「zramctl」-

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zramctl – set up and control zram devices

命令语法格式

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]

命令描述

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.

命令支持的选项及含义

-a, –algorithm lzo|lz4|lz4hc|deflate|842
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 speci‐

fied, 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 suf‐

fixes 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.

相关文件

/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

相关手册

参考文献

  • man 8 zramctl, Version zramctl from util-linux 2.32

更新日志

  • 07/11/2018 创建文章