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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | RETURN CODES | AUTHOR | COPYRIGHT | SEE ALSO | AVAILABILITY | COLOPHON |
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CHCPU(8) System Administration CHCPU(8)
chcpu - configure CPUs
chcpu -c|-d|-e|-g cpu-list
chcpu -p mode
chcpu -r|-h|-V
chcpu can modify the state of CPUs. It can enable or disable CPUs,
scan for new CPUs, change the CPU dispatching mode of the underlying
hypervisor, and request CPUs from the hypervisor (configure) or
return CPUs to the hypervisor (deconfigure).
Some options have a cpu-list argument. Use this argument to specify
a comma-separated list of CPUs. The list can contain individual CPU
addresses or ranges of addresses. For example, 0,5,7,9-11 makes the
command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and
11.
-c, --configure cpu-list
Configure the specified CPUs. Configuring a CPU means that
the hypervisor takes a CPU from the CPU pool and assigns it to
the virtual hardware on which your kernel runs.
-d, --disable cpu-list
Disable the specified CPUs. Disabling a CPU means that the
kernel sets it offline.
-e, --enable cpu-list
Enable the specified CPUs. Enabling a CPU means that the
kernel sets it online. A CPU must be configured, see -c,
before it can be enabled.
-g, --deconfigure cpu-list
Deconfigure the specified CPUs. Deconfiguring a CPU means
that the hypervisor removes the CPU from the virtual hardware
on which the Linux instance runs and returns it to the CPU
pool. A CPU must be offline, see -d, before it can be
deconfigured.
-p, --dispatch mode
Set the CPU dispatching mode (polarization). This option has
an effect only if your hardware architecture and hypervisor
support CPU polarization. Available modes are:
horizontal The workload is spread across all available
CPUs.
vertical The workload is concentrated on few CPUs.
-r, --rescan
Trigger a rescan of CPUs. After a rescan, the Linux kernel
recognizes the new CPUs. Use this option on systems that do
not automatically detect newly attached CPUs.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
chcpu has the following return codes:
0 success
1 failure
64 partial success
Heiko Carstens ⟨heiko.carstens@de.ibm.com⟩
Copyright IBM Corp. 2011
lscpu(1)
The chcpu command is part of the util-linux package and is available
from Linux Kernel Archive
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2018-02-02. (At that time, the date of the most recent commit that
was found in the repository was 2018-02-01.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
util-linux July 2014 CHCPU(8)
Pages that refer to this page: lscpu(1)
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