NDLI: Older-first garbage collection in practice:evaluation in a Java Virtual Machine

Content Provider	ACM Digital Library
Author	McKinley, Kathryn S. Stefanović, Darko Moss, J. Eliot B. Hertz, Matthew Blackburn, Stephen M.
Abstract	Until recently, the best performing copying garbage collectors used a generational policy which repeatedly collects the very youngest objects, copies any survivors to an older space, and then infrequently collects the older space. A previous study that used garbage-collection simulation pointed to potential improvements by using an Older-First copying garbage collection algorithm. The Older-First algorithm sweeps a fixed-sized window through the heap from older to younger objects, and avoids copying the very youngest objects which have not yet had sufficient time to die. We describe and examine here an implementation of the Older-First algorithm in the Jikes RVM for Java. This investigation shows that Older-First can perform as well as the simulation results suggested, and greatly improves total program performance when compared to using a fixed-size nursery generational collector. We further compare Older-First to a flexible-size nursery generational collector in which the nursery occupies all of the heap that does not contain older objects. In these comparisons, the flexible-nursery collector is occasionally the better of the two, but on average the Older-First collector performs the best.
Starting Page	25
Ending Page	36
Page Count	12
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/773039.773042
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	38
Issue Number	2 supplement
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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