Linux Command - lscpu

The Linux lscpu command is used to display information about the CPU or CPUs on a system.

“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.”

lscpu                      # dump a bunch of CPU info
lscpu -e                   # table, per CPU, human readable
lscpu -e=core,MHZ,MAXMHZ   # specify columns
lscpu -e --output-all      # all columns

lscpu -p                   # table, per CPU, easy parse
lscpu -p=MAXMHZ,MINMHZ     # specify columns
lscpu -p=+MAXMHZ,MINMHZ    # use "+" to extend ( append cols )


lscpu -C                   # cache details, as table
lscpu -C=name,level        # cache details, as table, specify columns
lscpu -C --output-all      # all columns

lscpu -J                   # json output

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. all details or specify a list
-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. - table output, human readable, can specify a list of fields
-h, –help	Display help text and exit.
-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.
-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 - platform specific, not logical, might not be unique
-V, –version	Display version information and exit.
–output-all	Output all available columns. This option must be combined with either –extended, –parse or –caches.

Available output columns for -e or -p:

BOGOMIPS	crude measurement of CPU speed
CPU	logical CPU number
CORE	logical core number
SOCKET	logical socket number
CLUSTER	logical cluster number
NODE	logical NUMA node number
BOOK	logical book number
DRAWER	logical drawer number
CACHE	shows how caches are shared between CPUs
POLARIZATION	CPU dispatching mode on virtual hardware
ADDRESS	physical address of a CPU
CONFIGURED	shows if the hypervisor has allocated the CPU
ONLINE	shows if Linux currently makes use of the CPU
MHZ	shows the currently MHz of the CPU
MAXMHZ	shows the maximum MHz of the CPU
MINMHZ	shows the minimum MHz of the CPU

Available output columns for -C:

ALL-SIZE	size of all system caches
LEVEL	cache level
NAME	cache name
ONE-SIZE	size of one cache
TYPE	cache type
WAYS	ways of associativity
ALLOC-POLICY	allocation policy
WRITE-POLICY	write policy
PHY-LINE	number of physical cache line per cache t
SETS	number of sets in the cache; set lines has the same cache index
COHERENCY-SIZE	minimum amount of data in bytes transferred from memory to cache