[Lxc-users] Container swap usage question

[Victor Leschuk]

Daniel, 

Thank you for your advice. I have just checked it and it seems to work!


On Tue, 31 Aug 2010 15:56:50 +0200
Daniel Lezcano <daniel.lezcano at free.fr> wrote:

> On 08/31/2010 09:30 AM, Victor Leschuk wrote:
> > Hello all,
> >
> > I have been playing with LXC for few days and I got a question.
> >
> > I am using a simple container without OS and network just to launch
> > applications with certain resource limits using lxc-execute.
> >
> > Here is a configuration:
> >
> > $ cat lxc-test.conf
> > lxc.utsname = test
> > lxc.cgroup.memory.limit_in_bytes = 40M
> > lxc.cgroup.memory.swappiness = 0
> >
> >
> > The problem is that memory.swappiness cgroup parameter doesn't
> > affect container swap usage. As far as I understood, setting this
> > parameter to 0 should prevent container from using swap at all,
> 
> swappiness is like:
> 
> " /proc/sys/vm/swappiness
> The value in this file controls how aggressively the kernel will swap 
> memory pages. Higher val‐
> ues increase agressiveness, lower values descrease aggressiveness.
> The default value is 60."
> 
> but related to a group of processes, allowing you to assign a
> "priority" between the containers.
> 
> I am not sure (to be tested), but:
> 
> memory.memsw.limit_in_bytes : sets memory+swap
> and
> memory.limit_in_bytes : sets memory only
> 
> So maybe if you assign the same values for both, that will implies
> swap = 0
> 
> Thanks
> -- Daniel