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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 9
Affects Version/s: hs25, 8
Component/s: hotspot
Labels:

Subcomponent:
gc
Resolved In Build:
b03

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8045197	8u25	Thomas Schatzl	P4	Resolved	Fixed	b01
JDK-8032232	8u20	Thomas Schatzl	P4	Resolved	Fixed	b01
JDK-8053202	emb-8u26	Thomas Schatzl	P4	Resolved	Fixed	b17
JDK-8033519	7u80	Thomas Schatzl	P4	Resolved	Fixed	b01
JDK-8034538	7u65	Thomas Schatzl	P4	Resolved	Fixed	b01
JDK-8028403	7u60	Thomas Schatzl	P4	Closed	Fixed	b05

At the end of a GC that treated strings as a weak root for traversal, the string table is scanned for unreferenced entries, which are then deleted.

This can be time-consuming if the string table is large; this RFE is about improving the performance.

One way to do this is to parallelize the effort; ~~JDK-8004888~~ implemented parallel traversal by claiming hash table buckets on a per-thread basis. A similar method could be applied in this case, and provided for all uses in a parallel collector (at least CMS, the parallel gcs, G1 full gc and during the G1 remark pause).

backported by

JDK-8032232 Improve performance of Stringtable unlink

Resolved

JDK-8033519 Improve performance of Stringtable unlink

Resolved

JDK-8034538 Improve performance of Stringtable unlink

Resolved

JDK-8045197 Improve performance of Stringtable unlink

Resolved

JDK-8053202 Improve performance of Stringtable unlink

Resolved

JDK-8028403 Improve performance of Stringtable unlink

Closed

relates to

JDK-8033443 Test8000311 fails after latest changes to parallelize string and symbol table unlink

Resolved

JDK-8033106 Wrong predicate for checking whether the correct amount of symbol table entries have been processed in G1

Resolved

JDK-8031472 Fine tune string/symbol table parallelization

Open

JDK-8031473 Parallelize symbol table and string table unlink in non-G1 parallel collectors

Open

JDK-8031565 Use serial/waiting time to perform independent tasks during young gc in G1

Open

JDK-8027454 Do not traverse string table during G1 remark when treating them as strong roots during initial mark

Resolved

JDK-6996604 Use more efficient (not linear) data structure for searching buckets in SymbolTable

Closed

(1 backported by, 7 relates to)

Assignee:: Thomas Schatzl

Reporter:: Thomas Schatzl

Votes:: 0 Vote for this issue

Watchers:: 4 Start watching this issue

Created:: 2013-10-29 11:15

Updated:: 2014-07-29 07:21

Resolved:: 2014-01-20 03:49

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