lsmem
LSMEM(1) User Commands LSMEM(1)
NAME
lsmem - list the ranges of available memory with their online status
SYNOPSIS
lsmem [options]
DESCRIPTION
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 out-
puts 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
-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
format.
-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. The default list of columns may be
extended if list is specified in the format +list (e.g. lsmem -o
+NODE).
-P, --pairs
Produce output in the form of key="value" pairs. All poten-
tially unsafe characters are hex-escaped (\x<code>).
-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.
--summary[=when]
This option controls summary lines output. The optional argu-
ment 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
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
chmem(8)
AVAILABILITY
The lsmem command is part of the util-linux package and is available
from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-
linux/>.
util-linux October 2016 LSMEM(1)
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