PHP开启opcache提升代码性能

配置指令如下：

[opcache]zend_extension=opcache.soopcache.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 "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 requestsCompleted 2000 requestsCompleted 3000 requestsCompleted 4000 requestsCompleted 5000 requestsCompleted 6000 requestsCompleted 7000 requestsCompleted 8000 requestsCompleted 9000 requestsCompleted 10000 requestsFinished 10000 requestsServer Software:openresty/1.7.2.1Server Hostname:112.126.69.14Server Port:80Document Path: /main.php?a=Role&m=createRoleDocument Length:2 bytesConcurrency Level: 200Time taken for tests:26.061 secondsComplete requests: 10000Failed requests:20（Connect: 0, Receive: 0, Length: 20, Exceptions: 0）Write errors:0Non-2xx responses: 20Total transferred: 1713580 bytesHTML transferred:23520 bytesRequests 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] receivedConnection Times （ms） min mean[+/-sd] medianmaxConnect:233.2 2 60Processing:17 461 905.021916496Waiting:17 461 904.921916496Total: 21 464 905.022216502Percentage 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 "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 requestsCompleted 2000 requestsCompleted 3000 requestsCompleted 4000 requestsCompleted 5000 requestsCompleted 6000 requestsCompleted 7000 requestsCompleted 8000 requestsCompleted 9000 requestsCompleted 10000 requestsFinished 10000 requestsServer Software:openresty/1.7.2.1Server Hostname:112.126.69.14Server Port:80Document Path: /main.php?a=Role&m=createRoleDocument Length:2 bytesConcurrency Level: 200Time taken for tests:14.237 secondsComplete requests: 10000Failed requests:0Write errors:0Total transferred: 1711710 bytesHTML transferred:20020 bytesRequests 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] receivedConnection Times （ms） min mean[+/-sd] medianmaxConnect:266 272.6 23005Processing: 4 176 666.4 69026Waiting:4 163 642.8 69026Total: 6 242 745.7 910028Percentage 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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