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A Two-Level Cache Aware Adaptive Data Replication Mechanism for Shared LLC

Qianqian WU, Zhenzhou JI

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Summary :

The shared last level cache (SLLC) in tile chip multiprocessors (TCMP) provides a low off-chip miss rate, but it causes a long on-chip access latency. In the two-level cache hierarchy, data replication stores replicas of L1 victims in the local LLC (L2 cache) to obtain a short local LLC access latency on the next accesses. Many data replication mechanisms have been proposed, but they do not consider both L1 victim reuse behaviors and LLC replica reception capability. They either produce many useless replicas or increase LLC pressure, which limits the improvement of system performance. In this paper, we propose a two-level cache aware adaptive data replication mechanism (TCDR), which controls replication based on both L1 victim reuse behaviors prediction and LLC replica reception capability monitoring. TCDR not only increases the accuracy of L1 replica selection, but also avoids the pressure of replication on LLC. The results show that TCDR improves the system performance with reasonable hardware overhead.

Publication
IEICE TRANSACTIONS on Information Vol.E105-D No.7 pp.1320-1324
Publication Date
2022/07/01
Publicized
2022/03/25
Online ISSN
1745-1361
DOI
10.1587/transinf.2022EDL8002
Type of Manuscript
LETTER
Category
Computer System

Authors

Qianqian WU
  Harbin Institute of Technology
Zhenzhou JI
  Harbin Institute of Technology

Keyword