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Content Provider | ACM Digital Library |
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Author | Wang, Guanhua Ge, Zhiguo Chen, Wenzhi Yao, Yuan Zhang, Naxin Mitra, Tulika |
Abstract | As we enter the era of many-core, providing the shared memory abstraction through cache coherence has become progressively difficult. The de-facto standard directory-based cache coherence has been extensively studied; but it does not scale well with increasing core count. Timestamp-based hardware coherence protocols introduced recently offer an attractive alternative solution. In this paper, we propose a timestamp-based coherence protocol, called TC-Release++, that addresses the scalability issues of efficiently supporting cache coherence in large-scale systems. Our approach is inspired by TC-Weak, a recently proposed timestamp-based coherence protocol targeting GPU architectures. We first design TC-Release coherence in an attempt to straightforwardly port TC-Weak to general-purpose many-cores. But re-purposing TC-Weak for general-purpose many-core architectures is challenging due to significant differences both in architecture and the programming model. Indeed the performance of TC-Release turns out to be worse than conventional directory coherence protocols. We overcome the limitations and overheads of TC-Release by introducing simple hardware support to eliminate frequent memory stalls, and an optimized life-time prediction mechanism to improve cache performance. The resulting optimized coherence protocol TC-Release++ is highly scalable (overhead for coherence per last-level cache line scales logarithmically with core count as opposed to linearly for directory coherence) and shows better execution time (3.0%) and comparable network traffic (within 1.3%) relative to the baseline MESI directory coherence protocol. |
Starting Page | 1 |
Ending Page | 13 |
Page Count | 13 |
File Format | |
ISBN | 9781450343619 |
DOI | 10.1145/2925426.2926270 |
Language | English |
Publisher | Association for Computing Machinery (ACM) |
Publisher Date | 2016-06-01 |
Publisher Place | New York |
Access Restriction | Subscribed |
Content Type | Text |
Resource Type | Article |
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