1. SJF

4. 6 sec

5. 6 sec 4 sec

6. 6 sec 4 sec 8 sec

7. 6 sec 4 sec 8 sec 3 sec

8. 6 sec 4 sec 8 sec 3 sec

9. 6 sec 4 sec 8 sec 3 sec

10. 6 sec 4 sec 8 sec 3 sec

11. 6 sec 4 sec 8 sec

12. 6 sec 8 sec

13. 6 sec 8 sec

14. 8 sec

15. 8 sec

18. At time 0: P1 start

19. At time 2: P2 arrive P2 needs 4 sec P1 still needs (7-2)= 5 sec

20. At time 2: P2 needs 4 sec P1 still needs (7-2)= 5 sec

21. At time 2: 4 sec < 5 sec

22. At time 2: So, Begin P2

23. At time 4: P3 arrive P3 needs 1 sec P2 still needs (4-2)= 2 sec

24. At time 4: P3 arrive P3 needs 1 sec P2 still needs (4-2)= 2 sec

25. At time 4: 1sec < 2 sec

26. At time 4: So, Begin P3

27. At time 5: P4 arrive P4 needs 4 sec P2 still needs (4-2)= 2 sec P1 still needs= 5 sec

28. At time 5: P4 arrive P4 needs 4 sec P2 still needs (4-2)= 2 sec P1 still needs= 5 sec

29. At time 5: 2 sec < 4sec< 5sec

30. At time 5: So, Return to P2

31. At time 7: P2 finish P1 stitt needs = 5 sec P4 needs = 4 sec

32. At time 7: P2 finish P1 stitt needs = 5 sec P4 needs = 4 sec

33. At time 7: 4sec< 5sec

34. At time 7: So, begin to P4

35. At time 11: P4 finish no more process

36. At time 11: So, return to P1