[ovirt-users] ovirt-ha-agent cpu usage

[Simone Tiraboschi]

On Fri, Oct 7, 2016 at 3:25 PM, Michal Skrivanek <
michal.skrivanek at redhat.com> wrote:

>
> On 7 Oct 2016, at 14:59, Nir Soffer <nsoffer at redhat.com> wrote:
>
> On Fri, Oct 7, 2016 at 3:52 PM, Michal Skrivanek <
> michal.skrivanek at redhat.com> wrote:
>
>>
>> On 7 Oct 2016, at 14:42, Nir Soffer <nsoffer at redhat.com> wrote:
>>
>> On Wed, Oct 5, 2016 at 1:33 PM, Simone Tiraboschi <stirabos at redhat.com>
>> wrote:
>>
>>>
>>>
>>> On Wed, Oct 5, 2016 at 10:34 AM, Nir Soffer <nsoffer at redhat.com> wrote:
>>>
>>>> On Wed, Oct 5, 2016 at 10:24 AM, Simone Tiraboschi <stirabos at redhat.com
>>>> > wrote:
>>>>
>>>>>
>>>>>
>>>>> On Wed, Oct 5, 2016 at 9:17 AM, gregor <gregor_forum at catrix.at> wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> did you found a solution or cause for this high CPU usage?
>>>>>> I have installed the self hosted engine on another server and there is
>>>>>> no VM running but ovirt-ha-agent uses heavily the CPU.
>>>>>>
>>>>>
>>>>> Yes, it's due to the fact that ovirt-ha-agent periodically reconnects
>>>>> over json rpc and this is CPU intensive since the client has to parse the
>>>>> yaml API specification each time it connects.
>>>>>
>>>>
>> wasn’t it suppose to be fixed to reuse the connection? Like all the other
>> clients (vdsm migration code:-)
>>
>
> This is orthogonal issue.
>
>
> Yes it is. And that’s the issue;-)
> Both are wrong, but by “fixing” the schema validation only you lose the
> motivation to fix the meaningless wasteful reconnect
>

Yes, we are going to fix that too (
https://bugzilla.redhat.com/show_bug.cgi?id=1349829 ) but it would require
also https://bugzilla.redhat.com/show_bug.cgi?id=1376843 to be fixed.


>
>
>
>> Does schema validation matter then if there would be only one connection
>> at the start up?
>>
>
> Loading once does not help command line tools like vdsClient,
> hosted-engine and
> vdsm-tool.
>
>
> none of the other tools is using json-rpc.
>

hosted-engine-setup is, and sooner or later we'll have to migrate also the
remaining tools since xmlrpc has been deprecated with 4.0


>
>
> Nir
>
>
>>
>>
>>>> Simone, reusing the connection is good idea anyway, but what you
>>>> describe is
>>>> a bug in the client library. The library does *not* need to load and
>>>> parse the
>>>> schema at all for sending requests to vdsm.
>>>>
>>>> The schema is only needed if you want to verify request parameters,
>>>> or provide online help, these are not needed in a client library.
>>>>
>>>> Please file an infra bug about it.
>>>>
>>>
>>> Done, https://bugzilla.redhat.com/show_bug.cgi?id=1381899
>>>
>>
>> Here is a patch that should eliminate most most of the problem:
>> https://gerrit.ovirt.org/65230
>>
>> Would be nice if it can be tested on the system showing this problem.
>>
>> Cheers,
>> Nir
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>>
>>
>>
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