lscpu

LSCPU(1)                         User Commands                        LSCPU(1)

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.

       -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.

       -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).

       -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'.

           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.

       -V, --version
           Display version information and exit.

       --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/karelzak/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/>.

util-linux 2.37.2                 2021-06-02                          LSCPU(1)