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 num-
ber 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.
In virtualized environments, the CPU architecture information displayed
reflects the configuration of the guest operating system which is typi-
cally 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 default output formatting on terminal maybe optimized for better
readability. The output for non-terminals (e.g., pipes) is never af-
fected by this optimization and it is always in "Field: data\n" format.
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.
COLUMNS
Note that topology elements (core, socket, etc.) use a sequential
unique ID starting from zero, but CPU logical numbers follow the kernel
where there is no guarantee of sequential numbering.
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.
DRAWER The logical drawer number. A drawer can contain several books.
NODE The logical NUMA node number. A node can contain several draw-
ers.
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 hy-
pervisor support dynamic CPU resource allocation.
POLARIZATION
This column contains data for Linux instances that run on vir-
tual hardware with a hypervisor that can switch the CPU dis-
patching 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 polar-
ization.
MAXMHZ Maximum megahertz value for the CPU. Useful when lscpu is used
as hardware inventory information gathering tool. Notice that
the megahertz value is dynamic, and driven by CPU governor de-
pending on current resource need.
MINMHZ Minimum megahertz value for the CPU.
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 white-
space. Examples: '-C=NAME,ONE-SIZE' or '--caches=NAME,ONE-
SIZE'.
-c, --offline
Limit the output to offline CPUs. This option may only be spec-
ified 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 white-
space. Examples: '-e=cpu,node' or '--extended=cpu,node'.
-h, --help
Display help text and exit.
-J, --json
Use JSON output format for the default summary or extended out-
put (see --extended).
-p, --parse[=list]
Optimize the command output for easy parsing.
If the list argument is omitted, the command output is compati-
ble 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 white-
space. 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 "ff"). The de-
fault 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 as-
signed 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 ker-
nel 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.
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 https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux March 2019 LSCPU(1)