"Zero-Copy In-Memory Cache Abstraction: Leveraging Rust's robust type system, the in-memory cache in foyer achieves a better performance with zero-copy abstraction." - what does this actually mean in practice?
CacheLib requires entries to be copied to the CacheLib managed memory when it's inserted. It simplified some design trade-offs, but may affect the overall throughput when in-memory cache is involved more than nvm cache. FYI: https://cachelib.org/docs/Cache_Library_User_Guides/Write_da...
Foyer only requries entries to be serialized/deserialized when writing/reading from disk. The in-memory cache doesn't force a deep memory copy.