Add support for ManagementFactory.getThreadMXBean().dumpAllThreads()

[mhalbritter]

Right now, ManagementFactory.getThreadMXBean().dumpAllThreads() throws a com.oracle.svm.core.jdk.UnsupportedFeatureError. Would be great if it could really do a thread dump.

GraalVM: 22.1

[theotherp]

Any chances of this getting implemented? It would help a lot with debugging performance problems.

[SergejIsbrecht]

Any chances of this getting implemented? It would help a lot with debugging performance problems.

If you are looking into time spend on CPU, I would suggest using perf on Linux. See https://www.graalvm.org/latest/reference-manual/native-image/debugging-and-diagnostics/DebugInfo/ .

NOTE: I did get better results with -H:+PreserveFramePointer instead of -g. When using FP, you would use perf record --call-graph=fp ..., which is actually the default. For -g, you would use perf record --call-graph=dwarf ....

[theotherp]

Thanks for the advice, but my use case is somewhat different. I've developed a program for end users which I converted to Native Image. Previously when debugging performance issues I could have them just click a button which would log the stack trace in the log and they could send the log to me. Now asking them to run per inside a docker container is a bit more complex :-)

[SergejIsbrecht]

I guess as an alternative you could use Thread.getAllStackTraces() to write everything out to a file?

[theotherp]

Didn't know that would work with graal, will try it out. Thanks!

Why would this work but not the other call? I wouldve thought it's basically the same.

On Mon, 19 Feb 2024, 16:33 SergejIsbrecht, @.***> wrote:

I guess as an alternative you could use Thread.getAllStackTraces() to write everything out to a file?

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[cmdjulian]

For Spring Actuator it's the same, it uses ManagementFactory.getThreadMXBean().dumpAllThreads(true, true) to dump all threads. As long as this is not supported it is unfortunately unable to provide the thread dump Actuator functionality.