工具：Yslow
压力测试：
http://www.searchtb.com/2012/05/using-tcpcopy-to-simulate-traffic.html
http://www.searchtb.com/2010/12/cpp-methods-in-performance.html
http://download.csdn.net/download/yehuijun/3716698
http://www.cnblogs.com/luluping/archive/2009/08/19/1549637.html