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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 11
Affects Version/s: 8u20, 9
Component/s: hotspot
Labels:
- gc-g1
- gc-performance

Subcomponent:
gc
Resolved In Build:
b19

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8205870	11.0.1	Thomas Schatzl	P4	Resolved	Fixed	team

The reference processing phases can, depending on the number of soft references and the amount of retained objects take a significant amount of time.

To decrease the duration of the phase it is possible to use the ParallelRefProcEnabled switch - however that needs to be done manually.

The goal of this CR is to dynamically turn on parallel reference processing for the different gc phases.

One way to do this is to estimate the amount of work as fraction of the total gc pause time, and if this crosses a threshold, enable parallel reference processing automatically.

backported by

JDK-8205870 Dynamically parallelize reference processing work

Resolved

blocks

JDK-8205043 Make parallel reference processing default for G1

Resolved

duplicates

JDK-7068229 G1: Dynamically enable MT reference processing for remark pauses

Closed

JDK-8181214 ReferenceProcessor should shortcut execution on empty lists

Closed

is blocked by

JDK-8204617 ParallelGC parallel reference processing does not set MT degree in reference processor

Resolved

relates to

JDK-6938732 Ergonomify (parallel) reference processing

Open

JDK-8051680 (ref) unnecessary process_soft_ref_reconsider

Resolved

JDK-8072498 Multi-thread JNI weak reference processing

Resolved

JDK-8173335 Improve logging for j.l.ref.reference processing

Resolved

JDK-8204686 Dynamic parallel reference processing support for Parallel GC

Resolved

JDK-8076462 Preserving the referents of concurrent mark work distribution method causes long pause times

Closed

JDK-7068229 G1: Dynamically enable MT reference processing for remark pauses

Closed

JDK-8173211 G1: Enqueuing dirty cards during reference enqueuing in phase 3 does not scale

Closed

JDK-8203951 ReferenceProcessor::_has_adjustable_queue should be removed when CMS is obsoleted

Closed

JDK-8172792 JEP 308: Improve Dynamic Number of Thread Sizing for G1

Closed

JDK-8181214 ReferenceProcessor should shortcut execution on empty lists

Closed

JDK-8078117 Refactor enqueue_discovered_references() and redirty_logged_cards() to share the same work gang.

Closed

(12 relates to)

Assignee:: Thomas Schatzl

Reporter:: Thomas Schatzl

Votes:: 0 Vote for this issue

Watchers:: 7 Start watching this issue

Created:: 2014-05-20 12:59

Updated:: 2023-08-21 07:02

Resolved:: 2018-06-18 03:15

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