Friday, April 8, 2011

TYPES OF OPERATING SYSTEM

Below are the types of operating system.


1.Simple Batch System-
Early computers were working machines. The user of the such system did not interact directly with computer system. The user prepared a job, which consisted of the program, the data and the same control information about the nature of job in the form of punch card and submit it to the computer operator to speed up the processing, operator used to prepare batch of similar program and then execute them one by one the output consisted of the result of the program of the output from each job would be sent back to the operator program.



2. Multitasking system-
In computing, multitasking is a method by which multiple task, also known as processes, share common processing resources, such as a C.P.U .The C.P.U executes multiple task by switching between them but the C.P.U switches occur so frequently that the user may interact each program while it is running the act of reassigning the C.P.U from one task to another is called a contact switch.


3. Time Sharing System-
Time shared operating system allows many user to share the computer simultaneously as system rapidly switches to one user to next , each user is given the impression that he or she has his/her own computer where as only one computer is being shared among many user.


4. Multiuser operating System-
It allows many different user to take advantage of the computer resources simultaneously. Time sharing allows many user to work together. It is the use of single server with number of clients. A time shared operating system allows many user to share the computer simultaneously. Multiuser operating system stores the information about the number of user connected to the main server. It provides security to the user from an unauthorized success each user has a private set of programs.


5.Personal Computer System-
In the beginning the operating system running on these pieces was neither multi user nor multitasking the basic goal of these operating system was maximize user convince and responsiveness there job is to provide good interface to a single user they are widely used for word processing and interact access. These system include PC running Microsoft windows and many others.


6. Parallel System-
Most system till date are single processor systems. However multiprocessor system ( aka Parallel System) are becoming popular. Such systems have more then one processor in close Communication, Sharing the computer bus and same time memory and peripheral devices by using multiprocessor system more work can be done in less time. Multiprocessor system are the best choice if several program operator the same data .Data can be store disk and all the processor shares them . Multiprocessor system are more reliable in comparison to single processor system because if one processor fail other processor will share the burden.


7.Distributive computer systems-
It consist of the number of computers that are connected and manage so that they automatically share the job processing load among the constituent computer major regions for building distributed system are resource sharing,computational speed,reliability,communication.


8.Real time systems-
It is a multitasking operating system for real time application such application include industrial robots,space craft,embedded systems.A real time operating systems facilitates the creation of the real time system but doesn't guarantee that final result will be real time this requires correct development of the software.

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