4

Understand Process Management and CPU Scheduling

3

Compare Monolithic, Microkernel, and Layered architectures

2

Identify types of Operating Systems and their uses

1

Understand the basics and evolution of Operating Systems

Imagine a busy school where many students need different facilities.

• One student needs a classroom.

• another wants to use the computer lab.

• while someone else needs the sports ground.

• The principal and school management organize everything by assigning rooms.
• preparing timetables, and resolving conflicts so everyone gets what they need.

• Applications request resources like CPU, RAM, and storage.

• while the OS manages and allocates these resources so programs can run smoothly without conflicts.

Batch Operating System

• Processes jobs in groups without user interaction.

• Advantages: Efficient for repetitive tasks and reduces CPU idle time.

• Disadvantages: Slow response and difficult error debugging.

• Example: Payroll processing.

1

Time-Sharing Operating System

• Allows multiple users to share CPU resources simultaneously.

• Advantages: Fast response and better resource utilization.

• Disadvantages: Security can be challenging; failures may affect multiple users.

• Example: UNIX systems.

2

Real-Time Operating System (RTOS)

• Provides fast and predictable responses within strict time limits.

• Advantages: Reliable and suitable for time-critical applications.

• Disadvantages: Complex and costly to develop.

• Examples: Robotics, medical devices, and air traffic control.

4

Distributed Operating System

• Manages multiple connected computers as one system.

• Advantages: Faster processing, resource sharing, and high scalability.

• Disadvantages: Complex maintenance and network dependency.

• Example: Distributed cloud systems.

3

What is OS Architecture?

01

• OS architecture defines the structure and organization of an operating system.

• It determines how components like memory, files, processes, and drivers interact.

Monolithic Architecture

02

• All major OS services run together in a single kernel.

• Advantages: Fast and efficient.

• Disadvantages: Difficult to maintain; one failure can affect the entire OS.

Microkernel Architecture

03

• Only essential services run in the kernel; others run in user space.

• Advantages: Better security, stability, and fault isolation.

• Disadvantages: Communication overhead can reduce performance.

Layered Architecture

04

• OS functions are divided into organized layers, with each layer communicating with adjacent layers.

• Advantages: Easier maintenance, testing, and debugging.

• Disadvantages: Multiple layers can reduce performance.

4

Memory Management manages RAM, virtual memory, paging, and segmentation.

3

Process Management controls programs, CPU scheduling, and multitasking.

2

OS Architecture organizes components for better performance, security, and stability.

1

An OS bridges users, applications, and hardware.

A. Batch OS

B. Distributed OS

C. Real-Time OS

D. Time-Sharing OS

A. Batch OS

B. Distributed OS

C. Real-Time OS

D. Time-Sharing OS