What are the differences between LRU Cache and FIFO Cache?

What are the differences between LRU Cache and FIFO Cache?

LRU (Least Recently Used) Cache evicts the least recently accessed items, while FIFO (First In First Out) Cache evicts the oldest items.

Which one is more efficient for memory management?

LRU is generally more efficient for scenarios where access patterns are non-uniform, as it keeps frequently accessed items.

Can you give an example of when to use each?

Use LRU for applications like web browsers where recent items are more likely to be reused. FIFO is simpler and can be used in streaming applications.

What are the implementation complexities of both?

LRU requires more complex data structures like a hash map and a doubly linked list, while FIFO can be implemented with a simple queue.