{"id":2845,"date":"2022-12-20T15:17:28","date_gmt":"2022-12-20T18:17:28","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/zramctl-man8\/"},"modified":"2022-12-20T15:17:28","modified_gmt":"2022-12-20T18:17:28","slug":"zramctl-man8","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/zramctl-man8\/","title":{"rendered":"ZRAMCTL (man8)"},"content":{"rendered":"

ZRAMCTL<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
OPTIONS<\/a>
EXIT STATUS<\/a>
FILES<\/a>
EXAMPLE<\/a>
AUTHORS<\/a>
SEE ALSO<\/a>
AVAILABILITY<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

zramctl \u2212 set up and control zram devices<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

Get info:<\/p>\n

zramctl<\/b> [options]<\/p>\n

Reset zram:<\/p>\n

zramctl \u2212r<\/b> zramdev<\/i>…<\/p>\n

Print name of first unused zram device:<\/p>\n

zramctl \u2212f<\/b><\/p>\n

Set up a zram device:<\/p>\n

zramctl<\/b> [\u2212f<\/b> | zramdev<\/i>] [\u2212s<\/b> size<\/i>] [\u2212t<\/b> number<\/i>] [\u2212a<\/b> algorithm<\/i>]<\/p>\n

DESCRIPTION <\/a> <\/h2>\n

zramctl<\/b> is used to quickly set up zram device parameters, to reset zram devices, and to query the status of used zram devices.<\/p>\n

If no option is given, all non-zero size zram devices are shown.<\/p>\n

Note that zramdev<\/i> node specified on command line has to already exist. The command zramctl<\/b> creates a new \/dev\/zram nodes only when \u2212\u2212find<\/b> option specified. It\u2019s possible (and common) that after system boot \/dev\/zram nodes are not created yet.<\/p>\n

OPTIONS <\/a> <\/h2>\n

\u2212a<\/b>, \u2212\u2212algorithm lzo<\/b>|lz4<\/b>|lz4hc<\/b>|deflate<\/b>|842<\/b><\/p>\n

Set the compression algorithm to be used for compressing data in the zram device.<\/p>\n

\u2212f<\/b>, \u2212\u2212find<\/b><\/p>\n

Find the first unused zram device. If a \u2212\u2212size<\/b> argument is present, then initialize the device.<\/p>\n

\u2212n<\/b>, \u2212\u2212noheadings<\/b><\/p>\n

Do not print a header line in status output.<\/p>\n

\u2212o<\/b>, \u2212\u2212output<\/b> list<\/i><\/p>\n

Define the status output columns to be used. If no output arrangement is specified, then a default set is used. Use \u2212\u2212help<\/b> to get a list of all supported columns.<\/p>\n

\u2212\u2212output\u2212all<\/b><\/p>\n

Output all available columns.<\/p>\n\n\n
<\/td>\n\n

\u2212\u2212raw<\/b><\/p>\n<\/td>\n

<\/td>\n\n

Use the raw format for status output.<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

\u2212r<\/b>, \u2212\u2212reset<\/b><\/p>\n

Reset the options of the specified zram device(s). Zram device settings can be changed only after a reset.<\/p>\n

\u2212s<\/b>, \u2212\u2212size<\/b> size<\/i><\/p>\n

Create a zram device of the specified size<\/i>. Zram devices are aligned to memory pages; when the requested size<\/i> 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<\/i> parameter is bytes.<\/p>\n

The size<\/i> 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.<\/p>\n

\u2212t<\/b>, \u2212\u2212streams<\/b> number<\/i><\/p>\n

Set the maximum number of compression streams that can be used for the device. The default is one stream.<\/p>\n

\u2212V<\/b>, \u2212\u2212version<\/b><\/p>\n

Display version information and exit.<\/p>\n

\u2212h<\/b>, \u2212\u2212help<\/b><\/p>\n

Display help text and exit.<\/p>\n

EXIT STATUS <\/a> <\/h2>\n

zramctl<\/b> returns 0 on success, nonzero on failure.<\/p>\n

FILES <\/a> <\/h2>\n

\/dev\/zram[0..N]<\/i><\/p>\n

zram block devices<\/p>\n

EXAMPLE <\/a> <\/h2>\n

The following commands set up a zram device with a size of one gigabyte and use it as swap device.<\/p>\n

# zramctl –find –size 1024M
\/dev\/zram0
# mkswap \/dev\/zram0
# swapon \/dev\/zram0
…
# swapoff \/dev\/zram0
# zramctl –reset \/dev\/zram0<\/p>\n

AUTHORS <\/a> <\/h2>\n

Timofey Titovets
Karel Zak <\/p>\n

SEE ALSO <\/a> <\/h2>\n

Linux kernel documentation<\/a>.<\/p>\n

AVAILABILITY <\/a> <\/h2>\n

The zramctl command is part of the util-linux package and is available from https:\/\/www.kernel.org\/pub\/linux\/utils\/util-linux\/.<\/p>\n

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zramctl \u2212 set up and control zram devices <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[5,52,4,195],"class_list":["post-2845","post","type-post","status-publish","format-standard","hentry","category-8-administracion-del-sistema","tag-5","tag-administracion","tag-man8","tag-zramctl"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/2845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/comments?post=2845"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/2845\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=2845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=2845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=2845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}