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CHCPU(8)			 User Manuals			      CHCPU(8)

NAME
       chcpu - configure CPUs

SYNOPSIS
       chcpu -e|-d|-c|-g cpu-list
       chcpu -p mode
       chcpu -r
       chcpu -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	hyper‐
       visor,  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
       -r, --rescan
	      Trigger a rescan of CPUs. Use this option on systems that do not
	      automatically  detect newly attached CPUs. The Linux kernel then
	      recognizes the new CPUs.

       -c, --configure cpu-list
	      Configure all 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.

       -e, --enable cpu-list
	      Enable all specified CPUs. Enabling a CPU means that the	kernel
	      sets it online. A CPU must be configured, see -c,	 before it can
	      be enabled.

       -p, --dispatch mode
	      Set the CPU dispatching mode (polarization). This option has  an
	      effect only if your hardware architecture and hypervisor support
	      CPU polarization. There are two modes:

	      horizontal  The workload is spread across all available CPUs.

	      vertical	  The workload is concentrated on few CPUs.

       -d, --disable cpu-list
	      Disable all specified CPUs. Disabling a CPU means that the  ker‐
	      nel sets it offline.

       -g, --deconfigure cpu-list
	      Deconfigure  all	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.

       -h, --help
	      Display help information and exit.

       -V, --version
	      Display version information and exit.

AUTHOR
       Heiko Carstens <heiko.carstens@de.ibm.com>

COPYRIGHT
       Copyright IBM Corp. 2011

SEE ALSO
       lscpu(1)

AVAILABILITY
       The chcpu command is part of the util-linux package  and	 is  available
       from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

Linux				  August 2011			      CHCPU(8)

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