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                ## 背景介紹 [XCache][1] 是一個開源的 opcode 緩存器/優化器, 這意味著他能夠提高您服務器上的 PHP 性能. 他通過把編譯 PHP 后的數據緩沖到共享內存從而避免重復的編譯過程, 能夠直接使用緩沖區已編譯的代碼從而提高速度. 通常能夠提高您的頁面生成速率 **2 到5** 倍, 降低服務器負載。 ### yum安裝 ~~~ yum install -y php-xcache ~~~ ### 編譯安裝 ~~~ # tar xf xcache-3.1.tar.bz2 # cd xcache-3.1 # 獲取php的配置信息 # /usr/local/php/bin/phpize # ./configure # ./configure --enable-xcache --with-php-config=/usr/local/php/bin/php-config # make && make install Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-zts-20121212/ ~~~ 不用指定安裝prefix,會默認安裝到php的目錄中 ### 整合php和xcache 首先將xcache提供的樣例配置導入php.ini ~~~ # cp xcache.ini /etc/php.d ~~~ 說明:xcache.ini文件在xcache的源碼目錄中。 接下來編輯/etc/php.d/xcache.ini,找到zend_extension開頭的行,修改為如下行,不同xcache版本略有不同 #### xcache3.0.0 ~~~ [xcache-common] zend_extension = /usr/local/php/lib/php/extensions/no-debug-zts-20100525/xcache.so ~~~ #### xcache3.1 ~~~ [xcache-common] extension = /usr/local/php/lib/php/extensions/no-debug-zts-20121212/xcache.so ~~~ >[danger] 注意:如果php.ini文件中有多條zend_extension指令行,要確保此新增的行排在第一位。 #### xcache3.2 ~~~ [xcache-common] extension = "xcache.so" ~~~ 此處不用修改 ### 配置文件說明 ~~~ [xcache] ; ini only settings, all the values here is default unless explained ; select low level shm implemenation xcache.shm_scheme = "mmap" #shm=shared memory共享內存 mmap=memory map 內存映射,一段內存可以讓多個進程同時訪問 ; to disable: xcache.size=0 ; to enable : xcache.size=64M etc (any size > 0) and your system mmap allows xcache.size = 60M ; set to cpu count (cat /proc/cpuinfo |grep -c processor) xcache.count = 1 ; just a hash hints, you can always store count(items) > slots xcache.slots = 8K ; ttl of the cache item, 0=forever 生存周期,過期時間 xcache.ttl = 0 ; interval of gc scanning expired items, 0=no scan, other values is in seconds xcache.gc_interval = 0 ~~~ #gc:grabage colletion垃圾回收,0代表不掃描;掃描也會帶來系統開銷 ### 測試 在index.php中添加phpinfo();并測試查看xcache是有已啟動 ![](http://om4h63cja.bkt.clouddn.com/17-6-16/61014530.jpg) [1]:http://xcache.lighttpd.net/wiki/ReleaseArchive
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