Although it offers less accuracy than high-resolution timers, it is ideal for traditional driver time-outs that provide coverage of error cases when dealing with physical devices.
If a wing falls off an airplane, the forensic engineers will look first at where the wing attaches to the airplane: in physical systems, proximity of error to function is frequently high.
如果一个机翼脱落了，工程师首先会查看机翼连接的位置：在物理系统上，错误和功能的临近度通常很高。
3
Even on a single physical server, you can have redundant power supplies, error-correcting RAM, redundant disks, and copious monitoring of pre-fault indicators.