lscpu(1)
NAME
lscpu - display information about the CPU architecture
SYNOPSIS
lscpu [-a|-b|-c] [-x] [-y] [-s directory] [-e[=list]|-p[=list]] lscpu -h|-V
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.
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.
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
drawers.
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
hypervisor support dynamic CPU resource allocation.
POLARIZATION
This column contains data for Linux instances that run on
virtual hardware with a hypervisor that can switch the CPU
dispatching 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
polarization.
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
depending 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, --online
Limit the output to online CPUs (default for -p). This option
may only be specified together with option -e or -p.
-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, 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: '-e=cpu,node' or '--extended=cpu,node'.
-h, --help
Display help text and exit.
-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'.
-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 0x3). The
default is to print the sets in list format (for example 0,1).
-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.
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 <[email protected]> Karel Zak <[email protected]> Heiko Carstens <[email protected]>
SEE ALSO
chcpu(8)
AVAILABILITY
The lscpu command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
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