linux - 如何获取系统ioWait

Question

我如何获得系统 ioWait？这最好通过使用/proc 接口(interface)的信息(我猜它写在那里的某个地方)这样应用程序可以检测到这一点，但是从我的应用程序对 exec() 的外部调用是可以接受的。

Answer 1

这在 /proc/stat 中可用。

来自内核源代码中的文档:

The very first "cpu" line aggregates the numbers in all of the other "cpuN" lines. These numbers identify the amount of time the CPU has spent performing different kinds of work. Time units are in USER_HZ (typically hundredths of a second). The meanings of the columns are as follows, from left to right:

• user: normal processes executing in user mode
• nice: niced processes executing in user mode
• system: processes executing in kernel mode
• idle: twiddling thumbs
• iowait: waiting for I/O to complete
• irq: servicing interrupts
• softirq: servicing softirqs
• steal: involuntary wait