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Practical Off-chip Meta-data for Temporal Memory Streaming
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@MISC{Wenisch_practicaloff-chip,
author = {Thomas F. Wenisch and Michael Ferdman and Anastasia Ailamaki and Babak Falsafi and Andreas Moshovos},
title = {Practical Off-chip Meta-data for Temporal Memory Streaming},
year = {}
}
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Abstract
Prior research demonstrates that temporal memory streaming and related address-correlating prefetchers improve performance of commercial server workloads though increased memory level parallelism. Unfortunately, these prefetchers require large on-chip meta-data storage, making previously-proposed designs impractical. Hence, to improve practicality, researchers have sought ways to enable timely prefetch while locating meta-data entirely off-chip. Unfortunately, current solutions for off-chip meta-data increase memory traffic by over a factor of three. We observe three requirements to store meta-data off chip: minimal off-chip lookup latency, bandwidthefficient meta-data updates, and off-chip lookup amortized over many prefetches. In this work, we show: (1) minimal off-chip meta-data lookup latency can be achieved through a hardware-managed main memory hash table, (2) bandwidth-efficient updates can be performed through probabilistic sampling of meta-data updates, and (3) off-chip lookup costs can be amortized by organizing meta-data to allow a single lookup to yield long prefetch sequences. Using these techniques, we develop Sampled Temporal Memory Streaming (STMS), a practical address-correlating prefetcher that keeps predictor meta-data in main memory while achieving 90 % of the performance potential of idealized on-chip meta-data storage. 1.
Keyphrases
temporal memory streaming practical off-chip meta-data current solution main memory increased memory level parallelism minimal off-chip meta-data lookup latency meta-data update minimal off-chip lookup latency off-chip meta-data increase memory traffic commercial server workload practical address-correlating prefetcher hardware-managed main memory hash table large on-chip meta-data storage long prefetch sequence prior research performance potential probabilistic sampling previously-proposed design single lookup off-chip lookup timely prefetch off-chip lookup cost predictor meta-data sampled temporal memory streaming bandwidthefficient meta-data update many prefetches idealized on-chip meta-data storage related address-correlating prefetchers bandwidth-efficient update
