Varnish VS Nginx测试报告

     1：配置情况

nginx机器配置：
CPU：     E7500  @ 2.93GHz (双核)
内存：4G
varnish机器配置：
CPU：     E3300  @ 2.50GHz (双核)
内存：2G
测试脚本执行机器配置：
CPU：     AMD Phenom(tm) II X4 925 Processor
内存：2G

     2：测试准备工作

2.1：安装siege

使用压力测试工具siege（http://www.joedog.org/index/siege-home） 来验证。可以根据路径来并发重复压力测试。安装方式：
下载：wget ftp://sid.joedog.org/pub/siege/siege-latest.tar.gz
安装：
#./configure
#make && make install

[root@localhost test] siege -c 100 -r 100 -f varnish_url.txt
[root@localhost test] siege -c 100 -r 100 -f nginx_url.txt

参数说明：
-c 100 并发100个用户
-r 100 重复循环100次
-f varnish_url.txt 任务列表：URL列表

2.2：构造URL
构造了536个url测试，其中1个是错误的url。

到测试机器上,

[root@localhost test] cd /data/htdocs/resources/web
[root@localhost test] find . -name "*.jpg" -print > varnish_url.txt

2.3：开启nginx页面缓存方法
开启nginx的缓存图片的方法，在nginx的conf中添加：

location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|ico)$ {
    expires      30d;
    access_log   off;
}
感谢鱼哥 @smallfishxy 指导

    3：运行后测试结果：

3.1.1：nginx开启页面缓存的情况

Transactions:                  10000 hits
Availability:                 100.00 %
Elapsed time:                  65.83 secs
Data transferred:             260.83 MB
Response time:                  0.01 secs
Transaction rate:             151.91 trans/sec
Throughput:                     3.96 MB/sec
Concurrency:                    2.06
Successful transactions:        9900
Failed transactions:               0
Longest transaction:            3.03
Shortest transaction:           0.00

3.1.2：nginx不开启页面缓存的情况
Transactions:                  10000 hits
Availability:                 100.00 %
Elapsed time:                  63.90 secs
Data transferred:             266.10 MB
Response time:                  0.01 secs
Transaction rate:             156.49 trans/sec
Throughput:                     4.16 MB/sec
Concurrency:                    2.18
Successful transactions:        9900
Failed transactions:               0
Longest transaction:            0.35
Shortest transaction:           0.00

3.1.3：nginx开启页面缓存第二次测试的情况
Transactions:                  10000 hits
Availability:                 100.00 %
Elapsed time:                  63.05 secs
Data transferred:             266.10 MB
Response time:                  0.01 secs
Transaction rate:             158.60 trans/sec
Throughput:                     4.22 MB/sec
Concurrency:                    2.06
Successful transactions:        9900
Failed transactions:               0
Longest transaction:            0.34
Shortest transaction:           0.00

3.2.1：varnish清空缓存第一次测试情况
Transactions:                  10000 hits
Availability:                 100.00 %
Elapsed time:                  62.87 secs
Data transferred:             266.10 MB
Response time:                  0.01 secs
Transaction rate:             159.06 trans/sec
Throughput:                     4.23 MB/sec
Concurrency:                    1.95
Successful transactions:        9900
Failed transactions:               0
Longest transaction:            0.37
Shortest transaction:           0.00

3.2.2：varnish有缓存测试
Transactions:                  10000 hits
Availability:                 100.00 %
Elapsed time:                  61.91 secs
Data transferred:             266.10 MB
Response time:                  0.01 secs
Transaction rate:             161.52 trans/sec
Throughput:                     4.30 MB/sec
Concurrency:                    1.78
Successful transactions:        9900
Failed transactions:               0
Longest transaction:            0.34
Shortest transaction:           0.00

3.2.3：varnish负责均衡性能
Transactions:                  10000 hits
Availability:                 100.00 %
Elapsed time:                  59.75 secs
Data transferred:             266.10 MB
Response time:                  0.01 secs
Transaction rate:             167.36 trans/sec
Throughput:                     4.45 MB/sec
Concurrency:                    1.98
Successful transactions:        9900
Failed transactions:               0
Longest transaction:            3.01
Shortest transaction:           0.00

     4：结论

• 在varnish机器性能较差的情况下，在高并发情况下，能够跑出比nginx更好的性能。
• 线上是读取了单台图片服务器，使用varnish能够解决图片服务负责均衡的问题，减少了nginx对内存的存储双份造成浪费的问题。
• 有varnish负载均衡，单台img服务器故障时能让服务继续。当然varnish故障了，需要有备份服务器。