what is LRU| Least Recently Used page replacement algorithm in OS in urdu
In this lecture we will learn about LRU page replacement algorithm
Least Recently Used (LRU) algorithm is a page replacement technique used for memory management. According to this method, the page which is least recently used is replaced. Therefore, in memory, any page that has been unused for a longer period of time than the others is replaced.
The not recently used (NRU) page replacement algorithm is an algorithm that favours keeping pages in memory that have been recently used. This algorithm works on the following principle: when a page is referenced, a referenced bit is set for that page, marking it as referenced.
What is the least frequently used page replacement algorithm in OS?
LFU is one such page replacement policy in which the least frequently used pages are replaced. If the frequency of pages is the same, then the page that has arrived first is replaced first.
What is least recently used paging?
Least Recently Used (LRU) algorithm is a page replacement technique used for memory management. According to this method, the page which is least recently used is replaced. Therefore, in memory, any page that has been unused for a longer period of time than the others is replaced.
Which is better LRU or optimal page replacement?
LRU (Least Recently Used)
When a page fault occurs, the page that has been least recently used is replaced. It requires additional data structures, such as a linked list or a priority queue, to maintain the order of page usage. The LRU algorithm provides better performance by minimizing the number of page faults.
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