Protection and Security in Operating System

Protection and security in Operating can improve reliability by detecting latent errors at the interfaces between component subsystems. Early detection of interface errors can often prevent contamination of a healthy subsystem by another subsystem that is malfunctioning. Furthermore, an unprotected resource cannot defend against use (or misuse) by an unauthorized or incompetent user. A protection-oriented … Read more

Storage Management in Operating System

The operating system provides a uniform, logical view of information storage. The operating system abstracts from the physical properties of its storage devices to define a logical storage unit, the file. The operating system maps files onto physical media and accesses these files via the storage devices File-System Management File management is one of the … Read more

Clustered Systems in Operating System

Clustered system, which gathers together multiple CPUs they are composed of two or more individual systems—or nodes—joined together. Such systems are considered loosely coupled. Each node may be a single processor system or a multicore system. We should note that the definition of clustered is not concrete; many commercial packages wrestle to define a clustered … Read more

Multiprocessor Systems

multiprocessor systems (also known as parallel systems or multicore systems) have begun to dominate the landscape of computing. Such systems have two or more processors in close communication, sharing the computer bus and sometimes the clock, memory, and peripheral devices. Multiprocessor systems first appeared prominently appeared in servers and have since migrated to desktop and … Read more

Single-Processor Systems

On a single processor system, there is one main CPU capable of executing a general-purpose instruction set, including instructions from user processes. Almost all single processor systems have other special-purpose processors as well. They may come in the form of device-specific processors, such as disk, keyboard, and graphics controllers; or, on mainframes, they may come … Read more

Operating system

An operating system is a program that manages a computer’s hardware. It also provides a basis for application programs and acts as an intermediary between the computer user and the computer hardware. What Operating Systems Do ? The hardware—the central processing unit (CPU), the memory, and the input/output (I/O) devices—provides the basic computing resources for … Read more