NDLI: Reducing pause times with clustered collection

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Reducing pause times with clustered collection

Content Provider	ACM Digital Library
Author	Morris, Robert Cutler, Cody
Abstract	Each full garbage collection in a program with millions of objects can pause the program for multiple seconds. Much of this work is typically repeated, as the collector re-traces parts of the object graph that have not changed since the last collection. Clustered Collection reduces full collection pause times by eliminating much of this repeated work. Clustered Collection identifies clusters: regions of the object graph that are reachable from a single "head" object, so that reachability of the head implies reachability of the whole cluster. As long as it is not written, a cluster need not be re-traced by successive full collections. The main design challenge is coping with program writes to clusters while ensuring safe, complete, and fast collections. In some cases program writes require clusters to be dissolved, but in most cases Clustered Collection can handle writes without having to re-trace the affected cluster. Clustered Collection chooses clusters likely to suffer few writes and to yield high savings from re-trace avoidance. Clustered Collection is implemented as modifications to the Racket collector. Measurements of the code and data from the Hacker News web site (which suffers from significant garbage collection pauses) and a Twitter-like application show that Clustered Collection decreases full collection pause times by a factor of three and six respectively. This improvement is possible because both applications have gigabytes of live data, modify only a small fraction of it, and usually write in ways that do not result in cluster dissolution. Identifying clusters takes more time than a full collection, but happens much less frequently than full collection. .
Starting Page	131
Ending Page	142
Page Count	12
File Format	PDF
ISBN	9781450335898
DOI	10.1145/2754169.2754184
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-06-14
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Garbage collection Memory management
Content Type	Text
Resource Type	Article

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