Concurrent mark sweep collector

The concurrent mark sweep collector (concurrent mark-sweep collector, concurrent collector or CMS)[1] was a mark-and-sweep garbage collector in the Oracle HotSpot Java virtual machine (JVM) available since version 1.4.1. It was deprecated on version 9[2] and removed on version 14,[3] so from Java 15 it is no longer available.[4][5]

HotSpot garbage collectors
Main article: HotSpot (virtual machine)

The HotSpot JVM selects the default garbage collector based on several factors.[6] The newer garbage-first collector (G1) was planned to replace CMS.[7] That change was finally done in version 9.

To launch the JVM with this garbage collector you can add this property to the java command line -XX:+UseConcMarkSweepGC[8][1] when using java version less than 14.

See also

References
  1. "Concurrent Mark Sweep Collector Enhancements".
  2. "JEP 291: Deprecate the Concurrent Mark Sweep (CMS) Garbage Collector".
  3. "JEP 363: Remove the Concurrent Mark Sweep (CMS) Garbage Collector".
  4. "JVM Garbage Collectors".
  5. "Release Note: JEP 363: Remove the Concurrent Mark and Sweep (CMS) Garbage Collector".
  6. "Garbage Collector Ergonomics".
  7. "Java HotSpot Garbage Collection".
  8. "Garbage Collectors".


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