Consider the following set of processes, with the length of the CPU burst given in milliseconds. In the last column, O denotes the highest priority whereas 2 denotes the lowest priority level. Process Arrival Time (ms) Burst Time (ms) Priority P1 0 10 2 P2 3 1 P3 2 0 P4 5 3 0 PS 6 5 1 Draw three Gantt charts that illustrate the execution of these processes using FCFS, preemptive Shortest Job First (SJF), and priority scheduling with round robin (quantum = 2) scheduling algorithms. The preemptive SJF does not use the priority to make its decision. ***To avoid confusion here: If a process of highest priority is currently scheduled, and another process of the highest priority class arrives, newly arriving process MUST WAIT UNTIL THE END OF THE QUANTUM OF THE ACTIVE PROCESS. If a process of a lower priority class is currently scheduled, and a process of higher priority class has arrived, the newly arriving process CAN PREEMPT THE ACTIVE PROCESS WITHOUT WAITING UNTIL THE END OF THE QUANTUM.**** 3 4

Consider the following set of processes, with the length of the CPU burst given in milliseconds. In the last column, O denotes the highest priority whereas 2 denotes the lowest priority level. Process Arrival Time (ms) Burst Time (ms) Priority P1 0 10 2 P2 3 1 P3 2 0 P4 5 3 0 PS 6 5 1 Draw three Gantt charts that illustrate the execution of these processes using FCFS, preemptive Shortest Job First (SJF), and priority scheduling with round robin (quantum = 2) scheduling algorithms. The preemptive SJF does not use the priority to make its decision. *To avoid confusion here: If a process of highest priority is currently scheduled, and another process of the highest priority class arrives, newly arriving process MUST WAIT UNTIL THE END OF THE QUANTUM OF THE ACTIVE PROCESS. If a process of a lower priority class is currently scheduled, and a process of higher priority class has arrived, the newly arriving process CAN PREEMPT THE ACTIVE PROCESS WITHOUT WAITING UNTIL THE END OF THE QUANTUM.** 3 4

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Dynamic Multithreading

An algorithm that executes a single instruction in a uniprocessor system is called a serial algorithm. In the case of a multiprocessor computer system, multiple instructions are executed in parallel. A multithreaded algorithm is an algorithm that enables multiple instances of the code to be executed concurrently.Multithreading is a concept that allows the CPU to execute threads independently while sharing similar resources. It is an important CPU feature that works on the process. Thread is a sequence of instructions that executes in parallel with other threads. Because of multithreading, multiple tasks can be performed within a single process.

Question

Consider the following set of processes, with the length of the CPU burst given in
milliseconds. In the last column, O denotes the highest priority whereas 2 denotes
the lowest priority level.
Process
Arrival Time (ms)
Burst Time (ms)
Priority
P1
0
10
2
P2
3
3
1
P3
2
0
P4
5
3
0
P5
6
5
1
Draw three Gantt charts that illustrate the execution of these processes using FCFS,
preemptive Shortest Job First (SJF), and priority scheduling with round robin
(quantum = 2) scheduling algorithms.
The preemptive SJF does not use the priority to make its decision.
****To avoid confusion here: If a process of highest priority is currently scheduled,
and another process of the highest priority class arrives, newly arriving process
MUST WAIT UNTIL THE END OF THE QUANTUM OF THE ACTIVE PROCESS. If a
process of a lower priority class is currently scheduled, and a process of higher
priority class has arrived, the newly arriving process CAN PREEMPT THE ACTIVE
PROCESS WITHOUT WAITING UNTIL THE END OF THE QUANTUM.****

In the FCFS algorithm, find the time when each process ends.
1.
1
2. 2
3. 3
4. 4
5. 5
6. 6
7.
7
8. 8
9.
9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
P4
P5
P3
P1
P2
y

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