CMS 垃圾回收日志
https://blogs.oracle.com/poonam/entry/understanding_cms_gc_logs
http://www.blogjava.net/DLevin/archive/2015/08/01/426418.html
http://iamzhongyong.iteye.com/blog/1989829
http://ifeve.com/jvm-cms-log/
http://blog.csdn.net/historyasamirror/article/details/6245157
http://alaric.iteye.com/blog/2263682
典型配置：
http://www.importnew.com/19264.html