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

Explain about multidimensional features present in olap, Multidimensional s...

Multidimensional support is very necessary if we are to contain multiple hierarchies in our data analysis. Multidimensional feature permits a user to examine business and organizat

Differentiate between http and ftp, Differentiate between http and ftp. ...

Differentiate between http and ftp. HTTP and FTP were developed to make Internet transmission better. FTP is utilized to exchange files among computer accounts, to transfer

Explain about the prepurchase interaction activity, Explain about the Prepu...

Explain about the Prepurchase Interaction activity. Prepurchase Interaction: This interaction for consumers comprises three activities: • Product or service search and di

Define the advantages of assembly language., Highlight the advantages of as...

Highlight the advantages of assembly language. The benefits of assembly language program would be Reduced errors Faster translation times Changes could be made fas

Explain data mining, Data Mining is an analytic method designed to explore...

Data Mining is an analytic method designed to explore data and then to validate the findings by applying the detected patterns to latest subsets of data.  The ultimate goal of dat

Luminous Jewels - The Polishing Game, Byteland county is very famous for lu...

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

Background and foreground colors can be interchanged, Background and foregr...

Background and foreground colors can be interchanged using the command?? Format Inverse command.

What a header script can specify in cgi, A header in CGI script can specify...

A header in CGI script can specify? A header into CGI script can give format of document and New location of perticular the document.

Digital logic, write a short note on the tri state ttl inverter

write a short note on the tri state ttl inverter

What is minimum spanning tree, Minimum Spanning Tree: Given a weighted gra...

Minimum Spanning Tree: Given a weighted graph G, it is often desired to make a spanning tree T for G, like the sum of weights of the edges in T is the least. Like tree is known 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