What are the differences between FIFO and LRU caching algorithms?

What are the differences between FIFO and LRU caching algorithms?

FIFO (First In, First Out) removes the oldest item in the cache, while LRU (Least Recently Used) removes the least recently accessed item.

Can you explain how FIFO works in more detail?

Sure! In FIFO, the cache maintains a queue of items. When the cache reaches its limit, the item that has been in the cache the longest is removed.

What about LRU? How does it keep track of usage?

LRU uses a data structure, often a linked list, to track the order of access. When an item is accessed, it moves to the front, and the least recently used item at the back is removed when needed.

Which algorithm is better for performance?

It depends on the use case. LRU is generally better for workloads with temporal locality, while FIFO can be simpler and faster in some scenarios.