ObjecTier: Non-Invasively Boosting Memory Tiering Performance

Recent research has developed page-based memory-tiering systems that place hot pages in fast tiers and cold pages in slower, more capacious tiers. However, applications place many objects together within pages, and most pages contain some objects that are hot and some that are cold. Our simulations of a key-value workload confirm this; even the hottest pages in the fast tier can contain 50% cold data.