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  1. Proceedings of the 3rd international symposium on Memory management (ISMM '02)
  2. An adaptive, region-based allocator for java
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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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An adaptive, region-based allocator for java

Content Provider ACM Digital Library
Author Qian, Feng Hendren, Laurie
Abstract This paper introduces an adaptive, region-based allocator for Java. The basic idea is to allocate non-escaping objects in local regions, which are allocated and freed in conjunction with their associated stack frames. By releasing memory associated with these stack frames, the burden on the garbage collector is reduced, possibly resulting in fewer collections.The novelty of our approach is that it does not require static escape analysis, programmer annotations, or special type systems. The approach is transparent to the Java programmer and relatively simple to add to an existing JVM. The system starts by assuming that all allocated objects are local to their stack region, and then catches escaping objects via write barriers. When an object is caught escaping, its associated allocation site is marked as a non-local site, so that subsequent allocations will be put directly in the global region. Thus, as execution proceeds, only those allocation sites that are likely to produce non-escaping objects are allocated to their local stack region.The paper presents the overall idea, and then provides details of a specific design and implementation. In particular, we present a region-based allocator and the necessary modifications of the Jikes RVM baseline JIT and a copying collector. Our experimental study evaluates the idea using the SPEC JVM98 benchmarks, plus one other large benchmark. We show that a region-based allocator is a reasonable choice, that overheads can be kept low, and that the adaptive system is successful at finding local regions that contain no escaping objects.
Starting Page 127
Ending Page 138
Page Count 12
File Format PDF
ISBN 1581135394
DOI 10.1145/512429.512446
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2002-06-20
Publisher Place New York
Access Restriction Subscribed
Content Type Text
Resource Type Article
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