摘自：

http://blog.csdn.net/zhoudaxia/article/details/26946927

http://hllvm.group.iteye.com/group/topic/39019

http://blog.csdn.net/kemengli/article/details/46707587

http://blog.csdn.net/wangpingfang/article/details/53945479

jvm内存调优1