Ubuntu Manpages

sched_ule

ULE scheduler

options SCHED_ULE

The sched_ule scheduler provides a number of advanced scheduler features not present in sched_4bsd(4), the traditional system scheduler. These features address SMP and interactivity and include:

  • Thread CPU affinity.
  • CPU topology awareness, including for hyper-threading.
  • Per-CPU run queues.
  • Interactivity heuristics that detect interactive applications and schedules them preferentially under high load.

The following sysctls are relevant to the operation of sched_ule:

kern.sched.name
This read-only sysctl reports the name of the active scheduler.
kern.sched.quantum
This read-write sysctl reports or sets the length of the quantum (in micro-seconds) granted to a thread.

sched_4bsd(4), sysctl(8)

The sched_ule scheduler first appeared in FreeBSD 5.1.

Jeff Roberson <jeff@FreeBSD.org>