What are the different cache algorithms and how do they work?

What are the different cache algorithms and how do they work?

There are several cache algorithms, including LRU (Least Recently Used), FIFO (First In First Out), and LFU (Least Frequently Used). LRU evicts the least recently accessed items, FIFO removes the oldest items, and LFU removes the least frequently accessed items.

Can you explain how LRU works in more detail?

Sure! LRU keeps track of the order in which items are accessed. When a cache miss occurs, it removes the least recently used item to make space for the new one. This is often implemented using a linked list or a hash map.

What are the advantages of using LFU over LRU?

LFU is beneficial when certain items are accessed much more frequently than others, as it prioritizes keeping those items in the cache. This can lead to better performance in scenarios with stable access patterns.

Are there any hybrid algorithms that combine these methods?

Yes, hybrid algorithms like LRU-K combine LRU with frequency tracking, allowing for more nuanced eviction strategies based on both recency and frequency of access.