Download User view

Operating System :
Operating system is an important part of every computer
system.
A computer system can be divided into four components;
 Hardware
 OS
 Application programs
 Users
Hardware – provides basic computing resources
 CPU, memory, I/O devices
Operating system
 Controls and coordinates use of hardware among
various applications and users
Application programs
 The way how system resources are
used to
solve the computing problems of the users
 Word processors, compilers, web browsers,
database systems, video games
Users
 People, machines, other computers
i)User view
ii)System view
iii)System goals
User view
User view of the computer varies by the interface being used
i)For a single user PC -System designed for one user to use its resources, maximize
the work
-designed for ease f use
- some importance to performance and no resource utilization
ii) users sit at a terminal connected to a mainframe or minicomputer
-share resource and exchange information
- designed to maximize resource utilization
iii) users sit at workstations
-dedicated resources is available
-but they also share the resources like networking and servers like
file, compute and print servers
- Designed to compromise b/w individual usability and resource
utilization
System view
From the computer’s point of view the operating system is the program that is the
most intimate with the h/w.
 OS is a resource allocator
Computer sytem has many resources-h/w and s/w to solve the problem
Eg: CPU time,memory space,file-storage space,I/O devices etc.,
Acts as the manager of theses resources
Manages all resources
Decides between conflicting requests for efficient and fair resource use
 OS is a control program
Controls execution of programs to prevent errors and improper use of the
computer
Operating system goals:



Execute user programs and make solving user problems easier.
Make the computer system convenient to use.
Use the computer hardware in an efficient manner.