Hi all,
I am currently looking into making os::get_thread_cpu_time() usable
on *BSD because we in the gc team would like to use this functionality
in the future.
The idea is to get an accurate measurement of how much CPU time the GC
threads take to do heap sizing.
For this reason, for some time there is that
os::get_thread_cpu_time(Thread*) that returns the user+sys time the
given thread (id) took since creation API that is unimplemented on *BSD
except OSX.
Is there something on *BSD that would satisfy the requirements?
I only could find getrusage(RUSAGE_THREAD), that only gets this
information for the calling thread, which is not enough and too
complicated/expensive to start the threads themselves. Also it only
seems to be supported on OpenBSD and FreeBSD.
The method seems also required for JVMTI, JFR, some management API and
some collectors (Shenandoah uses it), so these are already not working
optimally or not at all on *BSD.
This would add G1, the default collector, not working as well (or not
optimally).
Thanks,
Thomas
(I'm aware that this mailing list might be dead, the last message was
from 2019, but maybe....)
