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  1. Proceedings of the 3rd international symposium on Memory management (ISMM '02)
  2. In or out?: putting write barriers in their place
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Applying priorities to memory allocation
Understanding the connectivity of heap objects
Thread-local heaps for Java
An algorithm for parallel incremental compaction
Adaptive caching for demand prepaging
Accurate garbage collection in an uncooperative environment
Reducing pause time of conservative collectors
Visualising the train garbage collector
Heap architectures for concurrent languages using message passing
Using passive object garbage collection algorithms for garbage collection of active objects
An adaptive, region-based allocator for java
Software caching vs. prefetching
Automated discovery of scoped memory regions for real-time Java
Estimating the impact of heap liveness information on space consumption in Java
Dynamic memory management for programmable devices
Mostly lock-free malloc
In or out?: putting write barriers in their place

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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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