LSCPU(1)							   User Commands							  LSCPU(1)

NAME

       lscpu - display information about the CPU architecture

SYNOPSIS

       lscpu [-a|-b|-c|-J] [-x] [-y] [-s directory] [-e[=list]|-p[=list]]
       lscpu -h|-V

DESCRIPTION

       lscpu  gathers  CPU  architecture information from sysfs, /proc/cpuinfo and any applicable architecture-specific libraries (e.g. librtas on
       Powerpc).  The command output can be optimized for parsing or for easy readability by humans.  The information includes, for  example,  the
       number  of  CPUs,  threads, cores, sockets, and Non-Uniform Memory Access (NUMA) nodes.	There is also information about the CPU caches and
       cache sharing, family, model, bogoMIPS, byte order, and stepping.

       In virtualized environments, the CPU architecture information displayed reflects the configuration of the guest operating system  which	is
       typically  different  from  the physical (host) system.	On architectures that support retrieving physical topology information, lscpu also
       displays the number of physical sockets, chips, cores in the host system.

       Options that result in an output table have a list argument.  Use this argument to customize the command output.  Specify a comma-separated
       list  of column labels to limit the output table to only the specified columns, arranged in the specified order.  See COLUMNS for a list of
       valid column labels.  The column labels are not case sensitive.

       Not all columns are supported on all architectures.  If an unsupported column is specified, lscpu prints the column but	does  not  provide
       any data for it.

   COLUMNS
       Note  that  topology elements (core, socket, etc.) use a sequential unique ID starting from zero, but CPU logical numbers follow the kernel
       where there is no guarantee of sequential numbering.

       CPU    The logical CPU number of a CPU as used by the Linux kernel.

       CORE   The logical core number.	A core can contain several CPUs.

       SOCKET The logical socket number.  A socket can contain several cores.

       BOOK   The logical book number.	A book can contain several sockets.

       DRAWER The logical drawer number.  A drawer can contain several books.

       NODE   The logical NUMA node number.  A node can contain several drawers.

       CACHE  Information about how caches are shared between CPUs.

       ADDRESS
	      The physical address of a CPU.

       ONLINE Indicator that shows whether the Linux instance currently makes use of the CPU.

       CONFIGURED
	      Indicator that shows if the hypervisor has allocated the CPU to the virtual hardware on which the Linux instance	runs.	CPUs  that
	      are  configured can be set online by the Linux instance.	This column contains data only if your hardware system and hypervisor sup-
	      port dynamic CPU resource allocation.

       POLARIZATION
	      This column contains data for Linux instances that run on virtual hardware with a hypervisor that can  switch  the  CPU  dispatching
	      mode (polarization).  The polarization can be:

	      horizontal  The workload is spread across all available CPUs.

	      vertical	  The workload is concentrated on few CPUs.

	      For  vertical polarization, the column also shows the degree of concentration, high, medium, or low.  This column contains data only
	      if your hardware system and hypervisor support CPU polarization.

       MAXMHZ Maximum megahertz value for the CPU. Useful when lscpu is used as hardware inventory information gathering tool.	 Notice  that  the
	      megahertz value is dynamic, and driven by CPU governor depending on current resource need.

       MINMHZ Minimum megahertz value for the CPU.

OPTIONS

       -a, --all
	      Include lines for online and offline CPUs in the output (default for -e).  This option may only be specified together with option -e
	      or -p.

       -b, --online
	      Limit the output to online CPUs (default for -p).  This option may only be specified together with option -e or -p.

       -c, --offline
	      Limit the output to offline CPUs.  This option may only be specified together with option -e or -p.

       -e, --extended[=list]
	      Display the CPU information in human-readable format.

	      If the list argument is omitted, all columns for which data is available are included in the command output.

	      When specifying the list argument, the string of option, equal sign (=), and list must not contain any blanks or	other  whitespace.
	      Examples: '-e=cpu,node' or '--extended=cpu,node'.

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

       -J, --json
	      Use JSON output format for the default summary or extended output (see --extended).

       -p, --parse[=list]
	      Optimize the command output for easy parsing.

	      If  the  list  argument is omitted, the command output is compatible with earlier versions of lscpu.  In this compatible format, two
	      commas are used to separate CPU cache columns.  If no CPU caches are identified the cache column is omitted.
	      If the list argument is used, cache columns are separated with a colon (:).

	      When specifying the list argument, the string of option, equal sign (=), and list must not contain any blanks or	other  whitespace.
	      Examples: '-p=cpu,node' or '--parse=cpu,node'.

       -s, --sysroot directory
	      Gather CPU data for a Linux instance other than the instance from which the lscpu command is issued.  The specified directory is the
	      system root of the Linux instance to be inspected.

       -x, --hex
	      Use hexadecimal masks for CPU sets (for example 0x3).  The default is to print the sets in list format (for example 0,1).

       -y, --physical
	      Display physical IDs for all columns with topology elements (core, socket, etc.).  Other than logical IDs,  which  are  assigned	by
	      lscpu,  physical	IDs are platform-specific values that are provided by the kernel. Physical IDs are not necessarily unique and they
	      might not be arranged sequentially.  If the kernel could not retrieve a physical ID for an element lscpu prints the dash (-) charac-
	      ter.

	      The CPU logical numbers are not affected by this option.

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

BUGS

       The basic overview of CPU family, model, etc. is always based on the first CPU only.

       Sometimes in Xen Dom0 the kernel reports wrong data.

       On virtual hardware the number of cores per socket, etc. can be wrong.

AUTHOR

       Cai Qian <qcai@redhat.com>
       Karel Zak <kzak@redhat.com>
       Heiko Carstens <heiko.carstens@de.ibm.com>

SEE ALSO

       chcpu(8)

AVAILABILITY

       The lscpu command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux							   November 2015							  LSCPU(1)