Shallow and retained sizes

1：Shallow and retained sizes

http://www.yourkit.com/docs/11/help/sizes.jsp

yourkit分析工具的文档，有图示说明。

2：Shallow and retained heap

http://publib.boulder.ibm.com/infocenter/hctool/v1r0/index.jsp?topic=%2Fcom.ibm.java.diagnostics.memory.analyzer.doc%2Fshallowretainedheap.html

IBM 文档中的解释，概念上多了个Retained set 更加完整，不过图示不怎么好

3：How much memory do I need (part 1) – What is retained heap?

http://plumbr.eu/blog/how-much-memory-what-is-retained-heap

4：How much memory do I need (part 2) – What is shallow heap?

http://plumbr.eu/blog/how-much-memory-do-i-need-part-2-what-is-shallow-heap