ionice — Get or set program I/O scheduling class and priority. Scheduling classes: 1 (realtime), 2 (best-effo

Run a command with the given scheduling class and priority

ionice {{[-c|--class]}} {{scheduling_class}} {{[-n|--classdata]}} {{priority}} {{command}}

Set I/O scheduling class of a running process with a specific [p]id, [P]gid, or [u]id

ionice {{[-c|--class]}} {{scheduling_class}} -{{p|P|u}} {{id}}

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

ionice {{[-c|--class]}} {{scheduling_class}} {{[-n|--classdata]}} {{priority}} {{command}}

Ignore failure to set the requested priority

ionice {{[-t|--ignore]}} {{[-n|--classdata]}} {{priority}} {{[-p|--pid]}} {{pid}}

Run the command even in case it was not possible to set the desired priority (this can happen due to insufficient privileges or an old kernel version)

ionice {{[-t|--ignore]}} {{[-n|--classdata]}} {{priority}} {{[-p|--pid]}} {{pid}}