Explain Not recently used page replacement algorithm, Computer Engineering

Assignment Help:

Not Recently Used Page Replacement Algorithm

The not recently used abbreviated as NRU page replacement algorithm works on the subsequent principle: while a page is referenced, a referenced bit is set for that page, marking it as referenced. Likewise, while a page is modified (written to), a modified bit is set.  At a specific fixed time interval, the clock interrupt triggers and clears the referenced bit of all the pages, thus only pages referenced in the current clock interval are marked with a referenced bit. When a page requires to be replaced, the operating system categorizes the pages into four classes:

a) Class 0: not referenced, not modified 
b) Class 1: not referenced, modified 
c) Class 2: referenced, not modified 
d) Class 3: referenced, modified.

The NRU (Not recently used) algorithm picks a random page from the lowest category for removal. 


Related Discussions:- Explain Not recently used page replacement algorithm

How did you find web server related issues, Using Web resource monitors we ...

Using Web resource monitors we can search the performance of web servers. Using these monitors we can examine throughput on the web server, number of hits per second that happened

Vertical alignment of fields one below the other, Which Command permits for...

Which Command permits for vertical alignment of fields one below the other. UNDER Command is used ofr vertical alignment.

Typicality of virtual addresses, The typicality of virtual addresses is tha...

The typicality of virtual addresses is that: They are longer than physical addresses because total addressed memory in virtual memory is more than actual physical memory.

Technology impact on job design - information system, Technology impact on ...

Technology impact on job design - Information System The implementation of technology into work has had a significant impact on the types and content of job that are now avail

Local minima - sigmoid units, Local minima - sigmoid units: Alternativ...

Local minima - sigmoid units: Alternatively in addition to getting over some local minima where the gradient is constant in one direction or adding momentum will increase the

Artificial neural networks, Artificial Neural Networks: However imagin...

Artificial Neural Networks: However imagine now in this example as the inputs to our function were arrays of pixels and there actually taken from photographs of vehicles such

Internal structure of agents - artificial intelligence, Internal Structure ...

Internal Structure of Agents: We have looked at agents in terms of their external influences and behaviors: they put in from the surroundings and perform rational actions to a

Naïve bayes algorithm for text classification, Assignment 3: Naïve Bayes al...

Assignment 3: Naïve Bayes algorithm for text classification. First part: In this assignment, we will redo the task of classifying documents (assignment 2) using the same R

Extjs, tell some thing about htmleditor in extjs whether it contains attach...

tell some thing about htmleditor in extjs whether it contains attachment button or not

What is binary search, Binary Search: Search a sorted array by repeatedly i...

Binary Search: Search a sorted array by repeatedly in-between the search interval in half. Start with an interval covering the entire array. If the value of the search key is less

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