[lxc-users] NUMA and LXC

[CDR]

That seems to be a way to confine a container to a single NUMA node.
What Hyper-V does is guarantee that no virtual machine will ever use
memory outside the node, whatever node it was started on, and they
choose the nodes for us.
Does it make any sense o this is a dream?

On Fri, May 9, 2014 at 2:12 PM, Serge Hallyn <serge.hallyn at ubuntu.com> wrote:
> That goes into the container config.  If you wanted all containers on
> the same node you could put it into /etc/lxc/default.conf before creating
> containers.
>
> Quoting CDR (venefax at gmail.com):
>> ..and that goes in the container's config or in the master lxc config file?
>> So ask, I am still getting the handle on LXC
>>
>> On Fri, May 9, 2014 at 12:46 PM, Serge Hallyn <serge.hallyn at ubuntu.com> wrote:
>> > lxc.cgroup.cpuset.mems = 1
>> >
>> > Quoting CDR (venefax at gmail.com):
>> >> I think we need to add a configuration to the global lxc.conf whereas
>> >> any given container may run only on one NUMA node, and if that is not
>> >> possible, it should not even start.
>> >>
>> >> The performance for a container that is contained, so to speak, in  a
>> >> single NUMA node, should be much higher that a container that has its
>> >> processes all over the place.
>> >>
>> >> I noticed this in Hyper-V virtual machines, where you may set this
>> >> restriction. The performance as measured by hdparm tT  --direct is
>> >> twice than a virtual machine started without this feature.
>> >>
>> >> This is the distance between nodes, as reported by numactl --hardware
>> >>
>> >> node distances:
>> >> node   0   1   2   3
>> >>   0:  10  20  20  20
>> >>   1:  20  10  20  20
>> >>   2:  20  20  10  20
>> >>   3:  20  20  20  10
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