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Type: Enhancement
Resolution: Fixed
Priority: P4
Fix Version/s: 23
Affects Version/s: 17, 21
Component/s: hotspot
Labels:

Subcomponent:
runtime
Resolved In Build:
b11

Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8330776	22.0.2	Sean Coffey	P4	Resolved	Fixed	b04
JDK-8327339	21.0.4-oracle	Ludvig Janiuk	P4	Resolved	Fixed	b01
JDK-8331107	21.0.4	Aleksey Shipilev	P4	Resolved	Fixed	b01
JDK-8333636	17.0.13	Martin Doerr	P4	Resolved	Fixed	b01
JDK-8327451	17.0.12-oracle	Ludvig Janiuk	P4	Resolved	Fixed	b01

In the ConcurrentHashTable::statistics_calculate function, we enter and exit a ScopedCS with the global counter for every single bucket. This has showed up to be pretty intense on some machines. We should make the synchronization a bit less intense here.

backported by

JDK-8327339 ConcurrentHashTable::statistics_calculate synchronization is expensive

Resolved

JDK-8327451 ConcurrentHashTable::statistics_calculate synchronization is expensive

Resolved

JDK-8330776 ConcurrentHashTable::statistics_calculate synchronization is expensive

Resolved

JDK-8331107 ConcurrentHashTable::statistics_calculate synchronization is expensive

Resolved

JDK-8333636 ConcurrentHashTable::statistics_calculate synchronization is expensive

Resolved

links to

Commit openjdk/jdk17u-dev/d1e909fd

Commit openjdk/jdk21u-dev/68d0925b

Commit openjdk/jdk22u/ccb1a3ed

Commit openjdk/jdk/0e2fdc95

Review openjdk/jdk17u-dev/2512

Review openjdk/jdk21u-dev/524

Review openjdk/jdk22u/154

Review openjdk/jdk/17629

(8 links to)

Assignee:: Erik Österlund

Reporter:: Erik Österlund

Votes:: 0 Vote for this issue

Watchers:: 7 Start watching this issue

Created:: 2024-01-30 01:36

Updated:: 2024-08-27 00:40

Resolved:: 2024-02-15 01:28

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