四，JVM 自带工具之jvisualvm

http://www.ibm.com/developerworks/cn/java/j-lo-visualvm/index.html?ca=drs-

https://visualvm.java.net/zh_CN/gettingstarted.html

http://blog.csdn.net/fenglibing/article/details/6298326

 http://freewind.me/blog/20111023/479.html