LSMEM(1)                        User Commands                       LSMEM(1)

NAME         top

       lsmem - list the ranges of available memory with their online status

SYNOPSIS         top

       lsmem [options]

DESCRIPTION         top

       The lsmem command lists the ranges of available memory with their
       online status. The listed memory blocks correspond to the memory
       block representation in sysfs. The command also shows the memory
       block size and the amount of memory in online and offline state.

       The default output compatible with original implementaion from
       s390-tools, but it's strongly recommended to avoid using default
       outputs in your scripts.  Always explicitly define expected columns
       by using the --output option together with a columns list in
       environments where a stable output is required.

       Not all columns are supported on all systems.  If an unsupported
       column is specified, lsmem prints the column but does not provide any
       data for it.

       Use the --help option to see the columns description.

OPTIONS         top

       -a, --all
              List each individual memory block, instead of combining memory
              blocks with similar attributes.

       -b, --bytes
              Print the SIZE column in bytes rather than in a human-readable

       -h, --help
              Display help text and exit.

       -J, --json
              Use JSON output format.

       -n, --noheadings
              Do not print a header line.

       -o, --output list
              Specify which output columns to print.  Use --help to get a
              list of all supported columns.

       -P, --pairs
              Produce output in the form of key="value" pairs.  All
              potentially unsafe characters are hex-escaped (\x<code>).  The
              default list of columns may be extended if list is specified
              in the format +list (e.g. lsmem -o +NODE).

       -r, --raw
              Produce output in raw format.  All potentially unsafe
              characters are hex-escaped (\x<code>).

       -s, --sysroot directory
              Gather memory data for a Linux instance other than the
              instance from which the lsmem command is issued.  The
              specified directory is the system root of the Linux instance
              to be inspected.

       -V, --version
              Display version information and exit.

              This option controls summary lines output.  The optional
              argument when can be never, always or only.  If the when
              argument is omitted, it defaults to "only". The summary output
              is suppresed for --raw, --pairs and --json.

AUTHOR         top

       lsmem was originally written by Gerald Schaefer for s390-tools in
       Perl. The C version for util-linux was written by Clemens von Mann,
       Heiko Carstens and Karel Zak.

SEE ALSO         top


AVAILABILITY         top

       The lsmem command is part of the util-linux package and is available
       from Linux Kernel Archive 

COLOPHON         top

       This page is part of the util-linux (a random collection of Linux
       utilities) project.  Information about the project can be found at 
       ⟨⟩.  If you have a
       bug report for this manual page, send it to  This page was obtained from the
       project's upstream Git repository 
       ⟨git://⟩ on
       2017-09-15.  If you discover any rendering problems in this HTML ver‐
       sion of the page, or you believe there is a better or more up-to-date
       source for the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original man‐
       ual page), send a mail to

util-linux                      October 2016                        LSMEM(1)

Pages that refer to this page: chmem(8)