NDLI: In or out?: putting write barriers in their place

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In or out?: putting write barriers in their place

In or out?: putting write barriers in their place

Content Provider	ACM Digital Library
Author	Blackburn, Stephen M McKinley, Kathryn S.
Abstract	In many garbage collected systems, the mutator performs a write barrier for every pointer update. Using generational garbage collectors, we study in depth three code placement options for remembered-set write barriers: inlined, out-of-line, and partially inlined (fast path inlined, slow path out-of-line). The fast path determines if the collector needs to remember thepointer update. The slow path records the pointer in a list when necessary. Efficient implementations minimize the instructions on the fast path, and record few pointers (from 0.16 to 3% of pointer stores in our benchmarks). We find the mutator performs best with a partially inlined barrier, by a modest 1.5% on average over full inlining.We also study the compilation cost of write-barrier code placement. We find that partial inlining reduces the compilation cost by 20 to 25% compared to full inlining. In the context of just-in-time compilation, the application is exposed to compiler activity. Regardless of the level of compiler activity, partial inlining consistently gives a total running time performance advantage over full inlining on the benchmarks. When the compiler optimizes all application methods on demand and compiler load is highest, partial inlining improves total performance on average by 10.2%, and up to 18.5%.
Starting Page	175
Ending Page	184
Page Count	10
File Format	PDF
ISBN	1581135394
DOI	10.1145/512429.512452
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2002-06-20
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Write barriers Java Copying collection Generational collection
Content Type	Text
Resource Type	Article

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