Core Concepts In Computer Science - Operating Systems

CORE CONCEPTS IN COMPUTER SCIENCE – OPERATING SYSTEMS
English | 28 pages | pdf, epub, azw3 | 2.6 MB

Description:
INTRODUCTION

An operating system is a program that allows other programs to run on a computer. The operating system of a computer is the most important program. It manages both hardware and software resources. The operating system is responsible for everything, from controlling and allocating memory to receiving input from external devices to transmitting it to computers displays. They manage files on computers hard drives and control peripherals like scanners and printers.

Even more work is required for the operating system of large computer systems. These operating systems monitor multiple programs and users to ensure that everything runs smoothly, regardless of the fact that many programs and devices are being used simultaneously. Security is also a crucial role for an operating system. It prevents unauthorized users from accessing the computer systems. Multiuser, multitasking and multitasking are all possible. Real-time operating systems can also be used. Multiuser operating systems allow multiple users to simultaneously run programs. This type of operating system can be used by a small number of people or many. Some operating systems allow multiple users to run programs simultaneously.

OPERATING SYTEMS BASICS

Operating system (OS), is software that manages and maintains software resources and provides services to other programs. Time-sharing operating system schedules tasks to optimize the system’s use. It may also include accounting software that allocates processor time, mass storage, printing, or other resources.

Operating system (OS), program which manages the computer’s resources and allocates them among other programs. The typical resources are the central processing unit (CPU), file storage, input/output devices (I/O), and network connections. Scheduling resource usage is one of the most important management tasks. This helps to avoid conflict and inter-program interference. Operating systems run indefinitely, and only terminate when the computer is turned off. This is unlike most programs that complete tasks and then terminate.

CLUSTERED SOFTWARE

A clustered system, which combines multiple CPUs, is another type of multiprocessor systems. Clustered systems are different from multiprocessor systems as they have two or more systems (or nodes) that are joined together. These systems can be loosely coupled. One node can be a single processor or multicore system.

Clustering is often used to provide high availability service. This means that service will continue even when one or more of the systems fails. We generally achieve high availability by increasing the level of redundancy within the system. Cluster software is run on each node. Each node can monitor the other (over the Internet). The monitoring machine can assume ownership of the storage device and restart any applications that are running on the failing machine if the monitored machine crashes.