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−listConfigure 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−listDisable the specified CPUs. Disabling a CPU means that the kernel sets it offline.
−e,
−−enable cpu−listEnable 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−listDeconfigure 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 modeSet 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,
−−rescanTrigger 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,
−−versionDisplay version information and exit.
−h,
−−helpDisplay help text and exit.
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive
| COPYRIGHT |
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Copyright IBM Corp. 2011 |