I have a server that has a really high load. Nothing is jumping out at me in terms of CPU usage, and it's not swapping.
I think it's cause some processes are waiting for disk IO, and I want to see what's waiting.
Is there any programme that'll show me what processes are waiting for IO? I know about iotop
but that shows what's currently doing IO.
Or is this a silly question? (If so explain how 🙂 )
Best Answer
You can use an I/O monitor like iotop, but it will show you only processes or threads with current I/O operations.
If you need to browse processes waiting for I/O, use watch to monitor processes with STAT flag 'D' like below: