Re: Inexplicable memory usage after move to Debian9
On Fri 27 Apr 2018 at 12:26:11 (+0000), Eduardo M KALINOWSKI wrote:
> On sex, 27 abr 2018, Simon Beirnaert wrote:
> >The bottom line for me is that I when I shut down everything I install
> >and manage on the system, it's still conuming about half a gig more
> >than a system running the exact same base image right after use, without
> >the extra memory being accounted for by monitoring tools.
>
> How are you determining what you call "consumed memory"?
>
> Keep in mind that the kernel will by default use almost all free
> memory (not actually used by processes and libraries) as cache
> space, because it makes no sense to leave memory just laying around.
> However, once it's really needed, the caches will be dropped. Thus
> "free" memory is usually reported as low. Compare with "available"
> memory as reported by free.
In which case, this could be a useful recipe:
# free -m
total used free shared buffers cached
Mem: 2016 1251 764 0 301 774
-/+ buffers/cache: 175 1840
Swap: 3861 0 3861
# echo 3 > /proc/sys/vm/drop_caches
# free -m
total used free shared buffers cached
Mem: 2016 119 1896 0 0 24
-/+ buffers/cache: 94 1921
Swap: 3861 0 3861
#
Now you can watch it creep up again.
Cheers,
David.
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