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<p><b>Abstract</b>—In this paper, we present a high performance cache structure with a hardware prefetching mechanism that enhances exploitation of spatial and temporal locality. The proposed cache, which we call a Selective-Mode Intelligent (SMI) cache, consists of three parts: a direct-mapped cache with a small block size, a fully associative spatial buffer with a large block size, and a hardware prefetching unit. Temporal locality is exploited by selectively moving small blocks into the direct-mapped cache after monitoring their activity in the spatial buffer for a time period. Spatial locality is enhanced by intelligently prefetching a neighboring block when a spatial buffer hit occurs. The overhead of this prefetching operation is shown to be negligible. We also show that the prefetch operation is highly accurate: Over 90 percent of all prefetches generated are for blocks that are subsequently accessed. Our results show that the system enables the cache size to be reduced by a factor of four to eight relative to a conventional direct-mapped cache while maintaining similar performance. Also, the SMI cache can reduce the miss ratio by around 20 percent and the average memory access time by 10 percent, compared with a victim-buffer cache configuration.</p>
Memory hierarchy, dual data cache, temporal locality, spatial locality, prefetching.

S. Kim, S. Jeong, C. Weems and J. Lee, "An Intelligent Cache System with Hardware Prefetching for High Performance," in IEEE Transactions on Computers, vol. 52, no. , pp. 607-616, 2003.
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