[lxc-users] lxd process using lots of CPU

[Stéphane Graber]

On Fri, Mar 10, 2017 at 03:01:02AM +0900, Tomasz Chmielewski wrote:
> On 2017-03-10 01:52, Stéphane Graber wrote:
> 
> > Do you see a flood of events if you run "lxc monitor --type=logging"?
> 
> Nope, just this:
> 
> # lxc monitor --type=logging
> metadata:
>   context: {}
>   level: dbug
>   message: 'New events listener: 9e429089-289b-4ab8-9965-069054e7371c'
> timestamp: 2017-03-09T18:57:56.311175444+01:00
> type: logging

Hmm, then it matches another such report I've seen where some of the
threads are reported as using a lot of CPU, yet when trying to trace
them you don't actually see anything.

Can you try to run "strace -p" on the various threads that are reported
as eating all your CPU?

The similar report I got of this would just show them stuck on a futex,
which wouldn't explain the CPU use. And unfortunately it looked like
tracing the threads actually somehow fixed the CPU problem for that
user...


If you just want the problem gone, "systemctl restart lxd" should fix
things without interrupting your containers, but we'd definitely like to
figure this one out if we can.

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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