Difference between Old generation and Tenured generation

Question

Now I trying to understand fundamental concepts of java garbage collection.

I have read a lot articles about it.

And somewhere I see old generation and somewhere tenured generation. Description is very similar.

looks like one of them is the evolution of second.

Can you provide more information about this topiс?

Answer 1

I've always regarded the Old Generation and Tenured Generation as the same thing, and this diagram from http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/gc01/index.html backs that up.

if you Google Old generation versus Tenured you'll also find lots of people saying things like "Tenured (Old) Generation" -like http://www.javaspecialists.eu/archive/Issue092.html

Occasionally, I've seen people regard Old Generation as the Tenured + Permanent Generation but I've never seen any official confirmation for that.

Answer 2

Anyway the Permanent Generation is moved to native space and is out of GC competence in Java 8. So now it seems to be the same.