Specializing Cache Structures for High Performance and Energy Conservation in Embedded Systems

Increasingly tight energy design goals require processor architects to rethink the organizational structure of microarchitectural resources. We examine a new multilateral cache organization, replacing a conventional data cache with a set of smaller region caches that significantly reduces energy consumption with little performance impact. This is achieved by tailoring the cache resources to the specific reference characteristics of each application. In applications with small heap footprints, we save about 85% of the total cache energy. In the remaining applications, we employ a small cache for frequently accessed heap data and a larger cache for low locality data, achieving an energy savings of 80%.