JVM Performance Tuning, Monitoring and Troubleshooting (2)

Java 6 Performance white paper
http://java.sun.com/performance/reference/whitepapers/6_performance.html#2.3

GC Ergonomics
http://docs.oracle.com/javase/6/docs/technotes/guides/vm/gc-ergonomics.html

Hotspot at a glance
http://www.oracle.com/technetwork/java/javase/tech/index-jsp-136373.html