[ovirt-devel] [VDSM] rhel6.5 vs rhel7 performance in sampling

[Francesco Romani]

----- Original Message -----
> From: "Nir Soffer" <nsoffer at redhat.com>
> To: "Francesco Romani" <fromani at redhat.com>
> Cc: devel at ovirt.org, "Federico Simoncelli" <fsimonce at redhat.com>
> Sent: Thursday, July 31, 2014 4:16:04 PM
> Subject: Re: [ovirt-devel] [VDSM] rhel6.5 vs rhel7 performance in sampling
> > Nothing fancy here, just the differences from RHEL6.5 to RHEL7.
> > See the attached graphs:
> > * baseline_{cpu,mem}.png is RHEL 6.5
> > * baseline_{cpu,mem}_7.png is RHEL 7.0
> > RHEL7 is so *much* better, switching the hypervisor host is by far
> > the biggest (and easiest) gain we achieved so far.
> 
> Are these showing the current vdsm code, before the scalable_sampling
> branch?

exactly. Plain vanilla master.

> > 
> > coming soon:
> > - discussion about the impact of the scalable_sampling topic branch
> 
> I want to see the numbers the new graphs

sure, is the very next thing

> > PS: a couple of updates about specific points (Michal, Nir)
> > - still no luck with yappi on RHEL7, managed to do the above bench
> >   with 10 VMs and collected a profile.
> 
> Can you share the profile with us?

please find attached.

> > - 30751 is a win, same of the last changes of
> > http://gerrit.ovirt.org/#/c/29980/
> >   (revs 12, 13)
> 
> More details?

Yep, let me just re-run benchmarks to highlight the impact changes on isolation.

After that I'll send a followup mail discussing the impact of 
- our new topic branch
- our new topic branch + 30751
on both RHEL 6.5 and 7.0

not sure if it is worth to bench 29980 v13 directly or to have one set for
29980 v11 and one for 29980 v13

Bests,

-- 
Francesco Romani
RedHat Engineering Virtualization R & D
Phone: 8261328
IRC: fromani
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