Re: High CPU on latest nightly

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On Wed, 2015-03-04 at 08:04 +0100, drago01 wrote:
> On Wed, Mar 4, 2015 at 2:40 AM, Adam Williamson <
> adamwill@xxxxxxxxxxxxxxxxx> wrote:
> > On Tue, 2015-03-03 at 17:00 -0800, Adam Williamson wrote:
> > > On Tue, 2015-03-03 at 04:59 -0500, Kamil Paral wrote:
> > > > > On Mon, 2015-03-02 at 22:46 +0000, Alexander Bisogianis 
> > > > > wrote:
> > > > > > > I'm not seeing anything like that on my F22 desktop.
> > > > > > > 
> > > > > > 
> > > > > > I mean while installing F22, all four CPUs on the KVM host
> > > > > > (F21) are constantly at 100% usage.
> > > > > > 
> > > > > > Running top in TTY2, while F22 is installing, I see:
> > > > > > 
> > > > > > Xorg using constantly CPU 60%-70%
> > > > > > 2 anaconda processes using constantly CPU 60%-70%
> > > > > > 
> > > > > > I can understand anaconda, but Xorg?
> > > > > 
> > > > > IIRC there's a spinner or something similar visible during
> > > > > install; it could well be caused by that. I even think I 
> > > > > caught some discussion about a patch to disable it during 
> > > > > automated
> > > > > test runs or something in #anaconda the other day...
> > > > 
> > > > Alexander, try running the installation with this boot option:
> > > > 
> > > > inst.updates=https://kparal.fedorapeople.org/tmp/no-spinner.img
> > > > 
> > > > It should disable spinner animation. Then compare the CPU 
> > > > usage. I still haven't gotten to reporting it as a bug, but 
> > > > it's true that the spinner seems to be a *gigantic* 
> > > > performance hog, making all our installations take much 
> > > > longer, especially in VMs.
> > > 
> > > Now I come to notice it, GTKSpinners don't seem to spin at all 
> > > in TC7 and TC8. They do spin on my desktop. Not sure if there's a
> > > package difference or it's a KVM vs. real hardware thing, but
> > > they're broken with at least both 'vga' and 'qxl' in a KVM. Just 
> > > burning a USB stick to see if it's the same on bare metal. 
> > > Probably GTK+ 3.15.9 is involved.
> > 
> > Huh, it's odder than that - GtkSpinners apparently don't spin in 
> > GNOME on a KVM, but they *do* spin in the installer environment.
> 
> That's not really a bug. There is a xsettings key
> "Gtk/EnableAnimations" that gets disabled if the system is using 
> software rendering (or if it is a remote system) to improve
> performance.
> There is no "full gnome" in the installer environment so nothing 
> disables the key but in the user session ...

yeah, mclasen said the same. still, it's a problem that spinners are 
so CPU heavy. it's maybe not noticeable in a typical install, but on 
an openQA setup we have 4-8 installs running simultaneously on a 
single host, and the combination causes major load.
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net

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