chrt - Linux


chrt is a command used to set or change scheduling attributes of a running process or a command about to be executed. It is primarily used to adjust the scheduling policy and priority of the target process, enabling finer control over CPU resource allocation.


chrt [options] [priority] [command] [args]


  • priority: The scheduling priority, expressed as a numeric value from -20 (lowest) to 19 (highest). Default: 0
  • command: The command to execute with the specified scheduling attributes


  • -p: Specify priority explicitly
  • -i: Set priority of the calling process
  • -f: Apply the attributes to a future process (must be followed by a command)
  • -e: Display effective priority
  • -d: Display current scheduling policy
  • -m: Modify current scheduling policy


Increase the priority of the current process:

chrt -p 10

Run a new command with a specific priority:

chrt -p 15 taskmanager

Set the priority of a future process:

chrt -f 5 firefox

Display the effective priority of a process:

chrt -e 4007

Common Issues

  • Permission denied: Ensure the user has sufficient privileges to adjust process scheduling.
  • Invalid priority: The specified priority must be within the range of -20 to 19.
  • Process not found: Verify that the process you’re trying to modify is still running.


chrt can be used in conjunction with other tools for advanced task management:**

  • nice: Adjust the static priority of a process
  • ionice: Control the I/O scheduling priority of a process
  • top: Monitor process priorities and CPU usage

Related Commands

  • nice
  • renice
  • ps