PHP开启opcache提升代码性能

APC在PHP5.4及以下版本是性能最好的代码缓存。不过PHP升级到5.5及以上后，APC不再有效。需要使用Zend的OpCache扩展。

配置指令如下：

[opcache]

zend_extension=opcache.so

opcache.enable_cli=1

;共享内存大小, 这个根据你们的需求可调

opcache.memory_consumption=256

;interned string的内存大小, 也可调

opcache.interned_strings_buffer=8

;最大缓存的文件数目

opcache.max_accelerated_files=4000

;60s检查一次文件更新

opcache.revalidate_freq=60

;打开快速关闭, 打开这个在PHP Request Shutdown的时候 会收内存的速度会提高

opcache.fast_shutdown=1

;不保存文件/函数的注释

opcache.save_comments=0

实际性能对比：

下面是实际测试中没有开启opcache的数据：

[root@localhost ~]# ab -n 10000 -c 200 ""

This is ApacheBench, Version 2.3 <$Revision: 655654 $>

Copyright 1996 Adam Twiss, Zeus Technology Ltd,

Licensed to The Apache Software Foundation,

Benchmarking 112.126.69.14 (be patient)

Completed 1000 requests

Completed 2000 requests

Completed 3000 requests

Completed 4000 requests

Completed 5000 requests

Completed 6000 requests

Completed 7000 requests

Completed 8000 requests

Completed 9000 requests

Completed 10000 requests

Finished 10000 requests

Server Software: openresty/1.7.2.1

Server Hostname: 112.126.69.14

Server Port: 80

Document Path: /main.php?a=Role&m=createRole

Document Length: 2 bytes

Concurrency Level: 200

Time taken for tests: 26.061 seconds

Complete requests: 10000

Failed requests: 20

(Connect: 0, Receive: 0, Length: 20, Exceptions: 0)

Write errors: 0

Non-2xx responses: 20

Total transferred: 1713580 bytes

HTML transferred: 23520 bytes

Requests per second: 383.72 [#/sec] (mean)

Time per request: 521.216 [ms] (mean)

Time per request: 2.606 [ms] (mean, across all concurrent requests)

Transfer rate: 64.21 [Kbytes/sec] received

Connection Times (ms)

min mean[+/-sd] median max

Connect: 2 3 3.2 2 60

Processing: 17 461 905.0 219 16496

Waiting: 17 461 904.9 219 16496

Total: 21 464 905.0 222 16502

Percentage of the requests served within a certain time (ms)

50% 222

66% 271

75% 369

80% 412

90% 805

95% 1248

98% 2597

99% 3489

100% 16502 (longest request)

开启之后的数据：

[root@localhost ~]# ab -n 10000 -c 200 ""

This is ApacheBench, Version 2.3 <$Revision: 655654 $>

Copyright 1996 Adam Twiss, Zeus Technology Ltd,

Licensed to The Apache Software Foundation,

Benchmarking 112.126.69.14 (be patient)

Completed 1000 requests

Completed 2000 requests

Completed 3000 requests

Completed 4000 requests

Completed 5000 requests

Completed 6000 requests

Completed 7000 requests

Completed 8000 requests

Completed 9000 requests

Completed 10000 requests

Finished 10000 requests

Server Software: openresty/1.7.2.1

Server Hostname: 112.126.69.14

Server Port: 80

Document Path: /main.php?a=Role&m=createRole

Document Length: 2 bytes

Concurrency Level: 200

Time taken for tests: 14.237 seconds

Complete requests: 10000

Failed requests: 0

Write errors: 0

Total transferred: 1711710 bytes

HTML transferred: 20020 bytes

Requests per second: 702.40 [#/sec] (mean)

Time per request: 284.739 [ms] (mean)

Time per request: 1.424 [ms] (mean, across all concurrent requests)

Transfer rate: 117.41 [Kbytes/sec] received

Connection Times (ms)

min mean[+/-sd] median max

Connect: 2 66 272.6 2 3005

Processing: 4 176 666.4 6 9026

Waiting: 4 163 642.8 6 9026

Total: 6 242 745.7 9 10028

Percentage of the requests served within a certain time (ms)

50% 9

66% 14

75% 99

80% 122

90% 1006

95% 1476

98% 2853

99% 3543

100% 10028 (longest request)

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