FREE - Online Linux Manual PageSection : 1
Updated : 2018-05-31
Source : procps-ng
Note : User Commands
NAMEfree − Display amount of free and used memory in the system
SYNOPSISfree [options]
DESCRIPTIONfree displays the total amount of free and used physical and swap memory in the system, as well as the buffers and caches used by the kernel. The information is gathered by parsing /proc/meminfo. The displayed columns are: total  Total installed memory (MemTotal and SwapTotal in /proc/meminfo) used  Used memory (calculated as total - free - buffers - cache) free  Unused memory (MemFree and SwapFree in /proc/meminfo) shared  Memory used (mostly) by tmpfs (Shmem in /proc/meminfo) buffers  Memory used by kernel buffers (Buffers in /proc/meminfo) cache  Memory used by the page cache and slabs (Cached and SReclaimable in /proc/meminfo) buff/cache  Sum of buffers and cache available  Estimation of how much memory is available for starting new applications, without swapping. Unlike the data provided by the cache or free fields, this field takes into account page cache and also that not all reclaimable memory slabs will be reclaimed due to items being in use (MemAvailable in /proc/meminfo, available on kernels 3.14, emulated on kernels 2.6.27+, otherwise the same as free)
OPTIONS−b, −−bytes  Display the amount of memory in bytes. −k, −−kibi  Display the amount of memory in kibibytes. This is the default. −m, −−mebi  Display the amount of memory in mebibytes. −g, −−gibi  Display the amount of memory in gibibytes. −−tebi  Display the amount of memory in tebibytes. −−pebi  Display the amount of memory in pebibytes. −−kilo  Display the amount of memory in kilobytes. Implies --si. −−mega  Display the amount of memory in megabytes. Implies --si. −−giga  Display the amount of memory in gigabytes. Implies --si. −−tera  Display the amount of memory in terabytes. Implies --si. −−peta  Display the amount of memory in petabytes. Implies --si. −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 Ki = kibibyte Mi = mebibyte Gi = gibibyte Ti = tebibyte Pi = pebibyteIf unit is missing, and you have exbibyte of RAM or swap, the number is in tebibytes and columns might not be aligned with header. −w, −−wide  Switch to the wide mode. The wide mode produces lines longer than 80 characters. In this mode buffers and cache are reported in two separate columns. −c, −−count count  Display the result count times. Requires the −s option. −l, −−lohi  Show detailed low and high memory statistics. −s, −−seconds delay  Continuously display the result delay seconds apart. You may actually specify any floating point number for delay using either . or , for decimal point. usleep(3) is used for microsecond resolution delay times. −−si  Use kilo, mega, giga etc (power of 1000) instead of kibi, mebi, gibi (power of 1024). −t, −−total  Display a line showing the column totals. −−help  Print help. −V, −−version  Display version information.
FILES/proc/meminfo  memory information
BUGSThe value for the shared column is not available from kernels before 2.6.32 and is displayed as zero. Please send bug reports to  procps@freelists.org
SEE ALSOps(1), slabtop(1), top(1), vmstat(8). 0
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