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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).

Set I/O scheduling class of a running process

ionice -c {{scheduling_class}} -p {{pid}}

Run a command with altered 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}}