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  support  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
              (-) 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)