ionice

Get or set program I/O scheduling class and priority.

Scheduling classes: 1 (realtime), 2 (best-effort), 3 (idle).

Priority levels: 0 (the highest) - 7 (the lowest).

More information.

• Set I/O scheduling class of a running process:

ionice -c {scheduling_class} -p {pid}

• Run a command with custom I/O scheduling class and priority:

ionice -c {scheduling_class} -n {priority} {command}

• Print the I/O scheduling class and priority of a running process:

ionice -p {pid}

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