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 num-
       ber  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 typi-
       cally 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 draw-
	      ers.

       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 support dynamic CPU resource allocation.

       POLARIZATION
	      This  column  contains data for Linux instances that run on vir-
	      tual hardware with a hypervisor that can	switch	the  CPU  dis-
	      patching 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 polar-
	      ization.

       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 spec-
	      ified 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 white-
	      space.  Examples: '-e=cpu,node' or '--extended=cpu,node'.

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

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

	      If the list argument is omitted, the command output is  compati-
	      ble  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 white-
	      space.  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  necessar-
	      ily  unique and they might not be arranged sequentially.	If the
	      kernel could not retrieve a physical ID  for  an	element	 lscpu
	      prints the dash (-) character.

	      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)