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GNOME Shell No Longer Requires GPU Acceleration
An anonymous reader writes "The GNOME 3.0 Shell with the Mutter window manager no longer requires GPU acceleration to work, while still retaining the compositing window manager and OpenGL support. GNOME Shell can now work entirely on the CPU using the LLVM compiler via the Gallium3D LLVMpipe driver. This will be another change to Fedora 17 to no longer depend upon the GNOME3 fall-back, which is expected to eventually be deprecated and further anger GNOME2 fans."
GNOME is a perfect study in how not to architect a software system. Everything about it is wrong.
The first mistake they made was trying to cobble half-assed object-oriented support onto C, rather than just using C++ or Objective-C. Everything about GObject is stupid and counterproductive. It makes writing code a real pain in the ass, since you need to use typecasting macros all over the place. Worse, this sort of code promotes library design that's slow and inefficient. To make it even worse, this style of C code is so convoluted that it is not optimized well by compilers, resulting in binaries that are far slower than they should be.
It basically goes totally downhill after that. This bullshit with GPU acceleration being required in the first place, and then this additional bullshit involving LLVM, is yet another in a long list of flaws and horrible decisions.
I encourage all of the developers that I mentor to use GNOME and to get a good look at its internals. I just make sure that they know not to do what GNOME has done. By seeing the mistakes firsthand, it's less likely that they'll repeat them in the future with the software that they create.
Not the GP, but what he's saying is far more true to my experience than what you're saying. I don't think the GP's comment is spreading FUD, either, but just a truth that many GNOME'ers don't want to hear.
Have you ever tried to use the GObject bindings for other languages? The Python bindings are the only ones that aren't terrible, but they weren't that good either. The rest were very incomplete, very outdated, or didn't exist at all. The theoretical benefits or capabilities of GObject are worthless if we can't use them in practice. I've had a lot more success with interoperability between Java, Scala, and Clojure than I ever have had with any GObject-based code. The same goes for .NET when the languages are C#, VB.NET and F#. Those all work seamlessly with almost no effort, while GObject needs a lot of hand-holding and even then it often just doesn't work.
What the GP says about some C compilers not doing a good job optimizing unusual C code is correct, too. I used to work on a compiler that generated C for a proprietary OO language and this artificial C code confused the optimizers of several popular C compilers. We got much better performance when we wrote our own native back-end. So I could totally see some of GNOME's bad performance being caused by this.
Also, KDE is very good evidence to back up the GP's claims. It's comparable in size and complexity to GNOME, but is written using C++ instead of C. On every computer I've ever used, KDE has been a lot faster than GNOME. It is also a far nicer environment to work with when you're writing code. OO programming is more natural in C++ than it is in C using GObject.
Don't write off the GP's comments as FUD. There's a lot of evidence to show that they're real problems.