Linux System and Performance Monitoring(I/O篇)
2011年02月21日
6.0 I/O 监控介绍
磁盘I/O 子系统是Linux 系统中最慢的部分.这个主要是归于CPU到物理操作磁盘之间距离(译注:盘片旋转以及寻道).如果拿读取磁盘和内存的时间作比较就是分钟级到秒级,这就像7天和7分钟的区别.因此本质上,Linux 内核就是要最低程度的降低I/O 数.本章将诉述内核在磁盘和内存之间处理数据的这个过程中,哪些地方会产生I/O.
6.1 读和写数据
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