Another nice thing about Kwin-- something Canonical may use once Wayland and KDE 5 hits. Because of how they are restructuring the frameworks and the classes in KDE 5 the idea is that you could use Kwin as your window manager even if you dont have KDE-meta installed. It will use KDElibs if they are available, but otherwise will drop back to pure QT. I know Unity 2D was QT based, and since Kwin supports plugins like Compiz did, Canonical may be wise to go a QT route for Unity 3D and use Kwin as the window manager.
Originally Posted by bachinchi
Although I like compiz, I switched to Gnome Shell. It seems to give me less "glitchiness" than the rest and work fine without any system setting tampering(even on KWin I don't quite agree with the defaults, like "Undirect Fullscreen Windows" not on by default, although it used to be .. :/ )
Also, it has a good combination of features and customization(extensions are nigh omnipotent it seems) with being lightweight( ~400 megs of total ram isn't bad for me, especially on my loaded Ubuntu with Catalyst[opensource radeon seems to takes much less ram] )
Of course KWin also seems to run pretty smooth, but I tend to have to tweak it .. Activate anti-aliasing for fonts, undirect fullscreen windows and a couple things to make it "perfect" .. But things seem to actually run very smooth in it other than that(except a few times with fullscreen apps probably).
But I think that some technical details aren't bad to know. I was reading in a blog of a Gnome developer(at least if I recall correctly) that compiz giving less FPS doesn't mean it has slow code. What I've understood is with xorg applications pretty much send frames and hope for the best, there's no inherent mechanism to time frames with screen refresh and it's a relatively tough thing to implement, with its fair share of traps and difficulties. So timing the frames and reducing delays(often not because something is executed, the wm/compositor might be waiting to see if something will refresh, and this could cause it to miss the refresh and not render the frame, while it could) can be more important than executing fast redraws etc in cases. And I think this is the thing with compiz. Of course it's not an excuse after all those years. But I think with wayland it will indeed be easier to correct all those misbehaviors, as it provides better mechanisms in timing the frames with the screen refresh(again, if I've understood correctly till now .. there's people who know this stuff much better than I do).
And I hope it does .. It's supposed to actually give real tear free video too(wayland), so it should be able to help with that and general tearing I assume
(tearing is closely connected to the mentioned timing as far as I know)
Especially all those ARM servers running Ubuntu will really miss all their compiz effects and Unity ..
Originally Posted by Article
The results are surprising, considering some major rework has been done which is supposed to reduce wakeups, CPU usage and improve performance dramatically. Maybe it's another new regression somewhere, or some problems with the driver. Hopefully this shit will get sorted soon, and it's only a minor thing left to do.
Some games, simply won't unredirect to fullscreen properly with compiz, and that causes a major performance hit.
One of the best games on Linux, Trine 2, simply runs like crap with compiz.
Kwin have its flaws with nvidia drivers, because there´ s still window tearing with vsync and moving and resizing windows are slow.
Uh... did you even read Michael's latest test results comparing KDE(Kwin)/Gnome Shell(Mutter)/XFCE/Unity(Compiz)?
Originally Posted by Ericg
Gnome Shell (Mutter) was faster than Kwin in almost every test, sometimes by a significant margin too! Sure Kwin is faster than Unity, but so is everything else... The conclusion was, that Gnome-Shell and XFCE were the best performing desktops across all gfx driver platforms.
Also, implying that all the developers jumped in to support Kwin is quite misleading.. I seriously doubt KDE has more users/developers than Gnome or Unity.
Last edited by gururise; 09-04-2012 at 05:49 PM.
This crap is the only reason I don't use unity. I really like unity's interface, but goddamn is unity/compiz slow as hell on my intel ironlake card. Just bringing up the dash over a video playing will bring things to a crawl.
Gnome-shell has just as much eye candy and runs fast as hell on this card, and is also FAR less buggy. I get random crashes and bad performance with unity/compiz, while gnome-shell/mutter is always smooth and stable. I really wish Canonical had stuck with mutter for unity instead of making the poor decision to scrap it for compiz. Say what you want about gnome-shell but they have done a great job giving an absolutely smooth composited desktop. No graphical glitches, no tearing, stable, and animations are always smooth, good all around performance, which is all I really want from a 3d desktop.
Kwin also runs great on this card since kde 4.8, compiz is the only one that runs so poorly.
Last edited by bwat47; 09-04-2012 at 05:45 PM.
compiz ran great with gnome-panel. throw unity on there and it's a turd.
Originally Posted by bwat47
granted compiz has undergone significant rework since the gnome-panel days.
And did you read Martin's response? The performance difference is because of a changed default (unredirection of full screen windows).
Originally Posted by gururise
Yeah, I know. Most users will only ever use the defaults. And (currently) Kwin is out-of-the-box less performant that Mutter. I don't really know the reasoning of this change. Anyone have an idea?
Last edited by bachinchi; 09-04-2012 at 06:20 PM.
Originally Posted by Ericg
Mutter, at last check,was the best perfoming of the modern (excluding enlightenment's which I have no idea of the performance, though I expect it to be excellent).compositing WMs. Kwin was also very close to mutter's performance.
Perhaps Phoronix will do a roundup soon.
Try to not use fullscreen, but windowed, and set the game resolution to the screen's resolution. Not.sure if that will really help, but it works with some games.
Originally Posted by narciso