linux技术开源社区|lscpu讲解

时间 : 14-12-11 栏目 : linux运维 作者 : 老薛 评论 : 0 点击 : 1,015 次

NAME
lscpu - display information about the CPU architecture

SYNOPSIS
lscpu [-a|-b|-c] [-x] [-s directory] [-e [=list]|-p [=list]]
lscpu -h|-V

DESCRIPTION
lscpu  gathers  CPU  architecture  information from sysfs and /proc/cpuinfo. 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.

Options that result in an output table have a list argument. Use this argument to customize  the  com-
mand  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
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.

NODE   The logical NUMA node number. A node may contain several books.

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 polar-
ization.

OPTIONS
-a, --all
Include lines for online and offline CPUs in the output (default for -e). This option may  only
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 con-
tain any blanks or other white space.  Examples: ’-e=cpu,node’ or ’--extended=cpu,node’.

-h, --help
Display help information 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 con-
tain 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 0x3).  The default is to print the sets in list
format (for example 0,1).

-V, --version
Display version information and exit.
BUGS
The basic overview about 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   ftp://ftp.ker-
nel.org/pub/linux/utils/util-linux/.

util-linux                       February 2011                        LSCPU(1)

 

更多命令详解请参考 linux精解

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