在Apache环境下使用 .htaccess 进行URL重写或许已经是一种非常常用的方式;然而,如果URL重写规则比较复杂,使用.htaccess的方式可能会影响到Apache的性能。

测试方式

一个简单的echo语句,分别进行以下测试:

  • allowoverride=none,无rewrite
  • allowoverride=all,无.htaccess
  • allowoverride=all,简单的.htaccess
  • allowoverride=none,简单的rewrite
  • allowoverride=all,复杂的.htaccess
  • allowoverride=none,复杂的rewrite

结果

先说结果,当rewrite规则比较简单时,性能影响不大,17201 vs 19486。

当rewrite规则比较复杂,超过900行,有较多正则表达式,跳转(用来做栏目rewrite),性能变化较大 1497 vs 7108

如果访问的目录路径比较深,在allowoverride开启的情况下,apache需要历遍每一个目录去读取.htaccess,性能的影响理论上会更大,测试数据 15623 vs 17201(7层目录vs根目录)。

当然,在实际应用场景中,相对PHP跟Mysql而言,Apache的这点性能损失可能不算什么;但是,只需要简单的将rewrite规则从htaccess复制到apache.conf中就可以得到性能的提升,何乐而不为呢? :)

测试数据

allowoverride=none,无rewrite

Concurrency Level:      10
Time taken for tests:   0.500 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1880000 bytes
HTML transferred:       10000 bytes
Requests per second:    20008.88 [#/sec] (mean)
Time per request:       0.500 [ms] (mean)
Time per request:       0.050 [ms] (mean, across all concurrent requests)
Transfer rate:          3673.51 [Kbytes/sec] received

allowoverride=all,无.htaccess

Concurrency Level:      10
Time taken for tests:   0.491 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1880000 bytes
HTML transferred:       10000 bytes
Requests per second:    20371.66 [#/sec] (mean)
Time per request:       0.491 [ms] (mean)
Time per request:       0.049 [ms] (mean, across all concurrent requests)
Transfer rate:          3740.11 [Kbytes/sec] received

简单的.htaccess(符合单入口文件类的网站)

Concurrency Level:      10
Time taken for tests:   0.581 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1880000 bytes
HTML transferred:       10000 bytes
Requests per second:    17201.99 [#/sec] (mean)
Time per request:       0.581 [ms] (mean)
Time per request:       0.058 [ms] (mean, across all concurrent requests)
Transfer rate:          3158.18 [Kbytes/sec] received

简单.htaccess,访问 /a/b/c/d/e/f/g/ 路径

Concurrency Level:      10
Time taken for tests:   0.640 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1880000 bytes
HTML transferred:       10000 bytes
Requests per second:    15623.29 [#/sec] (mean)
Time per request:       0.640 [ms] (mean)
Time per request:       0.064 [ms] (mean, across all concurrent requests)
Transfer rate:          2868.34 [Kbytes/sec] received

简单的rewrite规则,写入apache.conf

Concurrency Level:      10
Time taken for tests:   0.513 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1880000 bytes
HTML transferred:       10000 bytes
Requests per second:    19486.15 [#/sec] (mean)
Time per request:       0.513 [ms] (mean)
Time per request:       0.051 [ms] (mean, across all concurrent requests)
Transfer rate:          3577.54 [Kbytes/sec] received

复杂的.htaccess(900行,使用正则表达式对栏目内容进行映射,还有对旧内容的重定向等)

Concurrency Level:      10
Time taken for tests:   6.677 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1880000 bytes
HTML transferred:       10000 bytes
Requests per second:    1497.75 [#/sec] (mean)
Time per request:       6.677 [ms] (mean)
Time per request:       0.668 [ms] (mean, across all concurrent requests)
Transfer rate:          274.98 [Kbytes/sec] received

将规则写入apache.conf,并且禁用allowoverride后:

Concurrency Level:      10
Time taken for tests:   1.407 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1880000 bytes
HTML transferred:       10000 bytes
Requests per second:    7108.94 [#/sec] (mean)
Time per request:       1.407 [ms] (mean)
Time per request:       0.141 [ms] (mean, across all concurrent requests)
Transfer rate:          1305.16 [Kbytes/sec] received