priocntl Usage

The priocntl(1) utility performs four different control interfaces on the scheduling of a process:

priocntl -l

Displays configuration information

priocntl -d

Displays the scheduling parameters of processes

priocntl -s

Sets the scheduling parameters of processes

priocntl -e

Executes a command with the specified scheduling parameters

The following examples demonstrate the use of priocntl(1).

• The -l option for the default configuration produces the following output:

  $ priocntl -l CONFIGURED CLASSES ================== SYS (System Class) TS (Time Sharing) Configured TS User Priority Range -60 through 60 RT (Real Time) Maximum Configured RT Priority: 59

• To display information on all processes, do the following:

  $ priocntl -d -i all

• To display information on all time-sharing processes:

  $ priocntl -d -i class TS

• To display information on all processes with user ID 103 or 6626, do the following:

  $ priocntl -d -i uid 103 6626

• To make the process with ID 24668 a real-time process with default parameters, do the following:

  $ priocntl -s -c RT -i pid 24668

• To make 3608 RT with priority 55 and a one-fifth second time slice:

  $ priocntl -s -c RT -p 55 -t 1 -r 5 -i pid 3608

• To change all processes into time-sharing processes, do the following:

  $ priocntl -s -c TS -i all

• To reduce TS user priority and user priority limit to -10 for uid 1122:

  $ priocntl -s -c TS -p -10 -m -10 -i uid 1122

• To start a real-time shell with default real-time priority, do the following:

  $ priocntl -e -c RT /bin/sh

• To run make with a time-sharing user priority of -10, do the following:

  $ priocntl -e -c TS -p -10 make bigprog

priocntl(1) includes the interface of nice(1). nice works only on time-sharing processes and uses higher numbers to assign lower priorities. The previous example is equivalent to using nice(1) to set an increment of 10:

$ nice -10 make bigprog