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