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Mindmap
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Gladys Mba
, erstellt am
more than 1 year ago
A level, A2 IT (Chapter 2) Mindmap am 2b Operating Systems, erstellt von Gladys Mba am 12/12/2016.
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chapter 2
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Gladys Mba
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7241805
mind_map
2017-05-02T16:01:13Z
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
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
Processing takes place when other
processors are idle from normal
task e.g. at night
Server assigns tasks to other processors
Result gathered by co-ordinating device
to produce final output
e.g multi-player games or research applications
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
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7241805
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2017-05-02T16:01:13Z
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