|
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | AUTHORS | COPYRIGHT | SEE ALSO | AVAILABILITY | COLOPHON |
|
|
|
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 exit status values:
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
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) 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)
|
HTML rendering created 2020-12-21 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|