From michal.skrivanek at redhat.com Fri Oct 7 08:52:17 2016 Content-Type: multipart/mixed; boundary="===============4597088508170276830==" MIME-Version: 1.0 From: Michal Skrivanek To: users at ovirt.org Subject: Re: [ovirt-users] ovirt-ha-agent cpu usage Date: Fri, 07 Oct 2016 14:52:14 +0200 Message-ID: <1E88D630-847C-4374-9AE1-8712FD0E2BA2@redhat.com> In-Reply-To: CAMRbyysChgmmWvSB32DyemfS67Hj65DW_E3wyvhXvOYfOeEsBQ@mail.gmail.com --===============4597088508170276830== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable --Apple-Mail=3D_7EB9EF8C-BE5A-48FF-82EF-9D77E5D03B01 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=3Dutf-8 > On 7 Oct 2016, at 14:42, Nir Soffer wrote: >=3D20 > On Wed, Oct 5, 2016 at 1:33 PM, Simone Tiraboschi > wrote: >=3D20 >=3D20 > On Wed, Oct 5, 2016 at 10:34 AM, Nir Soffer > wrote: > On Wed, Oct 5, 2016 at 10:24 AM, Simone Tiraboschi =3D > wrote: >=3D20 >=3D20 > On Wed, Oct 5, 2016 at 9:17 AM, gregor > wrote: > Hi, >=3D20 > 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. >=3D20 > Yes, it's due to the fact that ovirt-ha-agent periodically reconnects =3D over json rpc and this is CPU intensive since the client has to parse =3D the yaml API specification each time it connects. wasn=3DE2=3D80=3D99t it suppose to be fixed to reuse the connection? Like a= ll =3D the other clients (vdsm migration code:-)=3D20 Does schema validation matter then if there would be only one connection = =3D at the start up? >=3D20 > Simone, reusing the connection is good idea anyway, but what you =3D describe is=3D20 > a bug in the client library. The library does *not* need to load and =3D parse the > schema at all for sending requests to vdsm. >=3D20 > The schema is only needed if you want to verify request parameters, > or provide online help, these are not needed in a client library. >=3D20 > Please file an infra bug about it. >=3D20 > Done, https://bugzilla.redhat.com/show_bug.cgi?id=3D3D1381899 =3D >=3D20 > Here is a patch that should eliminate most most of the problem: > https://gerrit.ovirt.org/65230 >=3D20 > Would be nice if it can be tested on the system showing this problem. >=3D20 > Cheers, > Nir > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users --Apple-Mail=3D_7EB9EF8C-BE5A-48FF-82EF-9D77E5D03B01 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=3Dutf-8
On 7 Oct 2016, at 14:42, Nir Soffer <nsoffer(a)redhat.com> =3D wrote:

On Wed, Oct 5, 2016 at 1:33 PM, Simone Tiraboschi = =3D <stirabos(a)redhat.com> =3D wrote:


On Wed, Oct 5, 2016 at =3D 10:34 AM, Nir Soffer <nsoffer(a)redhat.com> wrote:
On Wed, Oct 5, 2016 at 10:24 AM,= =3D Simone Tiraboschi <stirabos(a)redhat.com> wrote:

On Wed, Oct 5,= =3D 2016 at 9:17 AM, gregor <gregor_forum(a)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 =3D is
no VM running but ovirt-ha-agent uses heavily the CPU.

Y= es, =3D it's due to the fact that ovirt-ha-agent periodically reconnects over =3D json rpc and this is CPU intensive since the client has to parse the =3D yaml API specification each time it connects.

wasn=3DE2=3D80=3D99t it suppose to be fi= xed =3D to reuse the connection? Like all the other clients (vdsm migration =3D code:-) 
Does schema validation matter then if there =3D would be only one connection at the start up?


Simone, reusin= g =3D the connection is good idea anyway, but what you describe =3D is 
a bug in the client library. The library = =3D does *not* need to load and parse the
schema at all = =3D for sending requests to vdsm.

The schema is only needed if you want = =3D to verify request parameters,
or provide online =3D help, these are not needed in a client library.

Please file an infra bug about =3D it.

Done, https://bugzilla.redhat.com/show_bug.cgi?id=3D3D1381899

Here is a pat= ch =3D that should eliminate most most of the problem:
https://gerrit.ovirt.org/65230

Would be nice if it c= an =3D be tested on the system showing this problem.

Cheers,
Nir
_______________________________________________
Users =3D mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users

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