Re: High CPU on latest nightly
On Wed, 2015-03-04 at 08:04 +0100, drago01 wrote:
On Wed, Mar 4, 2015 at 2:40 AM, Adam Williamson <
adamwill(a)fedoraproject.org> 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