229 lines
6.8 KiB
Groff
229 lines
6.8 KiB
Groff
.\" Copyright (c) 2008 Christian Brueffer
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.\" Copyright (c) 2008 Jeffrey Roberson
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 3, 2018
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.Dt CPUSET 1
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.Os
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.Sh NAME
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.Nm cpuset
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.Nd "configure processor sets"
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.Sh SYNOPSIS
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.Nm
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.Op Fl l Ar cpu-list
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.Op Fl n Ar policy:domain-list
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.Op Fl s Ar setid
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.Ar cmd ...
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.Nm
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.Op Fl l Ar cpu-list
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.Op Fl n Ar policy:domain-list
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.Op Fl s Ar setid
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.Fl p Ar pid
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.Nm
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.Op Fl c
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.Op Fl l Ar cpu-list
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.Op Fl n Ar policy:domain-list
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.Fl C
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.Fl p Ar pid
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.Nm
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.Op Fl c
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.Op Fl l Ar cpu-list
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.Op Fl n Ar policy:domain-list
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.Op Fl j Ar jail | Fl p Ar pid | Fl t Ar tid | Fl s Ar setid | Fl x Ar irq
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.Nm
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.Fl g
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.Op Fl cir
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.Op Fl d Ar domain | Fl j Ar jail | Fl p Ar pid | Fl t Ar tid | Fl s Ar setid | Fl x Ar irq
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.Sh DESCRIPTION
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The
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.Nm
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command can be used to assign processor sets to processes, run commands
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constrained to a given set or list of processors and memory domains, and query
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information about processor binding, memory binding and policy, sets, and
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available processors and memory domains in the system.
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.Pp
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.Nm
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requires a target to modify or query.
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The target may be specified as a command, process id, thread id, a
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cpuset id, an irq, a jail, or a NUMA domain.
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Using
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.Fl g
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the target's set id or mask may be queried.
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Using
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.Fl l
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or
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.Fl s
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the target's CPU mask or set id may be set.
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If no target is specified,
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.Nm
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operates on itself.
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Not all combinations of operations and targets are supported.
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For example,
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you may not set the id of an existing set or query and launch a command
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at the same time.
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.Pp
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There are two sets applicable to each process and one private mask per thread.
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Every process in the system belongs to a cpuset.
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By default processes are started in set 1.
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The mask or id may be queried using
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.Fl c .
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Each thread also has a private mask of CPUs it is allowed to run
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on that must be a subset of the assigned set.
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And finally, there is a root set, numbered 0, that is immutable.
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This last set is the list of all possible CPUs in the system and is
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queried using
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.Fl r .
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.Pp
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Most sets include NUMA memory domain and policy information. This can be
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inspected with
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.Fl g
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and set with
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.Fl n .
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This will specify which NUMA domains are visible to the process and
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affect where anonymous memory and file pages will be stored on first access.
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Files accessed first by other processes may specify conflicting policy.
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.Pp
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When running a command it may join a set specified with
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.Fl s
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otherwise a new set is created.
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In addition, a mask for the command may be specified using
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.Fl l .
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When used in conjunction with
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.Fl c
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the mask modifies the supplied or created set rather than the private mask
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for the thread.
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.Pp
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The options are as follows:
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.Bl -tag -width ".Fl l Ar cpu-list"
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.It Fl C
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Create a new cpuset and assign the target process to that set.
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.It Fl c
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The requested operation should reference the cpuset available via the
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target specifier.
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.It Fl d Ar domain
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Specifies a NUMA domain id as the target of the operation. This can only
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be used to query the cpus visible in each numberd domain.
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.It Fl g
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Causes
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.Nm
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to print either a list of valid CPUs or, using
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.Fl i ,
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the id of the target.
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.It Fl i
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When used with the
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.Fl g
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option print the id rather than the valid mask of the target.
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.It Fl j Ar jail
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Specifies a jail id or name as the target of the operation.
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.It Fl l Ar cpu-list
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Specifies a list of CPUs to apply to a target.
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Specification may include
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numbers separated by '-' for ranges and commas separating individual numbers.
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A special list of
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.Dq all
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may be specified in which case the list includes all CPUs from the root set.
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.It Fl n Ar policy:domain-list
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Specifies a list of domains and allocation policy to apply to a target. Ranges
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may be specified as in
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.Fl l .
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Valid policies include first-touch (ft), round-robin (rr), prefer and
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interleave (il).
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First-touch allocates on the local domain when memory is available.
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Round-robin alternates between every possible domain page at at time.
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The prefer policy accepts only a single domain in the set.
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The parent of the set is consulted if the preferred domain is unavailable.
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Interleave operates like round-robin with an implementation defined stripe
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width.
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See
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.Xr domainset 9
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for more details on policies.
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.It Fl p Ar pid
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Specifies a pid as the target of the operation.
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.It Fl s Ar setid
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Specifies a set id as the target of the operation.
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.It Fl r
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The requested operation should reference the root set available via the
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target specifier.
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.It Fl t Ar tid
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Specifies a thread id as the target of the operation.
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.It Fl x Ar irq
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Specifies an irq as the target of the operation.
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.El
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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Create a new group with CPUs 0-4 inclusive and run
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.Pa /bin/sh
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on it:
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.Dl cpuset -c -l 0-4 /bin/sh
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.Pp
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Query the mask of CPUs the
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.Aq sh pid
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is allowed to run on:
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.Dl cpuset -g -p <sh pid>
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.Pp
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Restrict
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.Pa /bin/sh
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to run on CPUs 0 and 2 while its group is still allowed to run on
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CPUs 0-4:
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.Dl cpuset -l 0,2 -p <sh pid>
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.Pp
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Modify the cpuset
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.Pa /bin/sh
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belongs to restricting it to CPUs 0 and 2:
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.Dl cpuset -l 0,2 -c -p <sh pid>
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.Pp
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Modify the cpuset all threads are in by default to contain only
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the first 4 CPUs, leaving the rest idle:
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.Dl cpuset -l 0-3 -s 1
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.Pp
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Print the id of the cpuset
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.Pa /bin/sh
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is in:
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.Dl cpuset -g -i -p <sh pid>
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.Pp
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Move the
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.Ar pid
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into the specified cpuset
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.Ar setid
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so it may be managed with other pids in that set:
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.Dl cpuset -s <setid> -p <pid>
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.Pp
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Create a new cpuset that is restricted to CPUs 0 and 2 and move
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.Ar pid
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into the new set:
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.Dl cpuset -C -c -l 0,2 -p <pid>
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.Sh SEE ALSO
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.Xr cpuset 2 ,
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.Xr rctl 8
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Fx 7.1 .
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.Sh AUTHORS
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.An Jeffrey Roberson Aq Mt jeff@FreeBSD.org
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