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

Explain the exit (status) function, Explain the Exit (status) Function  ...

Explain the Exit (status) Function  Exit function causes the calling process to be terminated. Actually, all file descriptors are immediately closed but the process is   not

Define semaphore, Define semaphore A semaphore is a protected abstract ...

Define semaphore A semaphore is a protected abstract or variable data type that constitutes the classic method for restricting access to shared resources like shared memory in

Memory management, with aid of diagram describe 2 types of fixed partition ...

with aid of diagram describe 2 types of fixed partition allocation used in operating system

How can a user program disturb the normal operation, How can a user program...

How can a user program disturb the normal operation of the system? a) Issuing illegal I/O operation. b) By accessing memory locations within the OS itself. c) Refusing to

Naming scheme for servers in an enterprise, Problem: Within a corporate...

Problem: Within a corporate environment, there are usually many servers located across various departments. Naming of servers is often a tedious task. In many circumstances, w

Define page fault, Page fault is a trap to the software gained by the har...

Page fault is a trap to the software gained by the hardware when a process accesses a page that is goes in the virtual address space, but not added in physical memory. In the har

Processes, draw a state diagram showing the transissions of a process from ...

draw a state diagram showing the transissions of a process from creation to termination

Explain the circumstances under which os use mutexes, Q. Give the reasons ...

Q. Give the reasons why Windows XP, Solaris and Linux implement multiple locking mechanisms. Explain the circumstances under which they use mutexes, spinlocks, semaphores, adaptiv

Explain the overlay structured program, Overlay structured program: A p...

Overlay structured program: A program consisting of overlays is referred as overlay structured program in which an overlay is a part of program which has similar load origin as

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