What are the differences between LRU algorithms?

What are the differences between LRU algorithms?

LRU, or Least Recently Used, algorithms manage cache by evicting the least recently accessed items. There are several variations, such as the basic LRU, LRU-K, and LRU-2, each with unique mechanisms for tracking usage.

Can you explain how LRU-K works?

Sure! LRU-K keeps track of the last K accesses for each item in the cache. This allows it to make more informed decisions about which items to evict based on their access patterns.

What are the advantages of using LRU-2 over basic LRU?

LRU-2 improves upon basic LRU by considering the last two accesses, which helps in better predicting which items are likely to be used again soon, thus reducing cache misses.

Are there any scenarios where LRU might not be the best choice?

Yes, in cases with highly predictable access patterns or when the working set fits entirely in cache, simpler algorithms like FIFO or even random replacement might perform better.