Please help me create this CLI CPU Scheduling Simulator in java:
Process information
The process information will be read from an input file. The format is:
pid arrival_time burst_time
All of fields are integer type where:
The program will be run from the command line where you provide the name of the file where the processes are stores.
The simulator first reads task information from input file and stores all data in a data structure. Then it starts simulating one scheduling algorithm in a time-driven manner. At each time unit (or slot), it adds any newly arrived task(s) into the ready queue and calls a specific scheduler algorithm in order to select appropriate task from ready queue. When a task is chosen to run, the simulator prints out a message indicating what process ID is chosen to execute for this time slot. If no task is running (i.e. empty ready queue), it prints out an "idle" message. Before advancing to the next time unit, the simulator should update all necessary changes in task and ready queue status
Inputs and Outputs
Sample input files and expected outputs are shown in the Appendix. You can use it to verify your results. Notice that these input files are not for testing and grading your program in.
Command-line Usage Examples:
myCPUScheduler input_file [FCFS|RR|MLFQ]
Input file example:
% more input.txt
PID Arrival Burst
1 0 10
2 1 9
3 2 8
4 3 7
Output:
When a task is scheduled, the simulator will simply print out what task is selected to run at a time. Show the status of related process at each scheduling event, e.g.,: starts running, has finished, is preempted into Queue #, or continues running.
Print statistical information. As soon as all tasks are completed, the program should compute and print 1) average waiting time, 2) average response time, 3) average turnaround time.
%myCPUScheduler input_file FCFS
Selected Scheduling algorithm: FCFS
PID starts runningat TIME
PID has finished at TIME
PID starts runningat TIME
PID has finished at TIME
…
=============================
Average waiting time: 10.00 ms
Average response time: 3.00 ms
Average turnaround time: 13.00 ms
// Java program for implementation of FCFS
// scheduling
import java.io.File;
import java.io.FileNotFoundException;
import java.text.ParseException;
import java.util.Scanner;
public class FCFS {
// Function to find the waiting time for all
// processes
static void findWaitingTime(int processes[], int
n,
int bt[], int
wt[]) {
// waiting time for first process
is 0
wt[0] = 0;
// calculating waiting
time
for (int i = 1; i < n; i++)
{
wt[i] = bt[i -
1] + wt[i - 1];
}
}
// Function to calculate turn around time
static void findTurnAroundTime(int processes[], int
n,
int bt[], int
wt[], int tat[]) {
// calculating turnaround time by
adding
// bt[i] + wt[i]
for (int i = 0; i < n; i++)
{
tat[i] = bt[i] +
wt[i];
}
}
//Function to calculate average time
static void findavgTime(int processes[], int n, int
bt[]) {
int wt[] = new int[n], tat[] = new
int[n];
int total_wt = 0, total_tat =
0;
//Function to find waiting time
of all processes
findWaitingTime(processes, n, bt,
wt);
//Function to find turn around
time for all processes
findTurnAroundTime(processes, n,
bt, wt, tat);
//Display processes along with
all details
System.out.printf("Processes Burst
time Waiting"
+" time Turn around
time\n");
// Calculate total waiting time
and total turn
// around time
for (int i = 0; i < n; i++)
{
total_wt =
total_wt + wt[i];
total_tat =
total_tat + tat[i];
//
System.out.printf(" %d ", (i + 1));
//
System.out.printf(" %d ", bt[i]);
//
System.out.printf(" %d", wt[i]);
//
System.out.printf(" %d\n", tat[i]);
}
float s = (float)total_wt /(float)
n;
int t = total_tat / n;
System.out.printf("Average waiting
time = %f", s);
System.out.printf("\n");
System.out.printf("Average turn
around time = %d ", t);
}
// Driver code
public static void main(String[] args) throws
ParseException, FileNotFoundException {
String fileName;
Scanner scanner=new
Scanner(System.in);
fileName=scanner.nextLine();
File file = new
File(fileName);
int processesid[]=new
int[100];
int arrival[]=new int[100];
int burst[]=new int[100];
Scanner sc = new
Scanner(file);
int i=0,j=0;
while(sc.hasNext())
{
String s=sc.nextLine();
System.out.println(s);
String
str[]=s.split(" ");
processesid[i]=Integer.parseInt(str[j++]);
arrival[i]=Integer.parseInt(str[j++]);
burst[i]=Integer.parseInt(str[j]);
j=0;
i++;
}
findavgTime(processesid, i--, burst);
}
}
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