Concurrent mark sweep collector

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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]

Contents

HotSpot garbage collectors

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. 1 2 "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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