Explain optimal page replacement, Operating System

Assignment Help:

Optimal page replacement

An optimal page replacement algorithm has the least page fault rate of all algorithms. The algorithm states that a 'replace the page that will not be used for the longest period of time'.

The drawback of this algorithm is that it is very hard to execute as it requires future knowledge of the reference string.

Example Consider the reference string 1,2,3,4,3,1. Here 1,2,3 are inserted as normal however when 4 comes we replace 2 as it isn't used again.

 


Related Discussions:- Explain optimal page replacement

What is segmentation?, SEGMENTATION In a memory management system that ...

SEGMENTATION In a memory management system that is properly a programmer views a program to be collection of program components called as segments . Every segment is a logical

Define program preemption, Define Program preemption The Forced de-allo...

Define Program preemption The Forced de-allocation of the CPU from a program which is executing on the CPU is known as Program preemption

What are the services provided by the operating systems, What are the servi...

What are the services provided by the operating systems?  Program Development It provides a variety of services and facilities, such as debuggers and editor, to help the

Define the os/2 threads code, Define the OS/2 threads code The sample p...

Define the OS/2 threads code The sample program in Listing is very similar to the NetWare example. OS/2 commands are substituted for the pseudocode commands controlling thread

Explain the reasons why an organisation fail to plan, Problem 1: (a) Wh...

Problem 1: (a) What are the likely benefits which an organisation may derive from the planning process? (b) Explain the main reasons why an organisation may fail to plan.

Define deadlock avoidance, Define deadlock avoidance. An alternative me...

Define deadlock avoidance. An alternative method for avoiding deadlocks is to need additional information about how resources are to be requested. Every request requires the sy

Total physical memory and total virtual memory , A practical task specified...

A practical task specified in the Study Guide, Computer architecture, was to record your computer's specifications. Submit the data you recorded, which will contain the following d

Define an assembly language, Define an assembly language  Assembly lan...

Define an assembly language  Assembly language stands for a Low level programming language

Operational management, explain the link between operations management and ...

explain the link between operations management and strategic planning of daily goods shop

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd