Shenandoah GC

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Shenandoah is a low pause time garbage collector. It reduces GC pause times by performing more garbage collection work concurrently with the running Java program. This includes the concurrent compaction. Therefore its pause times are no longer directly proportional to the size of the heap.

Shenandoah GC was first proposed as part of the OpenJDK in 2014 by Red Hat as JEP 189.. Oracle declined the development but Red Hat continued the development as part of the IcedTea Java project. Shenandoah implements a new algorithm that allows for heap compaction while only stopping the Java threads briefly for root scanning.

In Java 12 Shenandoah GC became an experimental feature.

In Java 15 it became production ready as JEP 379

See also

• Mark-compact algorithm
• Garbage-first collector

External links

• Shenandoah GC
• JavaOne 2015 - Christine Flood - Shenandoah: An Ultralow-Pause-Time Garbage Collector for OpenJDK
• Performance evaluation of Java garbage collectors for large heap transaction based applications
• Understanding the JDK’s New Superfast Garbage Collectors

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📰 Article(s) of the same category(ies)

• Garbage collection (computer science)
• JNode
• UJVM
• GNU Interpreter for Java

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