Debugger overhead for virtual threads creation

[Egor Ushakov]

Hi everyone!

Is it expected that with the debugger attached creating virtual threads 
is much slower?
We're getting bugs like: https://youtrack.jetbrains.com/issue/IDEA-365900
And I can reproduce it easily with jdb...
Just attaching the debugger immediately slows down virtual threads 
creation significantly.

 >java -agentlib:jdwp=transport=dt_shmem,server=y,suspend=n,address=8000 app
...
6808805 (1.2046688E7 threads per second)
...
after >jdb -attach 8000
...
30215 (95986.055 threads per second)
...

Thanks,
Egor