chrt – manipulate real-time attributes of a process

A UNIX Command

$chrt -m
SCHED_OTHER min/max priority	: 0/0
SCHED_FIFO min/max priority	: 1/99
SCHED_RR min/max priority	: 1/99
SCHED_BATCH min/max priority	: 0/0
SCHED_IDLE min/max priority	: 0/0
$chrt -b  -p 0 4555
$chrt -p 4555
pid 4555's current scheduling policy: SCHED_BATCH
pid 4555's current scheduling priority: 0
$chrt -o  -p 0 4555
$chrt -p 4555
pid 4555's current scheduling policy: SCHED_OTHER
pid 4555's current scheduling priority: 0
$

UNIX Explanation

chrt   sets  or retrieves the real-time scheduling
attributes of an existing PID or runs COMMAND with
the given attributes.  Both policy (one of SCHED_OTHER,
SCHED_FIFO, SCHED_RR, SCHED_BATCH, or SCHED_IDLE)
and priority can be set and retrieved.