Distance-aware L2 cache organizations for scalable multiprocessor systems

In this paper, we suggest an LRU/distance-aware combined second-level(L2) cache for scalable CC-NUMA multiprocessors, which is composed of a traditional LRU cache and an additional distance-aware cache that maintains the distance information of individual cache block for replacement purposes. The LRU cache selects a victim using age information as it typically does, while the distance-aware cache does using distance information. Both work together to reduce effectively the overall distance the cache miss goes through by keeping long-distance blocks as well as recently used blocks. It has been observed that the proposed cache outperforms the traditional LRU cache by up to 28% in the execution time. It is also found to perform even better than an LRU cache of twice the size.