NAME

       lscpu - display information about the CPU architecture

SYNOPSIS

       lscpu [options]

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.

       The default output formatting on terminal is subject to change and maybe optimized for
       better readability. The output for non-terminals (e.g., pipes) is never affected by this
       optimization and it is always in "Field: data\n" format. Use for example "lscpu | less" to
       see the default output without optimizations.

       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.

       The cache sizes are reported as summary from all CPUs. The versions before v2.34 reported
       per-core sizes, but this output was confusing due to complicated CPUs topology and the way
       how caches are shared between CPUs. For more details about caches see --cache. Since
       version v2.37 lscpu follows cache IDs as provided by Linux kernel and it does not always
       start from zero.

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, --bytes
           Print the sizes in bytes rather than in a human-readable format.

           By default, the unit, sizes are expressed in, is byte, and unit prefixes are in power
           of 2^10 (1024). Abbreviations of symbols are exhibited truncated in order to reach a
           better readability, by exhibiting alone the first letter of them; examples: "1 KiB"
           and "1 MiB" are respectively exhibited as "1 K" and "1 M", then omitting on purpose
           the mention "iB", which is part of these abbreviations.

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

       -C, --caches[=list]
           Display details about CPU caches. For details about available information see --help
           output.

           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: -C=NAME,ONE-SIZE or
           --caches=NAME,ONE-SIZE.

           The default list of columns may be extended if list is specified in the format +list
           (e.g., lscpu -C=+ALLOC-POLICY).

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

       --hierarchic[=when]
           Use subsections in summary output. For backward compatibility, the default is to use
           subsections only when output on a terminal and flattened output on a non-terminal. The
           optional argument when can be never, always or auto. If the when argument is omitted,
           it defaults to "always".

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

           If the list argument is omitted, the default columns are included in the command
           output. The default output is subject to change.

           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'.

           The default list of columns may be extended if list is specified in the format +list
           (e.g., lscpu -e=+MHZ).

       -J, --json
           Use JSON output format for the default summary or extended output (see --extended).
           For backward compatibility, JSON output follows the default summary behavior for
           non-terminals (e.g., pipes) where subsections are missing. See also --hierarchic.

       -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'.

           The default list of columns may be extended if list is specified in the format +list
           (e.g., lscpu -p=+MHZ).

       -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 "ff"). The default is to print the
           sets in list format (for example 0,1). Note that before version 2.30 the mask has been
           printed with 0x prefix.

       -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.

       --output-all
           Output all available columns. This option must be combined with either --extended,
           --parse or --caches.

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.

AUTHORS

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

SEE ALSO

       chcpu(8)

REPORTING BUGS

       For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.

AVAILABILITY

       The lscpu command is part of the util-linux package which can be downloaded from Linux
       Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.