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Full Discussion: MemFree from /proc/meminfo
Top Forums Shell Programming and Scripting MemFree from /proc/meminfo Post 302981921 by michaelrozar17 on Wednesday 21st of September 2016 09:42:28 AM
Old 09-21-2016
MemFree from /proc/meminfo

From the following /proc/meminfo output only ~2GB is free out of total 250GB, but Cached is 194630300 kB. My customer is concerned over the very little memory showing as free. Kindly shed some light if the free memory available in this situation is some thing we need to worry or can we take it as expected behavior of Linux kernel - as most of them are cached.
Linux 2.6.39-400.277.1.el6uek.x86_64
Code:
MemTotal:       264082720 kB
MemFree:         2114036 kB
Buffers:          417188 kB
Cached:         194630300 kB
SwapCached:          172 kB
Active:         12577096 kB
Inactive:       189334136 kB
Active(anon):    6788124 kB
Inactive(anon):   221452 kB
Active(file):    5788972 kB
Inactive(file): 189112684 kB
Unevictable:      494788 kB
Mlocked:          494836 kB
SwapTotal:      25165820 kB
SwapFree:       25160384 kB
Dirty:              2008 kB
Writeback:           108 kB
AnonPages:       7402208 kB
Mapped:           260780 kB
Shmem:              1012 kB
Slab:            1532520 kB
SReclaimable:    1201976 kB
SUnreclaim:       330544 kB
KernelStack:       19200 kB
PageTables:       385236 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    130992780 kB
Committed_AS:   12763688 kB
VmallocTotal:   34359738367 kB
VmallocUsed:     1178180 kB
VmallocChunk:   34224213544 kB
HardwareCorrupted:     0 kB
HugePages_Total:   25600
HugePages_Free:    14820
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        8192 kB
DirectMap2M:     2023424 kB
DirectMap1G:    266338304 kB

 

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FREE(1)                                                            User Commands                                                           FREE(1)

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 and caches used by the ker- nel. 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 K = kibibyte M = mebibyte G = gibibyte T = tebibyte P = pebibyte If 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 BUGS
The 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 ALSO
ps(1), slabtop(1), top(1), vmstat(8). procps-ng 2016-06-03 FREE(1)
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