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7241805
2b Operating Systems
Description
A level, A2 IT (Chapter 2) Mind Map on 2b Operating Systems, created by Gladys Mba on 12/12/2016.
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ict
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chapter 2
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chapter 2
a level, a2
Mind Map by
Gladys Mba
, updated more than 1 year ago
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Created by
Gladys Mba
over 7 years ago
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Resource summary
2b Operating Systems
Roles
Deals with security and passwords
Responds to user input
Manages computer system
Opens and saves files
Allocates memory to applications
Communicates with hardware (using drivers)
Prioritises processes.
Single User
Only one user can use the computer system (processor) at a time.
There can be multiple user ACCOUNTS but they can't be used simultaneously.
e.g. A stand alone computer with no network connection
Multi-user
Can be used by more than one user at a time
e.g. Can refer to a networked server with many devices connected
e.g Can be a mainframe computer with many terminals
Roles
Manage log-ons and permissions
Allocate jobs
Allocate memory to each user.
Multi-tasking
Can process more than one task at the same time
e.g. word processor being opened while a document is printing
Fast single processors can use scheduling to seem like their are multi-tasking
Seems like multitasking
Processors with multiple cores of systems with more than one processor can really multi-task
Distributed processing
Processes using several processors from several computers usually in different locations
Computers need to be networked LAN or WAN
Every computer has its own processor and memory
One computer (usually a server) acts as co-ordinating device
Server assigns tasks to other processors
Result gathered by co-ordinating device to produce final output
Processing takes place when other processors are idle from normal task e.g. at night
e.g multi-player games or research applications
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