性能

http://blog.csdn.net/defonds/article/details/52598018 http://blog.csdn.net/defonds/article/details/52605670 https://github.com/alibaba/TProfiler/wiki/TProfiler%E5%AE%9E%E7%8E%B0%E5%8E%9F%E7%90%86 http://www.jianshu.com/p/fd6e35f529c1
https://segmentfault.com/a/1190000007608782
http://web.mit.edu/ghudson/dev/openfire/documentation/docs/javadoc/org/jivesoftware/util/LinkedListNode.html
b+索引 冲突链
http://os.51cto.com/art/201601/504538.htm
http://os.51cto.com/art/201601/504020.htm
http://wushank.blog.51cto.com/3489095/1708168
http://blog.csdn.net/column/details/14851.html
http://os.51cto.com/art/201209/357433.htm