Why replacement algorithm is used in set associative mapping?

In the associative mapping, any block of main memory can go to any block of cache, so it has got the complete flexibility and we have to use proper replacement policy to replace a block from cache if the currently accessed block of main memory is not present in cache.

What are the four cache replacement algorithms?

Vakali describes four cache replacement algorithms HLRU, HSLRU, HMFU and HLFU. These four cache replacement algorithms are history-based variants of the LRU, Segmented LRU, Most Fre- quently Used (expels most frequently requested objects from the cache) and the LFU cache replacement algorithms.

What is 4 way set associative TLB?

Since TLB is 4 way set associative and can hold total 128 (2^7) page table entries, number of sets in cache = 2^7/4 = 2^5. So 5 bits are needed to address a set, and 15 (20 – 5) bits are needed for tag.

In which mapped No replacement algorithm is required?

The directly mapped cache no replacement algorithm is required. Explanation: The position of each block is pre-determined in the direct mapped cache, hence not need for replacement.

What is replacement algorithm in computer architecture?

In a computer operating system that uses paging for virtual memory management, page replacement algorithms decide which memory pages to page out, sometimes called swap out, or write to disk, when a page of memory needs to be allocated.

Why do we need replacement algorithm?

Page replacement algorithms are an important part of virtual memory management and it helps the OS to decide which memory page can be moved out, making space for the currently needed page. However, the ultimate objective of all page replacement algorithms is to reduce the number of page faults.

What is replacement algorithms in computer architecture?

What cache mapping function does not require a replacement algorithm?

In direct mapping, There is no need of any replacement algorithm. This is because a main memory block can map only to a particular line of the cache.

Which cache mapping function does not require a replacement algorithm Mcq?

Which of the following is not a write policy to avoid cache coherence?

6. Which of the following is not a write policy to avoid Cache Coherence? Explanation: There is no policy which is called as the write within policy.