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]

HotSpot garbage collectors

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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.

References

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v t e Memory management
Memory management as a function of an operating system
Hardware	Memory management unit (MMU) Translation lookaside buffer (TLB) Input–output memory management unit (IOMMU)
Virtual memory	Demand paging Memory paging Page table Virtual memory compression
Segmentation	Protected mode Real mode Virtual 8086 mode x86 memory segmentation
Allocator	dlmalloc Hoard jemalloc libumem mimalloc ptmalloc
Manual means	Static memory allocation C dynamic memory allocation new and delete (C++)
Garbage collection	Automatic Reference Counting Boehm garbage collector Cheney's algorithm Concurrent mark sweep collector Finalizer Garbage Garbage-first collector Mark–compact algorithm Reference counting Tracing garbage collection Strong reference Weak reference
Safety	Buffer overflow Buffer over-read Dangling pointer Stack overflow
Issues	Fragmentation Memory leak Unreachable memory
Other	Automatic variable International Symposium on Memory Management Region-based memory management Memory pool
Memory management Virtual memory Automatic memory management Memory management algorithms Memory management software

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Concurrent mark sweep collector

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Concurrent mark sweep collector

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