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Operating-Systems-10CS53-unit-1-->View question


Asked On2017-05-17 09:24:39 by:pallaviaithaln

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 An OS is an intermediary between the user of the computer & the computer hardware.
 It provides a basis for application program & acts as an intermediary between user of
computer & computer hardware.
 The purpose of an OS is to provide a environment in which the user can execute the
program in a convenient & efficient manner.
 OS is an important part of almost every computer systems.
User Views:- The user view of the computer depends on the interface used.
 Some users may use PCs. In this the system is designed so that only one user canutilize
the resources and mostly for ease of use where the attention is mailnly onperformances
and not on the resource utilization.
 Some users may use a terminal connected to a mainframe or minicomputers.
 Other users may access the same computer through other terminals. These users may
share resources and exchange information. In this case the OS is designed to maximize
resource utilization- so that all available CPU time, memory & I/O are used efficiently.
 Other users may sit at workstations, connected to the networks of other workstation and
servers. In this case OS is designed to compromise between individual visibility
&resource utilization.
System Views:-We can view system as resource allocator i.e. a computer system has
many resourcesthat may be used to solve a problem. The OS acts as a manager of these
resources. TheOS must decide how to allocate these resources to programs and the users
so that it canoperate the computer system efficiently and fairly.
 A different view of an OS is that it need to control various I/O devices & user
programsi.e. an OS is a control program used to manage the execution of user program to
prevent errors and improper use of the computer. Operating Systems 10CS53
Dept of CSE, SJBIT Page 4
 Resources can be either CPU Time, memory space, file storage space, I/O devices and so
on. 

Answerd on:2015-01-14 Answerd By:Aishwarya-shetty-s

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