Yes, we do. It's actually a rather small setup (13 dedicated server, about 100 containers).

The absolutely most basic advice is probably: "-Xmx" does not represent the actual upper limit for memory usage. We actually most often only set 50% of the assigend memory for the jvm.

Somebody mentioned https://github.com/cloudfoundry/java-buildpack-memory-calcul... which seems pretty interesting.