Classification of Operating System

Classification of operating systems

The operating systems may be classified into different types depending upon the nature of interaction between the user and his/her program. The various types of operating system are :

1. single user operating system

2. Multi user operating system

3. Batch processing operating system

4. Multi programming operating system

5. Multi tasking operating system

6. Multiprocessing operating system

7. Time sharing operating system

8. Real time system

Distributed system

Multi threading operating system

Single user operating system

· In single user operating system, a single user can access the computer at a particular time.

· The computer, that are based on the operating system have only single processor and execute only a single program at all the time

· Single user is of two type :

1. single user, single-tasking operating system.

2. Single user, multi-tasking operating system

· Single user, single tasking operating system: the single user, single tasking operating system allows a single user to execute one program at a particular time. for example MS-dos and palm OS for palm handheld computer are single user single tasking OS

· Single user, multi tasking operating system: the single user, multitasking operating system allows a single user to execute multi programs at a same time. For example, a user can perform different tasks such as making calculation in excel sheet, printing a word document and download a file from the internet at the same time .

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Defination of OS(operating system) and its concepts

What do you mean by operating system? Definition : An operating system is a program that act as an interface between the user of a computer and the Computer hardware. Operating system is a first program that gets loaded into the memory through a process called booting. Concepts of operating system : · The purpose of operating system is to provide an environment in which a user can execute program in a convenient and efficient manner. · Operating system is an integrated set of program that ma...

Multi user Operating System

Multi user operating system · In a multi-user operating system, multiple number of user can access different resources of a computer at a same time. · The access is provided using a network that consists of various personal computer attached to a mainframe computer system. diagram of multi -user operating system · The various personal computer can send and receive information to mainframe computer system. · The example of multi-user OS are UNIX, windows 2000,novell netware. sing...

Batch Processing Operating System

Batch processing system · Batch processing is one of the oldest method of running the programs · The computer in the past were very large in size and their I/O devices were very different from those that are used today. The job processing was not interactive as it is today. · The user did not interact directly with computer system. · The process scheduling , memory management, file management and I/Omanagement functions are quite simple in batch processing system 1. Process scheduling (i.e. allocation strategy for a processor is typically in order of their arrival i.e. first come first served(FCFS)basis. 2. Memory management is done by divi...

Scheduler

Scheduler Scheduling Objectives Here, are important objectives of Process scheduling Maximize the number of interactive users within acceptable response times. Achieve a balance between response and utilization. Avoid indefinite postponement and enforce priorities. It also should give reference to the processes holding the key resources Process Scheduling handles the selection of a process for the processor on the basis of a scheduling algorithm and also the removal of a process from the processor. It is an important part of multiprogramming in operating system. Process scheduling involves short-term scheduling, medium-term scheduling and long-term scheduling. Details about these are given as follows − Long-Term Scheduling Long-term scheduling involves selecting the processes from the storage pool in the secondary memory and loading them into the ready queue in the main memory for execution. This is handled by the long-term scheduler or job scheduler. The long-term s...

Time Sharing System and its Requirements

Time sharing system · Time sharing refers to the allocation of computer resources in a time dependent fashion to several program simultaneously · A time sharing system has many user terminals that are connected to same computer simultaneously. Using these terminal, different users can work on a system at the same time · Thus, it uses multi programming with a special CPU scheduling among all the last one, and then again beginning from the first one · In time sharing system, the CPU time is divided among all the users on schedule basis. · It release the CPU under any of the following three conditions: 1. When the allotted time slice expires. 2. ...

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