I/O Priority Using "ionice"
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- ionice allows us to give priority to I/O generated by certain processes.
- There are 3 level classes - real-time, best-effort and Idle.
- Real-time - gets absolute priorities above others. there are 8
real-time levels. CAN CHOKE ALL OTHER I/O!
- Best-effort - the default class. A longer time-slice is defined for
each level. Default level is 4. Time-slice also affected by process
- Idle - will be allowed I/O access only when the other classes do not
have any pending I/O.
- Can change I/O priority of running processes, or start new processes with
a given priority.