LSCPU(1)							   User Commands							  LSCPU(1)

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 read-
       ability 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
       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 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.

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 information 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/.

util-linux							   January 2013 							  LSCPU(1)