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chrt - Online in the Cloud

Run chrt in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command chrt that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



chrt - manipulate the real-time attributes of a process


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


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

The SCHED_BATCH policy is supported since Linux 2.6.16. The SCHED_IDLE policy is
supported since Linux 2.6.23.

The SCHED_RESET_ON_FORK flag for policies SCHED_RR and SCHED_FIFO is supported since Linux


-a, --all-tasks
Set or retrieve the scheduling attributes of all the tasks (threads) for a given

-b, --batch
Set scheduling policy to SCHED_BATCH (Linux-specific). The priority argument has to
be set to zero.

-f, --fifo
Set scheduling policy to SCHED_FIFO.

-i, --idle
Set scheduling policy to SCHED_IDLE (Linux-specific). The priority argument has to
be set to zero.

-m, --max
Show minimum and maximum valid priorities, then exit.

-o, --other
Set policy scheduling policy to SCHED_OTHER.

-p, --pid
Operate on an existing PID and do not launch a new task.

-R, --reset-on-fork
Add SCHED_RESET_ON_FORK flag to the SCHED_FIFO or SCHED_RR scheduling policy

-r, --rr
Set scheduling policy to SCHED_RR. When policy is not defined the SCHED_RR is used
as default.

-v, --verbose
Show status information.

-V, --version
Display version information and exit.

-h, --help
Display help text and exit.


The default behavior is to run a new command:
chrt priority command [arguments]

You can also retrieve the real-time attributes of an existing task:
chrt -p pid

Or set them:
chrt -r -p priority pid


A user must possess CAP_SYS_NICE to change the scheduling attributes of a process. Any
user can retrieve the scheduling information.


Only SCHED_FIFO, SCHED_OTHER and SCHED_RR are part of POSIX 1003.1b Process Scheduling.
The other scheduling attributes may be ignored on some systems.

Linux default scheduling policy is SCHED_OTHER.

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