RFR: 8346875: Test jdk/jdk/jfr/event/os/TestCPULoad.java fails on macOS

[Matthias Baesken]

On Wed, 15 Jan 2025 14:02:55 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The test fails on some new Mac instances (macOS 14.5 (macOS aarch64) , CPU Apple M2) with :
> java.lang.AssertionError: Expected at least one event
> at jdk.jfr.event.os.TestCPULoad.main(TestCPULoad.java:62)
> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
> at java.base/java.lang.reflect.Method.invoke(Method.java:565)
> at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
> at java.base/java.lang.Thread.run(Thread.java:1447)
> 
> The current sleep value seems to be a bit too slow for those machines.  The issues occured (mostly) with fastdebug binaries.

Not sure if it is this line.  Should we maybe add some UL tracing; enable it for the test and see if we hit this ?

> Maybe we should do some work instead of additional sleeping?

Could be that this helps;  or increase the sleep time (but less than I did) AND do some CPU intensive work .

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PR Comment: https://git.openjdk.org/jdk/pull/23136#issuecomment-2594780617