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

[Michal Skrivanek]

> 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 <mailto:michal.skrivanek at redhat.com>> wrote:
> 
>> On 7 Oct 2016, at 14:42, Nir Soffer <nsoffer at redhat.com <mailto:nsoffer at redhat.com>> wrote:
>> 
>> On Wed, Oct 5, 2016 at 1:33 PM, Simone Tiraboschi <stirabos at redhat.com <mailto:stirabos at redhat.com>> wrote:
>> 
>> 
>> On Wed, Oct 5, 2016 at 10:34 AM, Nir Soffer <nsoffer at redhat.com <mailto:nsoffer at redhat.com>> wrote:
>> On Wed, Oct 5, 2016 at 10:24 AM, Simone Tiraboschi <stirabos at redhat.com <mailto:stirabos at redhat.com>> wrote:
>> 
>> 
>> On Wed, Oct 5, 2016 at 9:17 AM, gregor <gregor_forum at catrix.at <mailto: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

>  
> 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.

> 
> 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 <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 <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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