NAME

       lscpu - display information about the CPU architecture

SYNOPSIS

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

DESCRIPTION

       lscpu  gathers  CPU  architecture  information  from  sysfs and /proc/cpuinfo.  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.

       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 sequential unique ID starting  from  zero,  but  CPU
       logical numbers follow kernel where is no guarantee of the 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.

       NODE   The logical NUMA node number.  A node may contain several books.

       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.

              MMHZ   Maximum  megaherz  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.

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.

       -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).

       -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
       ftp://ftp.kernel.org/pub/linux/utils/util-linux/.