只要池达到pm.max_children，Nginx就会在尝试向PHP-FPM发送新请求时开始超时。 “最大侦听队列”在php状态页面中始终为0。
这里是一个php-fpm池的例子：
[example] catch_workers_output = no ; Configure listener listen = /var/run/php-fpm/example.sock listen.backlog = 65535 listen.owner = nginx listen.group = nginx ; Unix user/group of processes user = nginx group = nginx ; Choose how the process manager will control the number of child processes. pm = ondemand pm.max_children = 10 pm.max_requests = 200 pm.process_idle_timeout = 30s pm.status_path = /status ; Pass environment variables env[HOSTNAME] = $HOSTNAME env[PATH] = /usr/local/bin:/usr/bin:/bin env[TMP] = /tmp env[TMPDIR] = /tmp env[TEMP] = /tmp ; Host specific php ini settings here php_admin_flag[log_errors] = on php_admin_value[open_basedir] = /tmp:/var/www/apc:/var/www/wordpress/example php_admin_value[error_log] = /var/log/php-fpm/example.log