{"id":3788,"date":"2022-12-20T17:20:04","date_gmt":"2022-12-20T20:20:04","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/chcpu-man8\/"},"modified":"2022-12-20T17:20:04","modified_gmt":"2022-12-20T20:20:04","slug":"chcpu-man8","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/chcpu-man8\/","title":{"rendered":"CHCPU (man8)"},"content":{"rendered":"

CHCPU<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
OPTIONS<\/a>
EXIT STATUS<\/a>
AUTHORS<\/a>
COPYRIGHT<\/a>
SEE ALSO<\/a>
AVAILABILITY<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

chcpu \u2212 configure CPUs<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

chcpu \u2212c<\/b>|\u2212d<\/b>|\u2212e<\/b>|\u2212g<\/b> cpu-list<\/i>
chcpu \u2212p<\/b> mode<\/i>
chcpu \u2212r<\/b>|\u2212h<\/b>|\u2212V<\/b><\/p>\n

DESCRIPTION <\/a> <\/h2>\n

chcpu<\/b> can modify the state of CPUs. It can enable or disable CPUs, scan for new CPUs, change the CPU dispatching mode<\/i> of the underlying hypervisor, and request CPUs from the hypervisor (configure) or return CPUs to the hypervisor (deconfigure).<\/p>\n

Some options have a cpu-list<\/i> 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<\/b> makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and 11.<\/p>\n

OPTIONS <\/a> <\/h2>\n

\u2212c<\/b>, \u2212\u2212configure<\/b> cpu-list<\/i><\/p>\n

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.<\/p>\n

\u2212d<\/b>, \u2212\u2212disable<\/b> cpu-list<\/i><\/p>\n

Disable the specified CPUs. Disabling a CPU means that the kernel sets it offline.<\/p>\n

\u2212e<\/b>, \u2212\u2212enable<\/b> cpu-list<\/i><\/p>\n

Enable the specified CPUs. Enabling a CPU means that the kernel sets it online. A CPU must be configured, see \u2212c<\/b>, before it can be enabled.<\/p>\n

\u2212g<\/b>, \u2212\u2212deconfigure<\/b> cpu-list<\/i><\/p>\n

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 \u2212d<\/b>, before it can be deconfigured.<\/p>\n

\u2212p<\/b>, \u2212\u2212dispatch<\/b> mode<\/i><\/p>\n

Set the CPU dispatching mode<\/i> (polarization). This option has an effect only if your hardware architecture and hypervisor support CPU polarization. Available modes<\/i> are:<\/p>\n\n\n\n
<\/td>\n\n

horizontal<\/b><\/p>\n<\/td>\n

<\/td>\n\n

The workload is spread across all available CPUs.<\/p>\n<\/td>\n<\/tr>\n

<\/td>\n\n

vertical<\/b><\/p>\n<\/td>\n

<\/td>\n\n

The workload is concentrated on few CPUs.<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

\u2212r<\/b>, \u2212\u2212rescan<\/b><\/p>\n

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.<\/p>\n

\u2212V<\/b>, \u2212\u2212version<\/b><\/p>\n

Display version information and exit.<\/p>\n

\u2212h<\/b>, \u2212\u2212help<\/b><\/p>\n

Display help text and exit.<\/p>\n

EXIT STATUS <\/a> <\/h2>\n

chcpu<\/b> has the following exit status values:<\/p>\n\n\n\n\n
<\/td>\n\n

0<\/b><\/p>\n<\/td>\n

<\/td>\n\n

success<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

1<\/b><\/p>\n<\/td>\n

<\/td>\n\n

failure<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n
<\/td>\n\n

64<\/b><\/p>\n<\/td>\n

<\/td>\n\n

partial success<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

AUTHORS <\/a> <\/h2>\n

Heiko Carstens<\/a><\/p>\n

COPYRIGHT <\/a> <\/h2>\n

Copyright IBM Corp. 2011<\/p>\n

SEE ALSO <\/a> <\/h2>\n

lscpu<\/b>(1)<\/p>\n

AVAILABILITY <\/a> <\/h2>\n

The chcpu command is part of the util-linux package and is available from Linux Kernel Archive<\/a>.<\/p>\n

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