log_format apm '"time_local" client=remote_addr '
'method=request_method request="request" '
'request_length=$request_length '
'status=status bytes_sent=bytes_sent '
'body_bytes_sent=$body_bytes_sent '
'referer=$http_referer '
'user_agent="$http_user_agent" '
'upstream_addr=$upstream_addr '
'upstream_status=$upstream_status '
'request_time=$request_time '
'upstream_response_time=$upstream_response_time '
'upstream_connect_time=$upstream_connect_time '
'upstream_header_time=upstream_header_time';</code></pre></div></div><p>值得关注的是下面几个参数：</p><ul class="ul-level-0"><li><strong>upstream_response_time : Time between establish a connection to the upstream server and receiving the last byte of the response body.
request_time</strong> : This is the Full request time , Starting from , the nginx reading the bytes from the client , till Nginx sends the last byte of the response body to the client.</li><li><strong>upstream_connect_time : The time spent establishing a connection with the upstream server
$upstream_header_time : Time between establishing a connection to an upstream server and receiving the first byte of the response header.
取两条日志观察：
代码语言：javascript
复制
"28/Dec/2021:14:42:53 +0000" client=114.85.34.238 method=GET request="GET /%e7%ae%97%e6%b3%95-practice-day-1.html HTTP/2.0" request_length=464 status=200 bytes_sent=6306 body_bytes_sent=5886 referer=- user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36" upstream_addr=unix:/tmp/php7-fpm.sock upstream_status=200 request_time=0.206 upstream_response_time=0.204 upstream_connect_time=0.000 upstream_header_time=0.200
"28/Dec/2021:14:42:53 +0000" client=114.85.34.238 method=GET request="GET /wp-content/themes/neat/ajax-comment/app.css?ver=1.0.0 HTTP/2.0" request_length=140 status=200 bytes_sent=783 body_bytes_sent=520 referer=https://www.noxxxx.com/%e7%ae%97%e6%b3%95-practice-day-1.html user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36" upstream_addr=- upstream_status=- request_time=0.000 upstream_response_time=- upstream_connect_time=- upstream_header_time=-
location ~ [^/].php(/|$) {
fastcgi_cache phpcache; # The name of the cache key-zone to use
fastcgi_cache_valid 200 30m; # What to cache: 'Code 200' responses, for half an hour
fastcgi_cache_methods GET HEAD; # What to cache: only GET and HEAD requests (not POST)
add_header X-Fastcgi-Cache $upstream_cache_status; # Add header so we can see if the cache hits or misses
}
带来的效果非常可观：
文章内页速度：
降幅达 15倍，而仅仅需要配置一下 Nginx，收益很高。
未来可以优化的点：
Mysql 版本，目前使用的是 5.5，但就像大多数的公司项目面临的问题，不太可能升级所有的依赖，风险是其中一个因素，更何况还没有做过相关测试，改动代价太高，暂时不准备动了。
总结：
在利用内存的情况下，可以将之前的 300 多 ms 降低到 150ms 再到 15 ms，可以在低内存的机器上兼顾服务器的利用率和网站体验感。
