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XCache 是一个又快又稳定的 PHP opcode 缓存器. 经过良好的测试并在大流量/高负载的生产机器上稳定运行. 经过(在 linux 上)测试并支持所有现行 PHP 分支的最新发布版本, 如 PHP_5_1 PHP_5_2 PHP_5_3 PHP_5_4. 并完美支持线程安全/Windows. 与同类 opcode 缓存器相比更胜一筹, 比如能够快速跟进 PHP 版本.
我的php为5.6.6版本，所以需要安装xcache3.2.0
官网下载：http://xcache.lighttpd.net/
tar zxvf xcache-3.2.0.tar.gz cd xcache-3.2.0 /usr/local/php/bin/phpize ./configure --enable-xcache --with-php-config=/usr/local/php/bin/php-config # make install Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20131226/安装完成后会在上面的路径下生成xcache.so 文件；
php.ini文件加入xcache代码段（原文件为/usr/local/src/xcache-3.2.0/xcache.ini）
# vi /usr/local/php/etc/php.ini [xcache-common] extension = xcache.so [xcache.admin] xcache.admin.enable_auth = On xcache.admin.user = "xcache" xcache.admin.pass = "" [xcache] xcache.shm_scheme ="mmap" xcache.size=60M xcache.count =1 xcache.slots =8K xcache.ttl=0 xcache.gc_interval =0 xcache.var_size=4M xcache.var_count =1 xcache.var_slots =8K xcache.var_ttl=0 xcache.var_maxttl=0 xcache.var_gc_interval =300 xcache.test =Off xcache.readonly_protection = On xcache.mmap_path ="/tmp/xcache" xcache.coredump_directory ="" xcache.cacher =On xcache.stat=On xcache.optimizer =Off [xcache.coverager] xcache.coverager =On xcache.coveragedump_directory =""保存退出后，重启apache，php -v 查看是否有xcache信息；
# /usr/local/php/bin/php -v PHP 5.6.6 (cli) (built: Jun 29 2015 17:23:08) Copyright (c) 1997-2015 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies with XCache v3.2.0, Copyright (c) 2005-2014, by mOo with XCache Cacher v3.2.0, Copyright (c) 2005-2014, by mOo或phpinfo.php 浏览器中查看；
xcache状态查询：
创建一个缓存文件：touch /tmp/xcache
拷贝xcache3.2.0目录下htdocs目录到你自己的网站目录下，自定义目录名为xcache；
# cp -r htdocs/ /data/www/blog/xcache/
生成md5密码，复制密码拷贝到刚才php.ini文件xcache.admin.pass="" 引号中。
# echo -n '123456' |md5sum
e10adc3949ba59abbe56e057f20f883e
在浏览器访问 www.star.com/xcache/，弹出认证框输入用户名和密码访问；
ab压力测试进行对比：未安装xcache与安装xcache
使用DELL R420真机(使用discuz论坛首页测试)
在另一台机器上，使用ab压力测试；未安装xcache，3000次并发为118； 3万次并发为74-94之间；
[root@localhost ~]# ab -n 3000 -c 100 www.yong.com/forum.php This is ApacheBench, Version 2.3 <$Revision: 655654 $> Server Software: Apache Server Hostname: www.yong.com Server Port: 80 Document Path: /forum.php Document Length: 13222 bytes Concurrency Level: 100 Time taken for tests: 25.247 seconds Complete requests: 3000 Failed requests: 0 Write errors: 0 Total transferred: 42018000 bytes HTML transferred: 39666000 bytes Requests per second: 118.82 [#/sec] (mean) #每秒处理的请求数 Time per request: 841.579 [ms] (mean) Time per request: 8.416 [ms] (mean, across all concurrent requests) Transfer rate: 1625.25 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 1 4 9.0 2 85 Processing: 66 827 441.1 967 2003 Waiting: 55 812 437.8 953 1992 Total: 68 831 442.2 970 2031 Percentage of the requests served within a certain time (ms) 50% 970 66% 1085 75% 1147 80% 1187 90% 1295 95% 1411 98% 1680 99% 1791 100% 2031 (longest request)可以查看日志记录也是3000条
[root@localhost logs]# cat yong.com-access_log_20150820.log|wc -l 3000请求为3万次，测试结果如下：
[root@localhost ~]# ab -n 30000 -c 100 www.yong.com/forum.php Server Software: Apache Server Hostname: www.yong.com Server Port: 80 Document Path: /forum.php Document Length: 13222 bytes Concurrency Level: 100 Time taken for tests: 402.065 seconds Complete requests: 30000 Failed requests: 2 (Connect: 0, Receive: 0, Length: 2, Exceptions: 0) Write errors: 0 Total transferred: 420614188 bytes HTML transferred: 397069884 bytes Requests per second: 74.61 [#/sec] (mean) Time per request: 1340.216 [ms] (mean) Time per request: 13.402 [ms] (mean, across all concurrent requests) Transfer rate: 1021.62 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 1 170 639.2 4 7553 Processing: 60 1161 1108.3 1037 9234 Waiting: 54 911 534.1 975 7633 Total: 63 1331 1406.5 1068 12650 Percentage of the requests served within a certain time (ms) 50% 1068 66% 1208 75% 1323 80% 1482 90% 2672 95% 4181 98% 6083 99% 7630 100% 12650 (longest request)系统负载，高达到88
开启xcache缓存后，3000次请求并发为368；3万次请求并发为103；系统负载高只有2-4；
[root@localhost ~]# ab -n 3000 -c 100 http://www.yong.com/forum.php Server Software: Apache Server Hostname: www.yong.com Server Port: 80 Document Path: /forum.php Document Length: 12579 bytes Concurrency Level: 100 Time taken for tests: 8.132 seconds Complete requests: 3000 Failed requests: 8 (Connect: 0, Receive: 0, Length: 8, Exceptions: 0) Total transferred: 39787499 bytes HTML transferred: 37732203 bytes Requests per second: 368.90 [#/sec] (mean) Time per request: 271.079 [ms] (mean) Time per request: 2.711 [ms] (mean, across all concurrent requests) Transfer rate: 4777.81 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 1 36 29.8 27 141 Processing: 27 230 112.0 222 919 Waiting: 17 196 104.1 178 864 Total: 31 266 107.4 252 951 Percentage of the requests served within a certain time (ms) 50% 252 66% 298 75% 333 80% 352 90% 398 95% 452 98% 518 99% 592 100% 951 (longest request)请求为3万次，测试结果如下：
每次ab压力测试的结果都不太准确，在虚拟机测试结果更不靠谱。特意找的真机测试，除了负载较高，内存使用竟然没太大变化；只能做参考用；
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