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

[Michal Skrivanek]

> 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 <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:-) 
Does schema validation matter then if there would be only one connection at the start up?

> 
> 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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