Exploiting Application-Level Information to Reduce Memory Bandwidth Consumption

As processors continue to deliver higher levels of performance and as memory latency tolerance techniques become widespread to address the increasing cost of accessing memory, memory bandwidth will emerge as a major performance bottleneck. Rather than rely solely on wider and faster memories to address memory bandwidth shortages, an alternative is to use existing memory bandwidth more efficiently. A promising approach is hardware-based selective subblocking [14, 2]. In this technique, hardware predictors track the portions of cache blocks that are referenced by the processor. On a cache miss, the predictors are consulted and only previously referenced portions are fetched into the cache, thus conserving memory bandwidth