1LSMEM(1) User Commands LSMEM(1)
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6 lsmem - list the ranges of available memory with their online status
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9 lsmem [options]
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12 The lsmem command lists the ranges of available memory with their
13 online status. The listed memory blocks correspond to the memory block
14 representation in sysfs. The command also shows the memory block size
15 and the amount of memory in online and offline state.
16 The default output is compatible with original implementation from
18 s390-tools, but it’s strongly recommended to avoid using default
19 outputs in your scripts. Always explicitly define expected columns by
20 using the --output option together with a columns list in environments
21 where a stable output is required.
22 The lsmem command lists a new memory range always when the current
24 memory block distinguish from the previous block by some output column.
25 This default behavior is possible to override by the --split option
26 (e.g., lsmem --split=ZONES). The special word "none" may be used to
27 ignore all differences between memory blocks and to create as large as
28 possible continuous ranges. The opposite semantic is --all to list
29 individual memory blocks.
30 Note that some output columns may provide inaccurate information if a
32 split policy forces lsmem to ignore differences in some attributes. For
33 example if you merge removable and non-removable memory blocks to the
34 one range than all the range will be marked as non-removable on lsmem
35 output.
36 Not all columns are supported on all systems. If an unsupported column
38 is specified, lsmem prints the column but does not provide any data for
39 it.
40 Use the --help option to see the columns description.
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44 -a, --all
45 List each individual memory block, instead of combining memory
46 blocks with similar attributes.
47 -b, --bytes
49 Print the sizes in bytes rather than in a human-readable format.
50 By default, the unit, sizes are expressed in, is byte, and unit
52 prefixes are in power of 2^10 (1024). Abbreviations of symbols are
53 exhibited truncated in order to reach a better readability, by
54 exhibiting alone the first letter of them; examples: "1 KiB" and "1
55 MiB" are respectively exhibited as "1 K" and "1 M", then omitting
56 on purpose the mention "iB", which is part of these abbreviations.
57 -J, --json
59 Use JSON output format.
60 -n, --noheadings
62 Do not print a header line.
63 -o, --output list
65 Specify which output columns to print. Use --help to get a list of
66 all supported columns. The default list of columns may be extended
67 if list is specified in the format +list (e.g., lsmem -o +NODE).
68 --output-all
70 Output all available columns.
71 -P, --pairs
73 Produce output in the form of key="value" pairs. All potentially
74 unsafe value characters are hex-escaped (\x<code>).
75 -r, --raw
77 Produce output in raw format. All potentially unsafe characters are
78 hex-escaped (\x<code>).
79 -S, --split list
81 Specify which columns (attributes) use to split memory blocks to
82 ranges. The supported columns are STATE, REMOVABLE, NODE and ZONES,
83 or "none". The other columns are silently ignored. For more details
84 see DESCRIPTION above.
85 -s, --sysroot directory
87 Gather memory data for a Linux instance other than the instance
88 from which the lsmem command is issued. The specified directory is
89 the system root of the Linux instance to be inspected.
90 -h, --help
92 Display help text and exit.
93 -V, --version
95 Print version and exit.
96 --summary[=when]
98 This option controls summary lines output. The optional argument
99 when can be never, always or only. If the when argument is omitted,
100 it defaults to "only". The summary output is suppressed for --raw,
101 --pairs and --json.
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104 lsmem was originally written by Gerald Schaefer for s390-tools in Perl.
105 The C version for util-linux was written by Clemens von Mann, Heiko
106 Carstens and Karel Zak.
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109 chmem(8)
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112 For bug reports, use the issue tracker at
113 https://github.com/util-linux/util-linux/issues.
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116 The lsmem command is part of the util-linux package which can be
117 downloaded from Linux Kernel Archive
118 <https://www.kernel.org/pub/linux/utils/util-linux/>.
119util-linux 2.38.1 2022-05-11 LSMEM(1)