NDLI: Automatic array inlining in java virtual machines

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Automatic array inlining in java virtual machines

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Automatic array inlining in java virtual machines

Content Provider	ACM Digital Library
Author	Wimmer, Christian Mössenböck, Hanspeter
Abstract	Array inlining expands the concepts of object inlining to arrays. Groups of objects and arrays that reference each other are placed consecutively in memory so that their relative offsets are fixed, i.e. they are colocated. This allows memory loads to be replaced by address arithmetic, which reduces the costs of field and array accesses. We implemented this optimization for Sun Microsystems' Java HotSpot VM. The optimization is performed automatically and requires no actions on the part of the programmer. Arrays are frequently used for the implementation of dynamic data structures. Therefore, the length of arrays often varies, and fields referencing such arrays have to be changed whenever the array is reallocated. We present an efficient code pattern that detects these changes and allows the optimized access of such array fields. It is integrated into the array bounds check. We also claim that inlining array element objects into an array is not possible without a global data flow analysis. The evaluation shows that our dynamic approach can optimize frequently accessed fields with a reasonable low compilation and analysis overhead. The peak performance of SPECjvm98 is improved by 10% on average, with a maximum of 25%.
Starting Page	14
Ending Page	23
Page Count	10
File Format	PDF
ISBN	9781595939784
DOI	10.1145/1356058.1356061
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-04-06
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Garbage collection Java Just-in-time compilation Performance Array inlining Object inlining Optimization
Content Type	Text
Resource Type	Article

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