Robust performance in hybrid-memory cooperative caches.

•Our object placement policy (RaCC) manages cooperative caches based on DRAM+PCM.•RaCC ranks/migrates/replaces objects in DRAM+PCM to improve the cache’s performance.•We model and evaluate PRESS and Memcached in hybrid and non-hybrid memory systems.•Storage device; memory performance; row-buffer+cache hit ratios affect performance.•RaCC presents the most robust performance without increasing energy consumption.