Types of Operating System

Definition

Different types of operating systems are designed for specific tasks and environments.

Key Point

Distributed OS
• Description: Runs on multiple devices, distributing processing load
• Example Use: Cloud computing, clusters

Embedded OS
• Description: Designed for specific hardware with limited functions
• Example Use: Smart appliances, IoT devices

Multi-tasking OS
• Description: Multiple tasks run seemingly simultaneously
• Example Use: Desktop computers, smartphones

Multi-user OS
• Description: Multiple users access system simultaneously
• Example Use: Servers, mainframes

Real-Time OS (RTOS)
• Description: Processes data in real-time with strict timing
• Example Use: Medical devices, aircraft systems

Exam Tip

Real-Time OS: Critical in safety-critical environments where timing is essential. Must guarantee response times (hard real-time) or meet deadlines statistically (soft real-time).

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Question

Multi-tasking Operating Systems

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Answer

Allows more than one program to run at the same time on one computer, by switching processor time between them so quickly that they appear to run simultaneously, for example editing a document while checking email.

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Browse all 5 flashcards on Types of Operating Systems

Multi-tasking Operating Systems
Allows more than one program to run at the same time on one computer, by switching processor time between them so quickly that they appear to run simultaneously, for example editing a document while checking email.
Multi-User Operating Systems
Allows several users to use the same computer at the same time, typically from separate terminals, sharing its processor time and resources between them. This is more than one machine simply holding several user accounts.
Distributed Operating Systems
Allows several networked computers to work together on a single task, sharing the processing between them while appearing to the user as one system.
Real-Time Operating Systems
Processes inputs and responds within a guaranteed, predictable time. It is used in safety-critical systems, such as aircraft control or a self-driving car, where a late response could be dangerous.
Embedded Operating Systems
System software built into a device and specific to its hardware and purpose, so it has a limited, dedicated function. It is held in ROM and so cannot be changed, for example in a washing machine.

Exam questions on Types of Operating Systems

3 OCR past paper questions (13 marks) with mark schemes

Question 1H446/016 marks
Each virtual machine will run an operating system. One type of operating system is multi-user. Describe two other types of operating system and give an example of where each may be used.
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Multi Tasking - is optimised to deal with multiple processes simultaneously/concurrently ...Can run multiple programs/tasks at the same time. Example: Home/personal computer Distributed - Designed to run the same task over multiple machines. Example: SETI or other cloud-based processes// Clusters of desktops used for rendering/calculations Embedded - Will have a restricted set of operations (to conserve resources) ... is read only. Example: Domestic appliance such as a washing machine Real-Time - optimised to handle and respond to inputs with no wait/within a guaranteed response time/immediate. Example: Used in "mission critical" systems such as aircraft control (6 marks - 1 mark for type, 1 for description, 1 for example per OS, max 6)
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Question 2H446/01 · June 20231 mark
A small manufacturing business uses networked computers with closed source application software installed. One computer owned by the business monitors critical-safety features of manufacturing. All input data must be processed within a predictable timescale of a fraction of a second. State the type of operating system that should be used by this computer.
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Real time (1 mark)
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Question 3H446/01 · June 20236 marks
Give the name of three other types of operating system, and for each state its purpose.
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Multi-tasking … runs multiple programs at the same time Multi-user … allows multiple users at the same time Distributed … allows multiple computers to work together on a single task Embedded … has a dedicated/limited function …is read-only / cannot be changed (6 marks - mark in pairs: 1 for type, 1 for purpose per OS)
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/ 6

Exam questions on Types of Operating Systems

Past paper questions