iowait is simply a form of idle time when nothing could be scheduled. The value may or may not be useful in indicating a performance problem, but it does tell the user that the system is idle and could have taken more work. Comments: A CPU can be in one of four states: user, sys, idle, or iowait.

What is CPU wait time?

CPU wait is a somewhat broad and nuanced term for the amount of time that a task has to wait to access CPU resources. This term is popularly used in virtualized environments, where multiple virtual machines compete for processor resources.

What is wait time in Linux?

wait is a built-in command of Linux that waits for completing any running process. … If wait command is executed this time, then it will be applied for the last command. If no process id or job id is given with wait command then it will wait for all current child processes to complete and returns exit status.