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• W2164069834 abstract "Recent technology improvements allow multiprocessor designers to put some key components inside the processor chip, such as the memory controller and the network interface. In this paper, we exploit such an integration scale, presenting a new three-level directory architecture aimed at reducing the long L2 miss latencies and the memory overhead that characterize cc-NUMA machines and limit their scalability. The proposed architecture is based on the integration into the processor chip of the directory controller and a small first-level directory cache that stores precise information for the most recently referenced memory lines, as the means to reduce miss latencies. The second- and third-level directories are located near the main memory and they are only accessed when a directory entry for a certain memory line is not present in the first-level directory. This off-chip structure achieves the performance of a large and non-scalable full-map directory with a very significant reduction in the memory overhead. Using execution-driven simulations, we show that substantial latency reductions can be obtained by using the proposed directory architecture. Load, store and read-modify-write misses are significantly accelerated (latency reductions of more than 35% in some cases). These reductions translate into important improvements on the final application performance (reductions up to 20% in execution time)." @default.
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• W2164069834 date "2003-06-25" @default.
• W2164069834 modified "2023-09-22" @default.
• W2164069834 title "Reducing the latency of L2 misses in shared-memory multiprocessors through on-chip directory integration" @default.
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• W2164069834 doi "https://doi.org/10.1109/empdp.2002.994312" @default.
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