Section (8) chcpu
Name
chcpu — configure CPUs
Synopsis
chcpu
−c
| −d
| −e
| −g
cpu−list
chcpu
−p
mode
chcpu
−r
| −h
| −V
DESCRIPTION
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.
OPTIONS
−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.
AVAILABILITY
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive
COPYRIGHT |
---|
Copyright IBM Corp. 2011 |