The memory usage reported in cgroup differs from the free command
8,421
memory.usage_in_bytes
and memory.max_usage_in_bytes
report RSS+CACHE, so in terms of your free
output:
memory.usage_in_bytes ~= free.used + free.(buff/cache) - (buff)
You may also be interested in /sys/fs/cgroup/memory/memory.stat
, though I still couldn't find/compute the free.used
value from the /sys/fs/cgroup/memory/memory.stat
output.
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Author by
offbynull
Updated on September 18, 2022Comments
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offbynull almost 2 years
Why would the free command be reporting a much different mem usage number vs cgroup?
$ free -b total used free shared buff/cache available Mem: 2096914432 520863744 1112170496 35389440 463880192 1356828672 Swap: 2145382400 0 2145382400 $ cat /sys/fs/cgroup/memory/memory.usage_in_bytes 857239552
The documentation for cgroups says that memory.usage_in_bytes is a "fuzz value". I'm guessing that just means it reports an estimate that's close to the actual value. Even if it's an estimate, I don't think it should be this far off.
I'm running Linux Mint 18.2 in a VirutalBox VM.
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davidparks21 almost 3 yearsWhat's the difference between
free.(buff/cache)
and(buff)
in this answer? It's not clear where you're getting the(buff)
value from.free.used
andfree.(buff/cache)
are clearly from the output of runningfree
. -
Vlad Frolov almost 3 years@davidparks21 as far as I recall, the thing is that you cannot find pure
(buff)
, butmemory.usage_in_bytes
seems to only include the cache