give the types of operating system and explain
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Answer:
An Operating System performs all the basic tasks like managing file,process, and memory.
Following are some of the most widely used types of Operating system.
Simple Batch System
Multiprogramming Batch System
Multiprocessor System
Desktop System
Distributed Operating System
Clustered System
Realtime Operating System
Handheld System
Simple Batch Systems
In this type of system, there is no direct interaction between user and the computer.
The user has to submit a job (written on cards or tape) to a computer operator.
Then computer operator places a batch of several jobs on an input device.
Multiprogramming Batch Systems
In this the operating system picks up and begins to execute one of the jobs from memory.
Once this job needs an I/O operation operating system switches to another job (CPU and OS always busy).
Jobs in the memory are always less than the number of jobs on disk(Job Pool).
Multiprocessor Systems
A Multiprocessor system consists of several processors that share a common physical memory. Multiprocessor system provides higher computing power and speed. In multiprocessor system all processors operate under single operating system. Multiplicity of the processors and how they do act together are transparent to the others.
Desktop Systems
Earlier, CPUs and PCs lacked the features needed to protect an operating system from user programs. PC operating systems therefore were neither multiuser nor multitasking. However, the goals of these operating systems have changed with time; instead of maximizing CPU and peripheral utilization, the systems opt for maximizing user convenience and responsiveness.
Distributed Operating System
The motivation behind developing distributed operating systems is the availability of powerful and inexpensive microprocessors and advances in communication technology.
Peer-to-Peer Systems
The growth of computer networks - especially the Internet and World Wide Web (WWW) – has had a profound influence on the recent development of operating systems. When PCs were introduced in the 1970s, they were designed for personal use and were generally considered standalone computers.
Clustered Systems
Like parallel systems, clustered systems gather together multiple CPUs to accomplish computational work.
Clustered systems differ from parallel systems, however, in that they are composed of two or more individual systems coupled together.
Real Time Operating System
It is defined as an operating system known to give maximum time for each of the critical operations that it performs, like OS calls and interrupt handling
Handheld Systems
Handheld systems include Personal Digital Assistants(PDAs), such as Palm-Pilots or Cellular Telephones with connectivity to a network such as the Internet. They are usually of limited size due to which most handheld devices have a small amount of memory, include slow processors, and feature small display screens.
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