DragonFly On-Line Manual Pages

USCHED(8)              DragonFly System Manager's Manual             USCHED(8)

NAME
     usched -- run a program with a specified userland scheduler and cpumask

SYNOPSIS
     usched [-d] {scheduler[:cpumask] | :cpumask} program [argument ...]

DESCRIPTION
     Run program using the specified userland scheduler on CPUs given in
     cpumask.  It assigns the program to the CPU with the smallest cpuid and
     adds the rest of the CPUs to the list of available CPUs for the program.
     The userland scheduler can have value `bsd4' or `dfly'.  If scheduler is
     not specified, userland scheduler is inherited from parent process
     (usched).

     The following options are available:

     -d      Add debug output.

     usched is only usable for super user as other users cannot change
     userland scheduler or cpumask.

     System default userland scheduler can be changed in loader.conf(5), see
     loader(8).

EXIT STATUS
     The usched utility exits 0 on success, and >0 if an error occurs.

EXAMPLES
     Run sh(1) using only first 3 CPUs.

           usched :7 sh

     Run sh(1) using userland scheduler `bsd4' using only first 4 CPUs.

           usched bsd4:0xf sh

SEE ALSO
     usched_set(2), loader.conf(5), loader(8)

HISTORY
     The usched utility first appeared in DragonFly 3.1.

AUTHORS
     Matthew Dillon <dillon@backplane.com>
     Thomas Nikolajsen <thomas.nikolajsen@mail.dk>

BUGS
     Using system default userland scheduler by specifying scheduler as
     `default' is not implemented.

     cpumask only supports up to 64 CPUs due to implementation of usched.

DragonFly 4.5                  October 21, 2012                  DragonFly 4.5