NAME¶

sched_ule — ULE scheduler

SYNOPSIS¶

options SCHED_ULE

DESCRIPTION¶

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.

SEE ALSO¶

sched_4bsd(4), sysctl(8)

HISTORY¶

The sched_ule scheduler first appeared in FreeBSD 5.1.

AUTHORS¶

Jeff Roberson <jeff@FreeBSD.org>