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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 24
Affects Version/s: 22
Component/s: hotspot
Labels:
- gc-parallel

Subcomponent:
gc
Resolved In Build:
b14

ParallelGC splits large objarrays into partial subtasks, a leading chunk and the remaining tail task (PartialArrayScanTask), with the tail pushed on the mark stack. When a tail task is encountered, it is similarly split.

As discussed in ~~JDK-8253237~~, there are some problems with this mechanism, as it may not provide as much parallelism as one might hope. That change introduced some new infrastructure (PartialArrayTaskStepper) to manage splitting in a way that provides more opportunities for parallelism without flooding the mark stack. Only G1 currently uses this mechanism. ParallelGC should be enhanced to also use it.

blocks

JDK-8339028 Re-evaluate workaround for very slow DelayInducer

Closed

relates to

JDK-8309960 ParallelGC young collections very slow in DelayInducer

Closed

JDK-8310031 Parallel: Implement better work distribution for large object arrays in old gen

Resolved

JDK-8337709 Use allocated states for chunking large array processing

Resolved

JDK-8340119 Remove oopDesc::size_might_change()

Resolved

JDK-8341332 Refactor array chunking statistics counters

Open

JDK-8339668 Parallel: Adopt PartialArrayState to consolidate marking stack in Full GC

In Progress

JDK-8253237 [REDO] Improve large object handling during evacuation

Resolved

links to

Commit(master) openjdk/jdk/4f071ce0

Review(master) openjdk/jdk/20720

(3 relates to, 2 links to)

Assignee:: Kim Barrett

Reporter:: Kim Barrett

Votes:: 0 Vote for this issue

Watchers:: 4 Start watching this issue

Created:: 2023-06-30 02:25

Updated:: 2024-10-01 12:39

Resolved:: 2024-08-30 18:15

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