nginx gzip

nginx gzip

The ngx_http_gzip_module module is a filter that compresses responses using the “gzip” method. This often helps to reduce the size of transmitted data by half or even more.

根据官网文档说明，通过开启nginx gzip压缩，数据传输量可以减少一半甚至更多。在网络带宽成为瓶颈的情况下，gzip带来的提升无疑是相当有诱惑力的。

未开启gzip：

$ ./wrk -t10 -c200 -d30s http://120.25.176.131/testMysql
Running 30s test @ http://120.25.176.131/testMysql
  10 threads and 200 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     0.00us    0.00us   0.00us    -nan%
    Req/Sec     0.00      0.00     0.00      -nan%
  0 requests in 30.01s, 4.04MB read
Requests/sec:      0.00
Transfer/sec:    137.73KB

惨不忍睹，基本上是把服务器压死了。

开启gzip：
按照官网示例，在nginx.conf添加下面的配置

gzip            on;
gzip_min_length 1000;
gzip_proxied    expired no-cache no-store private auth;
gzip_types      text/plain application/xml;

压测结果

$ ./wrk -t10 -c200 -d30s http://120.25.176.131/testMysql
Running 30s test @ http://120.25.176.131/testMysql
  10 threads and 200 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     0.00us    0.00us   0.00us    -nan%
    Req/Sec     0.00      0.00     0.00      -nan%
  0 requests in 30.02s, 4.02MB read
Requests/sec:      0.00
Transfer/sec:    137.12KB

好吧，从压测结果来看，并没有什么明显的改善。。。没办法，这台服务器配置实在够差。
但是，通过chrome浏览器提供的调试工具，可以看到API的返回数据两压缩了6倍左右，从用户的角度来说就是接口响应变快了，用户体验当然更好。

-	数据长度	Waiting(TTFB)	Content Download
关闭gzip	734KB	20.67ms	4.56s
开启gzip	229KB	29.58ms	699.19ms