GC settings

Let’s start with stating that there is no "one to rule them all" - each deployment and use-case is different, however we will try to give a couple of pointers and recommendations proceed with short introduction to GC itself.

XMPP is quite specific in terms of memory allocation - short-lived objects (various types of stanzas) usually exceed number of long-lived objects (user connections and related data). This is important bit of information in the context of how usually JVM HEAP is organized and how Garbage Collector works. On the most basic level Heap is separated into couple of regions: