lscpu — display information about the CPU architecture
lscpu [ −a | −b | −c ] [−x] [ −s directory ] [ −e [=list] | −p [=list] ]
lscpu −h | −V
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.
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.
CPUThe logical CPU number of a CPU as used by the Linux kernel.
COREThe logical core number. A core can contain several CPUs.
SOCKETThe logical socket number. A socket can contain several cores.
BOOKThe logical book number. A book can contain several sockets.
NODEThe logical NUMA node number. A node may contain several books.
CACHEInformation about how caches are shared between CPUs.
ADDRESSThe physical address of a CPU.
ONLINEIndicator that shows whether the Linux instance currently makes use of the CPU.
CONFIGUREDIndicator 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.
POLARIZATIONThis 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.
MMHZMaximum 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.
−a,
−−allInclude 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,
−−onlineLimit the output to online CPUs (default for
−p). This
option may only be specified together with option
−e or
−p.
−c,
−−offlineLimit 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,
−−helpDisplay 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 directoryGather 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,
−−hexUse hexadecimal masks for CPU sets (for example 0x3). The default is to print the sets in list format (for example 0,1).
−V,
−−versionDisplay version information and exit.
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.