最近准备换VPS，看到有VPS支持FreeBSD，就打算试试。想了解一下它和linux性能上的差异，就在网上找了些文章看了看。很多文章都提到FreeBSD更适合做前端的文件服务器，它的数据库性能和SMP性能不如linux。不过这些文章要么比较老，要么就是纯粹的口水仗，缺乏翔实的数据支撑。于是还是决定自己多装几台虚拟机测试一下好了。
测试环境：
宿主：
Core i3 530 @ 2.93GHz 双核4线程
16G RAM
Windows 7 64bit
虚拟机软件：
Virtualbox 4.1.2
虚拟机配置：
FreeBSD 7.2 i386 / FreeBSD 8.2 amd64 / Debian 5.0 i386 / CentOS 5.6 i386
双核全速
256M RAM
8GB硬盘
启用硬件虚拟化和IO APIC
各系统用最小安装，然后安装了编译工具链+apache（为了方便使用ab）+php+MySQL。之后关掉apache，安装nginx。
FreeBSD使用ports编译安装nginx，Debian分别使用了源自带的和编译的最新稳定版，CentOS使用编译的最新稳定版。FreeBSD的nginx应该默认使用了kqueue，linux默认使用了epoll。
nginx设置为1个worker，开启gzip。
测试使用ApacheBench，测试文件为一个57244 bytes的jquery.js。
除CentOS外，ApacheBench都是2.3版，CentOS是2.0版。
ab -c 10-n 100000 http://localhost/jquery.js
不多废话了，以下是测试结果：
FreeBSD 7.2 i386 + nginx 0.6.36
Concurrency Level:
10
Time taken for tests: 26.156 seconds
Complete requests:
100000
Failed requests:
0
Write errors:
0
Total transferred:
5747200000 bytes
HTML transferred:
5724400000 bytes
Requests per second: 3823.15 [#/sec] (mean)
Time per request:
2.616 [ms] (mean)
Time per request:
0.262 [ms] (mean, across all concurrent requests)
Transfer rate:
214574.53 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect:
0 0 0.2
0
4
Processing:
0 2 0.8
2
18
Waiting:
0 1 0.6
1
16
Total:
0 3 0.7
2
18
FreeBSD 8.2 amd64 + nginx 0.8.54
Concurrency Level:
10
Time taken for tests: 24.675 seconds
Complete requests:
100000
Failed requests:
0
Write errors:
0
Total transferred:
5747257344 bytes
HTML transferred:
5724457116 bytes
Requests per second: 4052.62 [#/sec] (mean)
Time per request:
2.468 [ms] (mean)
Time per request:
0.247 [ms] (mean, across all concurrent requests)
Transfer rate:
227455.77 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect:
0 0 0.2
0
8
Processing:
1 2 0.6
2
19
Waiting:
0 1 0.5
1
9
Total:
1 2 0.6
2
20
Debian 5.0 i386 + nginx 0.6.32
Concurrency Level:
10
Time taken for tests: 9.808 seconds
Complete requests:
100000
Failed requests:
0
Write errors:
0
Total transferred:
5747257472 bytes
HTML transferred:
5724457244 bytes
Requests per second: 10195.98 [#/sec] (mean)
Time per request:
0.981 [ms] (mean)
Time per request:
0.098 [ms] (mean, across all concurrent requests)
Transfer rate:
572254.98 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect:
0 0 0.1
0
10
Processing:
0 1 1.0
1
94
Waiting:
0 0 0.9
0
94
Total:
0 1 1.0
1
95
Debian 5.0 i386 + nginx 1.0.6
Concurrency Level:
10
Time taken for tests: 9.321 seconds
Complete requests:
100000
Failed requests:
0
Write errors:
0
Total transferred:
5747157471 bytes
HTML transferred:
5724457244 bytes
Requests per second: 10728.92 [#/sec] (mean)
Time per request:
0.932 [ms] (mean)
Time per request:
0.093 [ms] (mean, across all concurrent requests)
Transfer rate:
602156.28 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect:
0 0 0.1
0
7
Processing:
0 1 0.4
1
32
Waiting:
0 0 0.4
0
31
Total:
0 1 0.5
1
32
CentOS 5.6 i386 + nginx 1.0.6
Concurrency Level:
10
Time taken for tests: 9.996502 seconds
Complete requests:
100000
Failed requests:
0
Write errors:
0
Total transferred:
1452132704 bytes
HTML transferred:
1429432704 bytes
Requests per second: 10003.50 [#/sec] (mean)
Time per request:
1.000 [ms] (mean)
Time per request:
0.100 [ms] (mean, across all concurrent requests)
Transfer rate:
141859.42 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect:
0 0 0.0
0
3
Processing:
0 0 0.7
0
9
Waiting:
0 0 0.2
0
6
Total:
0 0 0.7
0
9
整理：
和之前看到的很多文章的观点正相反，在nginx静态文件性能的测试中，FreeBSD表现出了巨大的劣势。