先查看日志 /data1/server/php-cgi/var/log/php-fpm.log
[19-Dec-2012 11:41:13] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
修改参数
pm.max_children = 1000
server reached pm.max_children setting (5), consider raising it
原文：http://www.cnblogs.com/norm/p/7565297.html