Dell R430 2个物理CPU,每个CPU有6个内核；
www.conf:
pm = dynamic
pm.max_children = 120
pm.start_servers = 8
pm.min_spare_servers = 6
pm.max_spare_servers = 12
pm.process_idle_timeout = 20s;
pm.max_requests = 10240
创建php-fpm日志：
mkdir /var/log/php-fpm && chown nginx:nginx /var/log/php-fpm && chmod 777 /var/log/php-fpm
sed -i '/^php_admin_value/cphp_admin_value[error_log] = /var/log/fpm-php/fpm-php.www.log' /etc/php7/fpm/php-fpm.d/www.conf