开启php-fpm状态页有助于我们分析当前php请求的情况，来决定php-fpm参数是否设置合理。
nginx配置：

location /status {
      fastcgi_index  index.php;
      fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
      include        fastcgi_params;
      fastcgi_pass unix:/dev/shm/php-cgi.sock;
}

php-fpm配置：

pm.status_path = /status

状态页sample:

pool:                 www
process manager:      static
start time:           20/Sep/2013:15:59:36 +0900
start since:          944
accepted conn:        300499
listen queue:         0
max listen queue:     0
listen queue len:     0
idle processes:       999
active processes:     1
total processes:      1000
max active processes: 438
max children reached: 0
slow requests:        0