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JDK-8255450: runtime/ThreadCountLimit.java causes high system load #876

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@tstuefe tstuefe commented Oct 27, 2020

Hi,

this is rather trivial:

runtime/ThreadCountLimit.java, introduced with JDK-8222671, caused problems on our test machines (JDK-8222671 is private and cannot be accessed from outside Oracle, so all I know comes from its review thread [1]).

The test creates massive amount of threads in order to hit some OS limit which would manifest as an OOM. This affects unrelated processes, unless the test is executed in a jail or with specific limits set.

This test probably should be executed with a specific limit, but for now lets mark it as @stress and remove it from tier1.


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Linux x32 Linux x64 Windows x64 macOS x64
Build ✔️ (1/1 passed) ✔️ (5/5 passed) ✔️ (2/2 passed) ✔️ (2/2 passed)
Test (tier1) ✔️ (9/9 passed) ⏳ (1/9 running) ✔️ (9/9 passed)

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  • JDK-8255450: runtime/ThreadCountLimit.java causes high system load

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$ git fetch https://git.openjdk.java.net/jdk pull/876/head:pull/876
$ git checkout pull/876

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bridgekeeper bot commented Oct 27, 2020

👋 Welcome back stuefe! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

@openjdk openjdk bot added the rfr Pull request is ready for review label Oct 27, 2020
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openjdk bot commented Oct 27, 2020

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

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@openjdk openjdk bot added the hotspot hotspot-dev@openjdk.org label Oct 27, 2020
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Webrevs

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This makes sense to me. On my TR 3970X with Linux x86_64 release, it peaks at 70G VIRT, 3G RSS, and fails half of the time. The test itself should probably made more resilient, but even then it does not look like tier1-grade test.

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openjdk bot commented Oct 27, 2020

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

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

8255450: runtime/ThreadCountLimit.java causes high system load

Reviewed-by: shade

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 5 new commits pushed to the master branch:

  • 504cb00: 8252113: Move jfr man page into jfr module
  • 552192f: 8255305: Add Linux x86_32 tier1 to submit workflow
  • 66a3917: 8255331: Problemlist java/foreign/TestMismatch.java on 32-bit platforms until JDK-8254162
  • cf56c7e: 8254980: ZGC: ZHeapIterator visits armed nmethods with -XX:-ClassUnloading
  • 18d9905: 8255342: Remove non-specified JVM checks on Classes with Record attributes

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@openjdk openjdk bot added the ready Pull request is ready to be integrated label Oct 27, 2020
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tstuefe commented Oct 27, 2020

Following the trivial rule I will integrate this patch.

/integrate

@openjdk openjdk bot closed this Oct 27, 2020
@openjdk openjdk bot added integrated Pull request has been integrated and removed ready Pull request is ready to be integrated rfr Pull request is ready for review labels Oct 27, 2020
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openjdk bot commented Oct 27, 2020

@tstuefe Since your change was applied there have been 5 commits pushed to the master branch:

  • 504cb00: 8252113: Move jfr man page into jfr module
  • 552192f: 8255305: Add Linux x86_32 tier1 to submit workflow
  • 66a3917: 8255331: Problemlist java/foreign/TestMismatch.java on 32-bit platforms until JDK-8254162
  • cf56c7e: 8254980: ZGC: ZHeapIterator visits armed nmethods with -XX:-ClassUnloading
  • 18d9905: 8255342: Remove non-specified JVM checks on Classes with Record attributes

Your commit was automatically rebased without conflicts.

Pushed as commit 7d41a54.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

@tstuefe tstuefe deleted the JDK-8255450 branch November 2, 2020 13:51
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