Copyright (c) 2005 Robert N. M. Watson
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$FreeBSD$
.Dd August 10, 2012 .Dt SCHED_ULE 4 .Os .Sh NAME .Nm sched_ule .Nd ULE scheduler .Sh SYNOPSIS .Cd "options SCHED_ULE" .Sh DESCRIPTION The .Nm scheduler provides a number of advanced scheduler features not present in .Xr sched_4bsd 4 , the traditional system scheduler. These features address SMP and interactivity and include:
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$FreeBSD$
.Dd August 10, 2012 .Dt SCHED_ULE 4 .Os .Sh NAME .Nm sched_ule .Nd ULE scheduler .Sh SYNOPSIS .Cd "options SCHED_ULE" .Sh DESCRIPTION The .Nm scheduler provides a number of advanced scheduler features not present in .Xr sched_4bsd 4 , the traditional system scheduler. These features address SMP and interactivity and include:
p l -bullet -compact -offset indent t Thread CPU affinity. t CPU topology awareness, including for hyper-threading. t Per-CPU run queues. t Interactivity heuristics that detect interactive applications and schedules them preferentially under high load. .El
p The following sysctls are relevant to the operation of .Nm : l -tag -width indent t Va kern.sched.name This read-only sysctl reports the name of the active scheduler. t Va kern.sched.quantum This read-write sysctl reports or sets the length of the quantum (in micro-seconds) granted to a thread. .El .Sh SEE ALSO .Xr sched_4bsd 4 , .Xr sysctl 8 .Sh HISTORY The .Nm scheduler first appeared in .Fx 5.1 . .Sh AUTHORS .An Jeff Roberson .Aq jeff@FreeBSD.org