This is true. Erlang's heap per PID. Azul's C4 and other JVM GC move in the no world stopping direction but they're still at the mercy of the model of the JVM.

This is true. Erlang's heap per PID. Azul's C4 and other JVM GC move in the no world stopping direction but they're still at the mercy of the model of the JVM. If one can avoid GCs altogether a-la precise (de)allocations like Rust's non-reference-counted entities, this is cool but often requires unnatural contortionism. RC is still necessary in certain cases.