chrt

Display scheduling attributes of a process

$ chrt -p PID

$ chrt -a -p PID

$ chrt -m

$ chrt -p priority PID

$ chrt --fifo -p priority PID

$ chrt --rr -p priority PID

$ chrt --idle 0 command

chrt [options] priority command [argument...]
chrt [options] -p [priority] PID

chrt sets or retrieves the real-time scheduling attributes of an existing process, or runs a command with specified scheduling attributes. It supports various Linux scheduling policies including FIFO, round-robin, batch, idle, and deadline.
Real-time scheduling policies (SCHEDFIFO, SCHEDRR) give processes priority over normal tasks, which is critical for time-sensitive applications like audio processing, industrial control, and high-frequency trading. Non-real-time policies (SCHEDBATCH, SCHEDIDLE) are useful for background workloads that should yield to interactive processes.
The tool is part of the util-linux package and operates via the sched_setscheduler(2) and sched_setattr(2) system calls.

-p, --pid

Operate on an existing PID without launching a new task

Set or retrieve scheduling attributes for all threads of a PID

Show minimum and maximum valid priorities for each policy

Show status information

Children do not inherit privileged scheduling policies

Set SCHED_OTHER policy (default Linux time-sharing)

Set SCHED_FIFO policy (first in-first out)

Set SCHED_RR policy (round-robin, default when no policy given)

Set SCHED_BATCH policy for batch processing (priority must be 0)

Set SCHED_IDLE policy for very low priority tasks (priority must be 0)

Set SCHED_DEADLINE policy for sporadic deadline scheduling (priority must be 0)

Users require CAPSYSNICE capability to modify scheduling attributes. SCHEDBATCH, SCHEDIDLE, and SCHEDDEADLINE policies require priority 0. Only SCHEDFIFO, SCHEDOTHER, and SCHEDRR are part of POSIX 1003.1b.

chrt is part of the util-linux package, providing real-time process scheduling control since Linux 2.6.

nice(1), renice(1), taskset(1), sched(7)