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.
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.
-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).
-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/>.
util-linux 2.38.1 2022-08-04 LSCPU(1)
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