JDK-8264572: ForkJoinPool.getCommonPoolParallelism() reports always 1

[DougLea]

This reinserts setting common pool parallelism inadvertently clobbered in JDK-8259800

---

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Issue

• JDK-8264572: ForkJoinPool.getCommonPoolParallelism() reports always 1

Reviewers

• Alan Bateman (@AlanBateman - Reviewer)

Reviewing

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[bridgekeeper]

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[openjdk]

@DougLea The following label will be automatically applied to this pull request:

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[mlbridge]

Webrevs

• 00: Full (059cfe4e)

[AlanBateman]

This looks okay to me, I just wonder if we should have a test to the value of getCommonPoolParallelism.

[DougLea]

We once had a test, but now that Runtime.availableProcessors (the only means of checking) can return varying values, we can't include in tck tests. The error here wasn't caught because we didn't run the usual performance tests (that catch these problems immediately) because I was focused only on JDK-8259800. Sorry.

[DougLea]

/integrate

[openjdk]

@DougLea This PR has not yet been marked as ready for integration.

[openjdk]

@DougLea This change now passes all automated pre-integration checks.

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After integration, the commit message for the final commit will be:

8264572: ForkJoinPool.getCommonPoolParallelism() reports always 1

Reviewed-by: alanb

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At the time when this comment was updated there had been 18 new commits pushed to the master branch:

• 9c283da: 8264662: ProblemList vmTestbase/jit/escape/AdaptiveBlocking/AdaptiveBlocking001/AdaptiveBlocking001.java on win-x64 with ZGC
• eb0ac86: 8264655: Minor internal doc comment cleanup
• 3991b32: 8264539: Improve failure message of java/nio/file/WatchService/SensitivityModifier.java
• 4133ded: 8264658: ProblemList javax/swing/JInternalFrame/8146321/JInternalFrameIconTest.java on linux-x64
• 220ddbd: 8264657: ProblemList java/awt/Focus/FrameMinimizeTest/FrameMinimizeTest.java on linux-x64
• d0f3cc9: 8264656: ProblemList sun/security/ssl/SSLSocketImpl/SSLSocketImplThrowsWrongExceptions.java on linux-x64
• 6c145c4: 8264544: Case-insensitive comparison issue with supplementary characters.
• f60e81b: 8264548: Dependencies: ClassHierarchyWalker::is_witness() cleanups
• 177bc84: 8264606: More comment for ECDH public key validation
• 885916e: 8262280: Incorrect exception handling for VMThread in class redefinition
• ... and 8 more: https://git.openjdk.java.net/jdk/compare/5858399062543cc5300b18971d5c4c2639118fc8...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[DougLea]

/integrate

[openjdk]

@DougLea Since your change was applied there have been 18 commits pushed to the master branch:

• 9c283da: 8264662: ProblemList vmTestbase/jit/escape/AdaptiveBlocking/AdaptiveBlocking001/AdaptiveBlocking001.java on win-x64 with ZGC
• eb0ac86: 8264655: Minor internal doc comment cleanup
• 3991b32: 8264539: Improve failure message of java/nio/file/WatchService/SensitivityModifier.java
• 4133ded: 8264658: ProblemList javax/swing/JInternalFrame/8146321/JInternalFrameIconTest.java on linux-x64
• 220ddbd: 8264657: ProblemList java/awt/Focus/FrameMinimizeTest/FrameMinimizeTest.java on linux-x64
• d0f3cc9: 8264656: ProblemList sun/security/ssl/SSLSocketImpl/SSLSocketImplThrowsWrongExceptions.java on linux-x64
• 6c145c4: 8264544: Case-insensitive comparison issue with supplementary characters.
• f60e81b: 8264548: Dependencies: ClassHierarchyWalker::is_witness() cleanups
• 177bc84: 8264606: More comment for ECDH public key validation
• 885916e: 8262280: Incorrect exception handling for VMThread in class redefinition
• ... and 8 more: https://git.openjdk.java.net/jdk/compare/5858399062543cc5300b18971d5c4c2639118fc8...master

Your commit was automatically rebased without conflicts.

Pushed as commit cec66cf.

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