Welcome to the website of Davis Fiore

In Java the heap is broken down into different generations:

• The young generation contains newly created objects
• The old (or tenured) generation contains long surviving objects. This area is garbage collected less frequently.
• The permanent generations contains classes and methods and it is rarely garbage collected.

Generations make garbage collection more efficient. Short-lived objects are garbage collected more often, because higher is the chance they lose all the references.

The young generation is further broken down into eden, where the objects are first created, and survivor space 0 and 1, where objects are promoted.

The JVM has some command line parameters to size the heap areas as desired:

	-Xms initial heap size
	-Xmx max heap size 
	-Xmn young gen size 
	-XX:PermSize initial permgen size 
	-XX:MaxPermSize max permgen size