XHProf 扩展安装
git clone https://github.com/longxinH/xhprof cd /xhprof/extension phpize && ./configure --with-php-config=/usr/local/php/bin/php-config make && make install
yaconf.directory=/tmp/yaconf/
xhprof.output_dir=/tmp/xhprof
原文：http://www.cnblogs.com/jkklearn/p/7108724.html