ThreadDump safepoint ever invoked by ZGC?

[Stefan Karlsson]

Hi Barry,

On 2020-02-28 21:50, Barry Galster wrote:
> ZGC experts,
> I have a trio of questions for you:
>
>
>    1.  Does ZGC ever invoke the ThreadDump safepoint?

ZGC in it self does not invoke any ThreadDump safepoints. However, there 
are different serviceability and management features/APIs that do. They 
are independent of what GC is used.

A few of the APIs can be found here:
https://docs.oracle.com/en/java/javase/13/docs/api/java.management/java/lang/management/ThreadMXBean.html

and in the Thread class:
https://docs.oracle.com/en/java/javase/13/docs/api/java.base/java/lang/Thread.html

>    2.  If so, why?
>    3.  Is there any way to disable this?

There's no way that I'm aware of, except trying to turn figure out what 
management APIs are used and disable them somehow.

StefanK

>
> Regards,
> Barry
>
> Barry Galster
> Performance Engineer - Team Lead
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