XCache是免费的开源软件，安装费时不多却可提供巨大回报。
If you use Linux, your distribution may already include XCache or may make it available to you in a prepackaged form.
如果使用Linux，则其发行版可能已经包含了XCache或者已经将其以预先打包好的格式提供给您。
XCache is free and open source software, takes little time to install and provides a substantial return.
If XCache and XDebug are turbochargers, memcached is a jet engine.
