20th October, OpenJDK 11.0.9 will be released, with full-fledged Shenandoah GC. It has _very_ low pauses and has the `-XX:ShenandoahGCHeuristics=compact` option, which will promptly give unused memory back to the OS (thus keeping the whole memory profile low).

Give it a try.

https://wiki.openjdk.java.net/display/shenandoah/Main

https://www.slideshare.net/jelastic/choosing-right-garbage-c...

https://twitter.com/shipilev/status/1308320432404168705