lscpu - display information about the CPU architecture

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

       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 2.40.2                                  2025-06-05                                           LSCPU(1)

       The basic overview of CPU models is based on heuristics, taking into account differences such as CPU
       model names and implementer IDs. In some (unusual) cases, CPUs may differentiate in flags or BogoMIPS,
       but these differences are ignored in the lscpu overview.

       Sometimes in Xen Dom0 the kernel reports wrong data.

       On virtual hardware the number of cores per socket, etc. can be wrong.

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.

       lscpu - display information about the CPU architecture

-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, --sysrootdirectory
           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.

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

chcpu(8)

lscpu [options]