Improvements in semiconductor nanotechnology made chip multiprocessors the reference architecture for high-performance microprocessors. CMPs usually adopt large Last-Level Caches (LLC) shared among cores and private L1 caches, whose performances depend on the wire-delay dominated response time of LLC. NUCA (NonUniform Cache Architecture) caches represent a viable solution for tolerating wire-delay effects. In this article, we present Re-NUCA, a NUCA cache that exploits replication of blocks inside the LLC to avoid performance limitations of D-NUCA caches due to conflicting access to shared data. Results show that a Re-NUCA LLC permits to improve performances of more than 5% on average, and up to 15% for applications that strongly suffer from conflicting access to shared data, while reducing network traffic and power consumption with respect to D-NUCA caches. Besides, it outperforms different S-NUCA schemes optimized with victim replication.

Exploiting Replication to Improve Performances of NUCA-Based CMP Systems

FOGLIA, PIERFRANCESCO;
2014

Abstract

Improvements in semiconductor nanotechnology made chip multiprocessors the reference architecture for high-performance microprocessors. CMPs usually adopt large Last-Level Caches (LLC) shared among cores and private L1 caches, whose performances depend on the wire-delay dominated response time of LLC. NUCA (NonUniform Cache Architecture) caches represent a viable solution for tolerating wire-delay effects. In this article, we present Re-NUCA, a NUCA cache that exploits replication of blocks inside the LLC to avoid performance limitations of D-NUCA caches due to conflicting access to shared data. Results show that a Re-NUCA LLC permits to improve performances of more than 5% on average, and up to 15% for applications that strongly suffer from conflicting access to shared data, while reducing network traffic and power consumption with respect to D-NUCA caches. Besides, it outperforms different S-NUCA schemes optimized with victim replication.
Foglia, Pierfrancesco; M., Solinas
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/272135
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