如果可以从内存缓存中获取文件，就可以降低平均服务时间，因此增加服务器每秒能够处理的连接数。
If files can be served from memory cache, then that decreases the average service time, and hence increases the number of connections per second the server can handle.
为了实现这个目的，我们定义一个文件是否修改过为本地时间戳大于等于远程服务器上的时间戳。
For our purposes, we define a file as having changed if the local timestamp is greater than or equal to the timestamp on the remote server.
这些任务包括轮转日志文件以避免装满文件系统、备份数据和连接时间服务器来执行系统时间同步。
These include rotating log files so filesystems do not become full, backing up data, and connecting to a time server to keep your system time synchronized.
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