[systemd-devel] MemoryLimit for user unit

[Kai Krakow]

Am Sun, 12 Nov 2017 18:14:38 +0100
schrieb Stefan Schweter <stefan at schweter.it>:

> Hi systemd-users,
> 
> I tried to add a memory limit for a user service unit (inspired by
> [1]), it looks like:
> 
> [Service]
> # ....
> MemoryAccounting=true
> MemoryLimit=1G
> 
> Now the problem is that the (user) service consumes more than 1G
> without being terminated.

As far as I could see, this limits the amount of RAM occupied. It
doesn't stop the memory from being swapped out. You need to limit swap
memory, too. Take note that swap accounting may have noticeable
overheads and as such is not enabled by default on many systems.


> htop shows a memory consumption of 1.4 GB. The output of
> `systemd-cgtop` is:
> 
> Control Group                             Tasks   %CPU   Memory
> Input/s Output/s
> /                                             -    1.5
> 1.7G        -
> 
> /user.slice                                  46    0.4
> 14.3M        -
> 
> /user.slice/user-1001.slice                  46    0.4
> 14.2M        -
> 
> /init.scope                                   1      -
> 1.4M        -
> 
> /system.slice
> 
> 
> So my question is how would MemoryLimit= work for a user unit?

Maybe you want to apply the limit to a slice? Your output of cgtop
doesn't show any service units...


-- 
Regards,
Kai

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