Project Loom VirtualThreads hang

[Alan Bateman]

On 04/01/2023 04:59, robert engels wrote:
> :
>
> Here is a async profile capture of 3b:
>
>
> Notice that the vast majority of the time is used in internal context 
> switching.
>
I can't immediately tell if there is a Heisenberg effect here but the 
notifyJvmtiMountXXX methods suggest that the profiler has a JVMTI 
environment. There is work in progress to address scalability issues 
with JVMTI in exactly this area. In the mean-time, it would be useful if 
you could re-run the profiler with the test running with:

-XX:+UnlockExperimentalVMOptions -XX:+DoJVMTIVirtualThreadTransitions

-Alan
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