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Almost 10 years ago, i've tested erjang [1] using a medium sized application. Throughput was better than BEAM but latency was terrible.
[1] https://github.com/trifork/erjang/
It's my understanding the state of the art in observing JVM-based applications is a combination of using thread dumps, gc logs, thread activity visualizations. Thread dumps give us a snapshot of the the name of the thread, its current running state (waiting, blocked, etc), and the stacktrace of the work its currently doing. GC logs give you a record of when and how much garbage was collected and Thread activity visualizations show you the timeline of thread moving between different running states.
The BEAM gives you the ability to see the bottlenecks in your system, via the REPL (in real time!)
It has world-class introspection built in that gives you the power to observe and manipulate your running application through a REPL.
The BEAM has hundreds of features like this, because the BEAM is more of an OS than and VM.
I get it, you're a JVM expert, but the BEAM is more than a check list of optimizations that on paper the JVM can do.
I strongly suggest, before the next time you comment on an BEAM VM vs.JVM debate, please consider watching https://www.youtube.com/watch?v=JvBT4XBdoUE, "The Soul of Erlang and Elixir • Sasa Juric • GOTO 2019"
and reading https://github.com/happi/theBeamBook " an attempt to document the internals of the Erlang runtime system and the Erlang virtual machine known as the BEAM."
Best of luck!