CHRT(1) Linux Users Manual CHRT(1) NAME chrt - manipulate real-time attributes of a process SYNOPSIS chrt [options] prio command [arg]... chrt [options] -p [prio] pid DESCRIPTION chrt(1) 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, or SCHED_BATCH) and priority can be set and retrieved. The SCHED_BATCH policy is supported since Linux 2.6.16. OPTIONS -p, --pid operate on an existing PID and do not launch a new task -b, --batch set scheduling policy to SCHED_BATCH -f, --fifo set scheduling policy to SCHED_FIFO -m, --max show minimum and maximum valid priorities, then exit -o, --other set policy scheduling policy to SCHED_OTHER -r, --rr set scheduling policy to SCHED_RR (the default) -h, --help display usage information and exit -v, --version output version information and exit USAGE The default behavior is to run a new command:: chrt prio command [arguments] You can also retrieve the real-time attributes of an existing task: chrt -p pid Or set them: chrt -p prio pid PERMISSIONS A user must possess CAP_SYS_NICE to change the scheduling attributes of a process. Any user can retrieve the scheduling information. AUTHOR Written by Robert M. Love. COPYRIGHT Copyright 2004 Robert M. Love This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. SEE ALSO taskset(1), nice(1), renice(1) See sched_setscheduler(2) for a description of the Linux scheduling scheme. AVAILABILITY The chrt command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. schedutils Apr 2003 CHRT(1)