Busisness

In: Computers and Technology

Submitted By carline
Words 960
Pages 4
Operating Systems Concepts

Contents Introduction 3

Virtual Memory 3

First In First Out 4

Least Recently Used 5

References 6

Introduction
As we gain a better understanding of how computers and their operating systems work, we are able to better grasp how they handle the execution of programs. As we first learn to use computers we really do not think about the things that programs need in order to run, such as memory, as long as everything works. Although as we advance our knowledge of how such things operate, we begin to understand the mechanics of such things as physical and virtual memory.
Virtual Memory Normally when we think of memory, in terms of computers, we generally tend to think about things like the hard drive or the RAM. These items are generally used in the storage of programs, documents and multimedia, however when it comes to running a program their functions are slightly altered. Programs that are executed to run on a computer require a certain amount of memory in order to run. As modern operating systems have become capable of running multiple processes, or programs, with limited resources of memory, operating systems need a way to manage these resources. This is referred to as memory management, which allocates the memory resources as they are needed. When a memory manager has the capability to allocate the memory resources to multiple programs this is known as virtual memory. Virtual memory is a technique that is used to give the illusion of addition memory when a system is low on physical memory, the manager would divide the available space into pages and then stores its contents in mass storage. When paging is used, the processor divides the linear address space into fixed-size pages that can be mapped into physical memory and/or disk storage. When a program or task references a logical address in…...

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