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。
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