Which page replacement algorithm replaces the page that has not been used for the longest period of time?

Question

BlackTom AI · Accepted Answer

Question restatement: Which page replacement algorithm replaces the page that has not been used for the longest period of time?

Option a: Optimal Page Replacement. This algorithm indeed replaces the page that will not be used for the longest future interval, meaning it looks ahead to future references. While this yields the lowest possible page fault rate in theory, it is not feasible in real systems because it requires future knowledge of references. Therefore, although conceptually optimal, it does not describe a practical replacement policy.

Option b: Least Recently Used (LRU). This rule selects the page that has not been used for the longest time in the past, i.e., the one whose most recent use is oldest. LRU approximates the idea of “not used for the longest period of time” by tracking recency of accesses, and it aligns with common operating system implementations using counters or stacks to track usage.

Option c: Most Recently Used (MRU). MRU does the opposite: it replaces the most recently accessed page, under the belief that recently used pages may have short reuse distances. This is not the same as replacing the one not used for the longest time, and it tends to perform poorly in workloads with temporal locality.

Option d: First-In, First-Out (FIFO). FIFO evicts the oldest loaded page, regardless of how recently it has been used. It does not consider the recency of usage, so the page being oldest in memory is not necessarily the one unused for the longest span; thus it can evict frequently used pages depending on the access pattern.

Additional notes: The question emphasizes the longest period since last use, which directly matches the core idea of recency-based eviction. Understanding the distinction between recency (LRU) and age since load (FIFO) or future knowledge (Optimal) helps separate these choices. The MRU approach is a reversal of the recency concept and does not satisfy the given criterion.

Which page replacement algorithm replaces the page that has not been used for the longest period of time?Single choice

Similar Questions

In the optimal page replacement algorithm that we would like to have (the ideally optimal algorithm in theory) , when a page needs to be replaced because the memory is full, which of the following pages is chosen to be swapped out from memory to disk?

In FIFO page replacement algorithm, when a page must be replaced

Which page replacement algorithm replaces the page that has not been used for the longest period of time?

Which page replacement algorithm replaces the page that has not been used for the longest period of time?

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler