GREAT stuff, Marek!
But sadly some crashes.
Is my LLVM git version to old?
7. Jan 2019 (short before 8.0 cut)
LLVM (http://llvm.org/):
LLVM version 8.0.0svn
Optimized build.
Default target: x86_64-unknown-linux-gnu
Host CPU: nehalem
Registered Targets:
amdgcn - AMD GCN GPUs
r600 - AMD GPUs HD2XXX-HD6XXX
x86 - 32-bit X86: Pentium-Pro and above
x86-64 - 64-bit X86: EM64T and AMD64
Please have a look at my post @Phoronix:
https://www.phoronix.com/forums/forum/phoronix/latest-phoronix-articles/1079916-radeonsi-picks-up-primitive-culling-with-async-compute-for-performance-wins?p=1079984#post1079984
Thanks,
Dieter
Am 13.02.2019 06:15, schrieb Marek Olšák:
Hi,
This patch series uses async compute to do primitive culling before
the vertex shader. It significantly improves performance for
applications
that use a lot of geometry that is invisible because primitives don't
intersect sample points or there are a lot of back faces, etc.
It passes 99.9999% of all tests (GL CTS, dEQP, piglit) and is 100%
stable.
It supports all chips all the way from Sea Islands to Radeon VII.
As you can see in the results marked (ENABLED) in the picture below,
it destroys our competition (The GeForce results are from a Phoronix
article from 2017, the latest ones I could find):
Benchmark: ParaView - Many Spheres - 2560x1440
https://people.freedesktop.org/~mareko/prim-discard-cs-results.png
The last patch describes the implementation and functional limitations
if you can find the huge code comment, so I'm not gonna do that here.
I decided to enable this optimization on all Pro graphics cards.
The reason is that I haven't had time to benchmark games.
This decision may be changed based on community feedback, etc.
People using the Pro graphics cards can disable this by setting
AMD_DEBUG=nopd, and people using consumer graphics cards can enable
this by setting AMD_DEBUG=pd. So you always have a choice.
Eventually we might also enable this on consumer graphics cards for
those
games that benefit. It might decrease performance if there is not
enough
invisible geometry.
Branch:
https://cgit.freedesktop.org/~mareko/mesa/log/?h=prim-discard-cs
Please review.
Thanks,
Marek
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