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The memory wall continues to limit the performance of modern out-of-order (OOO) processors, despite the expensive provisioning of large multi-level caches and advancements in memory prefetching. In this paper, we put forth an important observation that the memory wall is not monolithic, but is constituted of many latency walls arising due to the latency of each tier of cache/memory. Our results show that even though level-1 (L1) data cache latency is nearly 40X lower than main memory latency, mitigating this latency offers a very similar performance opportunity as the more widely studied, main memory latency.
Shukla et al. (Tue,) studied this question.
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