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  1. Proceedings of the 2012 international symposium on Memory Management (ISMM '12)
  2. Barriers reconsidered, friendlier still!
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Memory management for many-core processors with software configurable locality policies
Barriers reconsidered, friendlier still!
Down for the count? Getting reference counting back in the ring
A generalized theory of collaborative caching
The myrmics memory allocator: hierarchical,message-passing allocation for global address spaces
Eliminating read barriers through procrastination and cleanliness
The Collie: a wait-free compacting collector
Exploiting the structure of the constraint graph for efficient points-to analysis
GPUs as an opportunity for offloading garbage collection
Scalable concurrent and parallel mark
new Scala() instance of Java: a comparison of the memory behaviour of Java and Scala programs
Identifying the sources of cache misses in Java programs without relying on hardware counters

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Barriers reconsidered, friendlier still!

Content Provider ACM Digital Library
Author Frampton, Daniel Hosking, Antony L. Yang, Xi Blackburn, Stephen M.
Abstract Read and write barriers mediate access to the heap allowing the collector to control and monitor mutator actions. For this reason, barriers are a powerful tool in the design of any heap management algorithm, but the prevailing wisdom is that they impose significant costs. However, changes in hardware and workloads make these costs a moving target. Here, we measure the cost of a range of useful barriers on a range of modern hardware and workloads. We confirm some old results and overturn others. We evaluate the microarchitectural sensitivity of barrier performance and the differences among benchmark suites. We also consider barriers in context, focusing on their behavior when used in combination, and investigate a known pathology and evaluate solutions. Our results show that read and write barriers have average overheads as low as 5.4% and 0.9% respectively. We find that barrier overheads are more exposed on the workload provided by the modern DaCapo benchmarks than on old SPECjvm98 benchmarks. Moreover, there are differences in barrier behavior between in-order and out-of- order machines, and their respective memory subsystems, which indicate different barrier choices for different platforms. These changing costs mean that algorithm designers need to reconsider their design choices and the nature of their resulting algorithms in order to exploit the opportunities presented by modern hardware.
Starting Page 37
Ending Page 48
Page Count 12
File Format PDF
ISBN 9781450313506
DOI 10.1145/2258996.2259004
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2012-06-15
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Garbage collection Write barriers Java Memory management
Content Type Text
Resource Type Article
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