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。本文将分享OpCache配置实例，希望对大家有所帮助。
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
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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 "http://112.126.69.14/main.php?a=Role&m=createRole"
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 112.126.69.14 (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
Completed 6000 requests
Completed 7000 requests
Completed 8000 requests
Completed 9000 requests
Completed 10000 requests
Finished 10000 requests
Server Software: openresty/1.7.2.1
Server Hostname: 112.126.69.14
Server Port: 80
Document Path: /main.php?a=Role&m=createRole
Document Length: 2 bytes
Concurrency Level: 200
Time taken for tests: 26.061 seconds
Complete requests: 10000
Failed requests: 20
(Connect: 0, Receive: 0, Length: 20, Exceptions: 0)
Write errors: 0
Non-2xx responses: 20
Total transferred: 1713580 bytes
HTML transferred: 23520 bytes
Requests per second: 383.72 [#/sec] (mean)
Time per request: 521.216 [ms] (mean)
Time per request: 2.606 [ms] (mean, across all concurrent requests)
Transfer rate: 64.21 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 2 3 3.2 2 60
Processing: 17 461 905.0 219 16496
Waiting: 17 461 904.9 219 16496
Total: 21 464 905.0 222 16502
Percentage of the requests served within a certain time (ms)
50% 222
66% 271
75% 369
80% 412
90% 805
95% 1248
98% 2597
99% 3489
100% 16502 (longest request)登录后复制
开启之后的数据：
[root@localhost ~]# ab -n 10000 -c 200 "http://112.126.69.14/main.php?a=Role&m=createRole"
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
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)登录后复制
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