用户、流量啥的都不大，
fpm进程参数如下：
pm.max_children = 100
pm.start_servers =80
pm.min_spare_servers = 20
日志如下，从启用开始就报的错
[31-Jul-2014 18:49:14] NOTICE: [pool www] child 26462 started
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 24743 exited with code 0 after 891.856027 seconds from start
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 26502 started
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 24758 exited with code 0 after 891.158274 seconds from start
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 26503 started
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 24739 exited with code 0 after 891.976156 seconds from start
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 26505 started
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 24761 exited with code 0 after 890.977127 seconds from start
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 26506 started
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 24770 exited with code 0 after 891.006928 seconds from start
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 26508 started
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 24753 exited with code 0 after 891.929728 seconds from start
[31-Jul-2014 18:49:15] NOTICE: [pool www] child 26509 started
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 24773 exited with code 0 after 891.386904 seconds from start
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 26518 started
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 24775 exited with code 0 after 891.396730 seconds from start
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 26519 started
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 24766 exited with code 0 after 891.421983 seconds from start
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 26520 started
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 24768 exited with code 0 after 891.440330 seconds from start
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 26521 started
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 24776 exited with code 0 after 891.438618 seconds from start
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 26523 started
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 24772 exited with code 0 after 891.440693 seconds from start
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 26524 started
[31-Jul-2014 18:49:16] NOTICE: [pool www] child 24792 exited with code 0 after 891.287219 seconds from start
求解决方案
网站挂了，nginx+php-fpm 重启php-fpm暂时解决
原文：http://my.oschina.net/maintenance/blog/343129