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Page Replacement Algorithm in Operating System Video Lecture | Crash Course for UGC NET Computer science

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1. What is a page replacement algorithm in operating systems?
Ans. A page replacement algorithm is a method used by operating systems to decide which memory pages to swap out of physical memory (RAM) and onto the disk when a page fault occurs.
2. What is the purpose of a page replacement algorithm?
Ans. The main purpose of a page replacement algorithm is to optimize memory usage by efficiently managing the limited physical memory available to the system.
3. What are some popular page replacement algorithms used in operating systems?
Ans. Some popular page replacement algorithms include FIFO (First-In-First-Out), LRU (Least Recently Used), Optimal, and Clock algorithms.
4. How does the FIFO page replacement algorithm work?
Ans. In the FIFO page replacement algorithm, the page that has been in memory the longest is replaced when a page fault occurs. It follows a queue-like structure where the page that was brought into memory first is the first to be replaced.
5. How does the LRU page replacement algorithm work?
Ans. In the LRU (Least Recently Used) page replacement algorithm, the page that has not been accessed for the longest period of time is replaced when a page fault occurs. It keeps track of the order in which pages are accessed and replaces the least recently used page.
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