PHP缓冲的免费实现方法

由 徐永久 发表于 2002年02月21日 22:56。
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我们知道 Zend 有免费的优化引擎针对 PHP 而作，但是 FreeLAMP 这次采用的是一个叫做 PHP Accelerator 的缓冲产品。
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我们在 “LAMP 加速” 这篇文章中阐述过加速的几种办法，其中提到了 PHP Accelerator，它的安装方法十分简单，但是需要去他的网站获取一个激活键。
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一、下载：
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http://www.php-accelerator.co.uk/download.php
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二、获取激活键并安装：
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http://www.php-accelerator.co.uk/activate.php
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注册自己的 SERVER_NAME 后，你会得到下面的提示：
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Your key for www.freelamp.com is 8edfd13946c96309244fcca309415902
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Now you must set the key for www.freelamp.com in your site configuration.
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For single domains not using virtual hosts
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The key can be set in the php.ini file as follows:
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# PHPA key for www.freelamp.com
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#
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phpa.registration_key = 8edfd13946c96309244fcca309415902
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For domains setup as a virtual host
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Add the key to the domain specific section for your web server.
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# www.freelamp.com VHost entry
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#
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<VirtualHost 10.20.30.40>
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ServerName www.freelamp.com
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# ... (other vhost specific config)
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# php settings
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php_value phpa.registration_key 8edfd13946c96309244fcca309415902
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# also enable phpa if set to off in the php.ini (the default is on)
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php_value phpa 1
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</VirtualHost>
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</code>
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具体的 phpa 值的设置，可以参考软件随带的 CONFIGURATION 文件的配置。
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由于大多数网站是虚拟主机配置，所以，建议采用 php_value phpa. 的方式设置。
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例如：
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php_value phpa.tweaks off
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php_value phpa.cache_dir /tmp
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php_value phpa.file_perms 400
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php_value phpa.ignore_files "/index.php, /a/test.php"
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# php_value phpa.ignore_dirs "/data/WWW/site1/,/cache/"
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php_value phpa.shm_size 8
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php_value phpa.shm_key 0xc0deb00
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php_value phpa.shm_perms 664
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三、设置 php.ini
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假设我们把下载后的文件解开到 /usr/local/php ，那么在 php.ini 中加入：
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zend_extension=/usr/local/php/php_accelerator_1.2p2.so
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并注释掉原来的 Zend 优化引擎：
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# zend_extension=/usr/local/Zend/lib/ZendOptimizer.so
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重新启动 Apache ，用浏览器浏览一个任意 PHP 页面可以看到 /tmp 下面生成了一些 phpa 开头的文件。另外一个检查缓冲是否起作用的办法是看 phpinfo() 的输出，原来的 Zend 优化引擎的说明部分，已经被显示成：
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This program makes use of the Zend scripting Language Engine:
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Zend Engine v1.1.1, Copyright (c) 1998-2001 Zend Technologies
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with the PHP Accelerator v1.2p2, Copyright (c) 2001-2002, by Nick Lindridge
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需要说明的是，安装 INSTALL 安装说明上的办法，其中的 .so 文件和真实的 .so 文件有差异，所以，你在安装的时候需要注意到这个区别。
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四、调整缓冲大小
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PHP Accelerator 提供了缓冲管理命令：
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phpa_cache_admin -mv 观察内存的缓冲情况
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phpa_cache_admin -fv 观察文件的缓冲情况
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phpa_cache_admin -k 设置缓冲大小
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五、总结
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该软件提供的 INSTALL 文件阐述了关于性能上的一些说法，笔者不在这里赘述。
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需要说明的是，FreeLAMP.com 的文章目前不是 PHP 架构的，但是论坛系统是 PHP 架构的，所以性能上的提升只会是论坛系统的提升。
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