サーバーのよく使うコマンドメモ| free

2015年3月25日

コマンド サーバー テクノロジー

Summery

Linuxサーバーのメモリー使用状況の表示

Construction

$ free [option]

Option

-b, --bytes show output in bytes -k, --kilo show output in kilobytes -m, --mega show output in megabytes -g, --giga show output in gigabytes --tera show output in terabytes -h, --human show human-readable output --si use powers of 1000 not 1024 -l, --lohi show detailed low and high memory statistics -o, --old use old format (without -/+buffers/cache line) -t, --total show total for RAM + swap -s N, --seconds N repeat printing every N seconds -c N, --count N repeat printing N times, then exit --help display this help and exit -V, --version output version information and exit

Sample

$ free total used free shared buffers cached Mem: 8185996 7601836 584160 58732 226704 6653808 -/+ buffers/cache: 721324 7464672 Swap: 8262652 126548 8136104

Discription

NAME free - Display amount of free and used memory in the system SYNOPSIS free [options] DESCRIPTION free displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel. The shared memory column represents either the MemShared value (2.4 series kernels) or the Shmem value (2.6 series kernels and later) taken from the /proc/meminfo file. The value is zero if none of the entries is exported by the kernel. OPTIONS -b, --bytes Display the amount of memory in bytes. -k, --kilo Display the amount of memory in kilobytes. This is the default. -m, --mega Display the amount of memory in megabytes. -g, --giga Display the amount of memory in gigabytes. --tera Display the amount of memory in terabytes. -h, --human Show all output fields automatically scaled to shortest three digit unit and display the units of print out. Following units are used. B = bytes K = kilos M = megas G = gigas T = teras If unit is missing, and you have petabyte of RAM or swap, the number is in terabytes and columns might not be aligned with header. -c, --count count Display the result count times. Requires the -s option. -l, --lohi Show detailed low and high memory statistics. -o, --old Display the output in old format, the only difference being this option will disable the display of the "buffer adjusted" line. -s, --seconds seconds Continuously display the result delay seconds apart. You may actually specify any floating point number for delay, usleep(3) is used for microsecond resolution delay times. --si Use power of 1000 not 1024. -t, --total Display a line showing the column totals. --help Print help. -V, --version Display version information. FILES /proc/meminfo memory information SEE ALSO ps(1), slabtop(1), top(1), vmstat(8). AUTHORS Written by Brian Edmonds. REPORTING BUGS Please send bug reports to ⟨procps@freelists.org⟩