ZRAMCTL
Section: System Administration (8)Updated: July 2014
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NAME
zramctl - set up and control zram devicesSYNOPSIS
Get info:zramctl [options]
Reset zram:
zramctl -r zramdev...
Print name of first unused zram device:
zramctl -f
Set up a zram device:
zramctl [-f | zramdev] [-s size] [-t number] [-a algorithm]
DESCRIPTION
zramctl is used to quickly set up zram device parameters, to reset zram devices, and to query the status of used zram devices.If no option is given, all non-zero size zram devices are shown.
OPTIONS
- -a, --algorithm lzo|lz4
- Set the compression algorithm to be used for compressing data in the zram device.
- -f, --find
- Find the first unused zram device. If a --size argument is present, then initialize the device.
- -n, --noheadings
- Do not print a header line in status output.
- -o, --output list
- Define the status output columns to be used. If no output arrangement is specified, then a default set is used. Use --help to get a list of all supported columns.
- --raw
- Use the raw format for status output.
- -r, --reset
- Reset the options of the specified zram device(s). Zram device settings can be changed only after a reset.
- -s, --size size
- Create a zram device of the specified size. Zram devices are aligned to memory pages; when the requested size is not a multiple of the page size, it will be rounded up to the next multiple. When not otherwise specified, the unit of the size parameter is bytes.
- The size argument may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or the suffixes KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB.
- -t, --streams number
- Set the maximum number of compression streams that can be used for the device. The default is one stream.
- -V, --version
- Display version information and exit.
- -h, --help
-
Display help text and exit.
RETURN VALUE
zramctl returns 0 on success, nonzero on failure.FILES
- /dev/zram[0..N]
-
zram block devices
EXAMPLE
The following commands set up a zram device with a size of one gigabyte and use it as swap device.- # zramctl --find --size 1024M /dev/zram0 # mkswap /dev/zram0 # swapon /dev/zram0 ... # swapoff /dev/zram0 # zramctl --reset /dev/zram0
SEE ALSO
Linux kernel documentationAUTHORS
Timofey Titovets <nefelim4ag@gmail.com> Karel Zak <kzak@redhat.com>
AVAILABILITY
The zramctl command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
Index
This document was created by man2html, using the manual pages.
Time: 04:45:58 GMT, September 16, 2022
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