JDK-8268105 : Release Note: Parallel GC Enables Adaptive Parallel Reference Processing by Default
- Type: Sub-task
- Component: hotspot
- Sub-Component: gc
- Affected Version: 17
- Priority: P4
- Status: Closed
- Resolution: Delivered
- Submitted: 2021-06-02
- Updated: 2022-03-23
- Resolved: 2022-03-23
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
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| JDK 17 |
|---|
17Resolved  |
Description
Parallel GC now ergonomically determines the optimal number of threads to use for processing `java.lang.ref.Reference` instances during garbage collection. The option `-XX:ParallelRefProcEnabled` is now `true` (enabled) by default. The change improves this phase of the garbage collection pause significantly on machines with more than one thread available for garbage collection. If you experience increased garbage collection pauses, you can revert to the original behavior by specifying `-XX:-ParallelRefProcEnabled` on the command line. The ergonomics of `java.lang.ref.Reference` processing can be tuned by using the experimental option `-XX:ReferencesPerThread` (default value: 1000).