什么是suphp？

我在CentOS 5机器上inheritance了运行Apache / PHP的Web服务器。 这是一个托pipe服务器，所以我仍然熟悉环境。 这台机器真的没有用户活动，但在“顶部”，我经常看到php进程popup和closures。 虽然PHP的过程是活着的，我看它占CPU的40％左右。 我注意到一个名为“suphp_log”的日志文件，并注意到它正在被写入每3或4秒的条目，如：

[Thu Oct 21 02:56:34 2010] [info] Executing "/home/user/public_html/index.php" as UID 511, GID 511 [Thu Oct 21 02:56:35 2010] [info] Executing "/home/user/public_html/index.php" as UID 511, GID 511 [Thu Oct 21 02:56:37 2010] [info] Executing "/home/user/public_html/index.php" as UID 511, GID 511 [Thu Oct 21 02:56:40 2010] [info] Executing "/home/user/public_html/index.php" as UID 511, GID 511 [Thu Oct 21 02:56:44 2010] [info] Executing "/home/user/public_html/index.php" as UID 511, GID 511 [Thu Oct 21 02:56:44 2010] [info] Executing "/home/user/public_html/index.php" as UID 511, GID 511 [Thu Oct 21 02:56:47 2010] [info] Executing "/home/user/public_html/index.php" as UID 511, GID 511 

我不熟悉suphp，但有没有一些configuration设置或导致它不断阅读index.php文件或东西？ 我如何控制suphp的configuration？ 我认为这是我的系统负载来自哪里。 我能做些什么呢？