QSG_RENDER_LOOP woes

[Martin Gräßlin]

On Friday 09 May 2014 16:29:32 Sebastian Kügler wrote:
> On Friday, May 09, 2014 16:03:31 Martin Gräßlin wrote:
> > On Friday 09 May 2014 15:56:53 Sebastian Kügler wrote:
> > > Since 30d2489930 in plasma-workspace, we're setting the QSG_RENDER_LOOP
> > > to
> > > "basic", if it's not specified otherwise by an env var. This has been
> > > done
> > > to prevent crashes in the threaded renderer, but unfortunately, it seems
> > > to
> > > come with its own set of problems: Plasma produces artifacts, high CPU
> > > load
> > > and grinds to a complete halt after a while.
> > > 
> > > 
> > > 
> > > I've tried setting the QSG_RENDER_LOOP to threaded, and that does indeed
> > > prevent those problems, but obviously, plasma-shell is more crashy with
> > > it.
> > > Now some of those crashes (at least one I've observed) is indeed in the
> > > scenegraph, but I've also seen other crashes (one in groupmanager of the
> > > taskbar, indirectly, not sure if that's related).
> > > 
> > > 
> > > 
> > > I think we might need to revisit this patch, and find a "stable" way
> > > forward. Just switching to basic renderloop doesn't seem to be the
> > > solution. :/
> > 
> > Please note that Qt itself switched it off for all of Mesa. The change now
> > was  more to only have one possible way of usage and preventing us hunting
> > down non-reproducable bugs.
> > 
> > The crashes we see with threaded render loop cannot be fixed or worked
> > around  if I understand the Qt commit disabling it for all of Mesa
> > correctly. Have a look at the plasma-devel archives, I sent a FYI mail
> > some
> > time back.
> 
> I remember that one. That email doesn't say much, except for your "basic
> works for me" in kwin. I didn't see any problems with kwin, only with
> plasma-shell, and I only changed it for plasma-shell in my tests: that made
> a difference (on Intel).

no I think I meant another mail, try 
http://comments.gmane.org/gmane.comp.kde.devel.plasma/30179

:-)

Cheers
Martin
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