Section (8) chcpu
chcpu — configure CPUs
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.
0,5,7,9-11 makes the command
applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and
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.
Disable the specified CPUs. Disabling a CPU means that the kernel sets it offline.
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.
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.
Set the CPU dispatching
mode(polarization). This option has an effect only if your hardware architecture and hypervisor support CPU polarization. Available modes are:
The workload is spread across all available CPUs.
The workload is concentrated on few CPUs.
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.
Display version information and exit.
Display help text and exit.
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive
Copyright IBM Corp. 2011