What are the different eviction policies in Memcached?

What are the different eviction policies in Memcached?

Memcached uses several eviction policies to manage memory. The most common ones are LRU (Least Recently Used), LRU-2, and FIFO (First In, First Out). Would you like to know more about how each one works?

Yes, can you explain LRU in detail?

LRU evicts the least recently used items first. It keeps track of the order in which items are accessed, so when memory is full, it removes the item that hasn't been used for the longest time.

What about FIFO? How does it differ from LRU?

FIFO evicts items in the order they were added, regardless of how often they are accessed. This can lead to less efficient memory usage compared to LRU, especially if older items are still frequently accessed.

Are there any other policies I should know about?

Yes, there's also LRU-2, which tracks the last two accesses to each item, providing a more nuanced approach than LRU. It can be more effective in certain scenarios.