[lxc-users] Does cpu cgroup has been enabled in lxc/lxd
kemi.wang at intel.com
Thu Nov 1 06:38:38 UTC 2018
On 2018/11/1 下午1:35, kemi wrote:
> Hi, Fajar
> thx for your reply.
> On 2018/11/1 下午1:26, Fajar A. Nugraha wrote:
>> On Thu, Nov 1, 2018 at 8:55 AM, kemi <kemi.wang at intel.com> wrote:
>>> Hi, Everyone
>>> I am new comer of LXC/LXD community, and want to run a container on a
>>> limited cpu set.
>>> The followings are my steps:
>>> a) lxd init
>>> b) lxc launch Ubuntu:18.04 first
>>> c) lxc stop first
>>> d) lxc config set first limits.cpu 0 // set container running on CPU 0
>> I'm not sure, but I believe "0" here means all cpu, and not pin to cpu 0?
> Hmm, I expected to pin on CPU 0. Seems I misunderstood the *limit* configuration here:)
> I will try use another number as you suggested.
>> Try changing this to "1", "0-0", and "1-2". Observe the difference.
have tried. `nproc` works well.
>>> e) lxc start first
>>> f) lxc exec first -- bash
>>> g) nproc // the expected result would be 1, however, it still equals
>>> to cpu number of host
>>> h) ls /sys/devices/system/cpu // the expected result should only
>>> include cpu0 directory, however, it's not
>> g) and h) read files from /proc, not cgroup. You need lxcfs. You should
>> already have that on ubuntu though.
/proc/cpuinfo also matches the expected result.
However, it seems that sysfs in container still shares with host /sys file system.
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