LXC Guest not clearing memory buffers/cache

S

sg86

New Member
Jan 5, 2017
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Hi, so I'm running "zoneminder" software on a LXC container, I've assigned it plenty of RAM which i keep increasing because its swapping.

Digging further i see that it is incorrectly reporting actual RAM usage, it is sitting (in HTOP), at 27GB / 22 GB


"free -hm" shows only 10mb free, 22GB of the usage is sitting in buffers/cache.

Code: 
              total        used        free      shared  buff/cache   available
Mem:            22G        1.1G         10M        6.6G         20G         10M
Swap:          4.0G          0B        4.0G

When i stop zoneminder it sits like below forever seemingly.

Code: 
              total        used        free      shared  buff/cache   available
Mem:            22G        719M        6.4G        821M         14G        6.4G
Swap:          4.0G          0B        4.0G

Now I have spoken with the zoneminder developers and they say this is an issue with LXC not being able to clear its buffers, is there something i can do? Am i able to make proxmox clear these when they reach dangerous levels?

What is also quite annoying is proxmox "summary" UI shows that only 4-5GB of RAM are used, not the 22GB shown on this single guest
 
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Reactions: keith123
I am having the exact same issue as you have mentioned. also looking for a fix.
Have you found anything yet yourself?
 
Hello,

I have made a temporary work around for myself, if its any use for you. it works fine for my ZoneMinder.

when I run
"cat /proc/meminfo" I see all the used memory in Cached never clears.
I run "sync; echo 1 > /proc/sys/vm/drop_caches" to clear the PageCache and see my ZoneMinder vM in proxmox clear up 3 GB of RAM.

I now just have a cron task to run every 2 hours to execute "/bin/sync; echo 1 > /proc/sys/vm/drop_caches" and no longer have the issue.
Still its just a hacky work around
 
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