91 lines
2.7 KiB
Groff
91 lines
2.7 KiB
Groff
.\" Copyright (c) 2005 Robert N. M. Watson
|
|
.\" 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 April 7, 2005
|
|
.Os
|
|
.Dt SCHED_ULE 4
|
|
.Sh NAME
|
|
.Nm sched_ule
|
|
.Nd ULE Scheduler
|
|
.Sh SYNOPSIS
|
|
.Cd "options SCHED_ULE"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
scheduler
|
|
is an experimental scheduler that provides a number of advanced scheduler
|
|
features not present in
|
|
.Xr sched_4bsd 4 ,
|
|
the default system scheduler.
|
|
These features address SMP and interactivity and include:
|
|
.Pp
|
|
.Bl -bullet -compact -offset indent
|
|
.It
|
|
Thread CPU affinity.
|
|
.It
|
|
CPU topology awareness, including for hyper-threading.
|
|
.It
|
|
Per-CPU run queues.
|
|
.It
|
|
Interactivity heuristics that detect interactive applications and schedules
|
|
them preferentially under high load.
|
|
.El
|
|
.Pp
|
|
The following sysctls are relevant to the operation of
|
|
.Nm :
|
|
.Bl -tag -width indent
|
|
.It Va kern.sched.name
|
|
This read-only sysctl reports the name of the active scheduler.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Nm
|
|
scheduler
|
|
is disabled by default as it is experimental.
|
|
See the
|
|
.Sx BUGS
|
|
section for more information.
|
|
.Sh SEE ALSO
|
|
.Xr sched_4bsd 4 ,
|
|
.Xr sched_core 4 ,
|
|
.Xr sysctl 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
scheduler first appeared in
|
|
.Fx 5.1 .
|
|
.Sh AUTHORS
|
|
.An Jeff Roberson
|
|
.Aq jeff@FreeBSD.org
|
|
.Sh BUGS
|
|
As an experimental scheduler,
|
|
.Nm
|
|
is not enabled by default due to a number of known issues, including weak
|
|
performance with several known workloads, and reports of instability.
|
|
Deployment of
|
|
.Nm
|
|
in production environments should be done cautiously.
|