NDLI: Pointy: a hybrid pointer prefetcher for managed runtime systems

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Pointy: a hybrid pointer prefetcher for managed runtime systems

Content Provider	ACM Digital Library
Author	Moshovos, Andreas Soares, Livio Burcea, Ioana
Abstract	This work proposes Pointy, a software assisted hardware pointer prefetcher for Java applications. Pointy exploits the strengths of both software and hardware. Its runtime software component communicates points-to relationships between objects to the underlying hardware. This points-to information is maintained and tracked in any managed runtime that implements automatic garbage collection. Pointy stores the object connectivity information in a separate hardware structure and uses it to generate timely pointer prefetches. To achieve a low-cost hardware implementation, Pointy spills the object metadata to the conventional memory hierarchy and retrieves it only when needed. Taking advantage of its hybrid design, Pointy can selectively communicate points-to metadata to the hardware based on class profiling that is readily available at the runtime level, while impractical to extract at the hardware level. Experimental results show that Pointy improves performance for pointer intensive benchmarks even in the presence of conventional prefetchers. When used in conjunction with traditional prefetchers, such as striding and next line, Pointy improves application performance by 53% for SpecJBB 2005 and by 72% on average, which represents a speedup of 19% and 18%, respectively, compared to traditional prefetchers.
Starting Page	97
Ending Page	106
Page Count	10
File Format	PDF
ISBN	9781450311823
DOI	10.1145/2370816.2370832
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-09-19
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Pointer prefetching Hybrid software-hardware prefetching Runtime systems Computer architecture
Content Type	Text
Resource Type	Article

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