nginx开启日志，指定格式，查看执行时间

nginx配置：
       access_log on;
      
       log_format  access  '$remote_addr – $remote_user [$time_local] "$request"'
                           '$request_time $upstream_response_time'
                           '$status $body_bytes_sent "$http_referer"'
                           '"$http_user_agent" $http_x_forwarded_for';
     
        access_log  /home/wwwlogs/access.log access;     

tail -f /home/wwwlogs/access.log

192.168.20.46 – - [15/Dec/2016:14:51:26 +0800] "GET /pc/search/?pData%5Bq%5D=%E5%B9%95%E7%BB%84&pData%5Btype%5D=video&pData%5Bsort%5D=&pData%5BvideoLength%5D=&pData%5Bstate%5D=1&pData%5BconvertState%5D=3&pData%5Bhz%5D=&pData%5Brows%5D=30&pData%5BcategoryId%5D=&pData%5Bstart%5D=0 HTTP/1.1"0.213 0.213200 44 "-""Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36" -