                    System.out.println("Execution of TH" + process.name + ": " + process.constET);
                    System.out.println("Waiting of TH" + process.name + ": " + waitTimeTemp);
                    System.out.println("Resprocessonse Time " + process.name + ": " + RTime);
                    System.out.println("---------------------------");
                    wt += waitTimeTemp;
     
                }
                else
                {
                    waitTimeTemp = process.exitTime - process.enterTime - q;
                    RTime = process.exitTime - process.enterTime;
                    System.out.println("Enter Time of TH" + process.name + ": " + process.enterTime);
                    System.out.println("Execution of TH" + process.name + ": " + process.constET);
                    System.out.println("Waiting of TH" + process.name + ": " + waitTimeTemp);
                    System.out.println("Resprocessonse Time " + process.name + ": " + RTime);
                    System.out.println("---------------------------");
                    wt += waitTimeTemp;
                }
             }
             System.out.println("---------------------------");
             System.out.println("AWT Time ===> RR: " + (wt / 5.0F));
             System.out.println();
          }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem with RR

    Is there a problem with how you have coded the algorithm?

    How are you trying to debug the code to find the problem?
    I use lots of calls to println() statements to show the values of variables as the code executes.
    If you don't understand my answer, don't ignore it, ask a question.

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