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

Advntages of parallel processing oversequential computation, Advntages of p...

Advntages of parallel processing oversequential computation Parallel computing has the following benefits over sequential computing: i)    Accumulate time ii)   Solves b

Sem 4, Which are the subject of sem 4?

Which are the subject of sem 4?

Convert following decimal numbers into 9s & 10s complement, Q. Convert the ...

Q. Convert the following decimal numbers into 9s & 10s complement: 1) 3654 2) 99 3) 18.293 Q. Convert the following binary numbers into 1s& 2s complement: 1) 1101

Important points of simulations, Important points of simulations In thi...

Important points of simulations In this simulation it is essential to consider: (1)  What and how data is gathered (2)  How simulation is done (3)  How system would wo

What are benefits to businesses by e-commerce over extranets, What are adva...

What are advantages and benefits to businesses by e-commerce over extranets? The advantages and benefits to businesses comprise: Less Paperwork: along with documents and bus

Define side tone is essential in telephone communication, A certain amount ...

A certain amount of side tone is essential in telephone communication. Ans: It is true that a specific amount of side tone is necessary in telephone communication.

Define register file, Define register file. All general purpose registe...

Define register file. All general purpose registers are combined into a one block called the register file.

Determine the indicator variables in a random forest, Given a dataset with ...

Given a dataset with 1000 rows and 25 predictors labeled x1, x2, ...,x25 to classify into two classes {a, b}. Consider the small random forest with 3 trees and one split in each tr

Difference between data warehousing and data mining, What is the difference...

What is the difference between data warehousing and data mining? The dissimilarity between data warehousing and data mining: Data warehousing seems to the data storage wh

Differentiate between EPROM and EEPROM, Differentiate between EPROM and EEP...

Differentiate between EPROM and EEPROM. EPROM: The meaning of this term is Erasable PROM. This can be reprogrammed through first erasing the existing program. EPROM uses N-MO

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