Path tracing benchmark

mpeterson · 2017-11-30T16:23:09

It took some time after we build up our first coherent traversal kernel for avx512 http://ompf2.com/viewtopic.php?f=3&t=2103 to get a competitive incoherent kernel ready for prime time. Here it is ! For the benchmark we used a full pipeline available easily on any architecture: 1) camera ray generation, traversal, intersection, shading 2) for any hit: 64 secondary diffuse rays, traversal, intersection and shading Architectures: 1) Nvidia 1080GTX kernels are based on: "Understanding the Efficiency of Ray Traversal on GPUs" 2) Embree 2.13 avx512 kernels on intel phi 7250 1.4ghz, 68 cores: Kernels: - avx512knl::BVH8Triangle4Intersector16HybridMoellerNoFilter for camera rays and - avx512knl::BVH8Triangle4Intersector1Moeller for secondary diffuse rays Bvh-Compiler Settings: - avx512knl::BVH8BuilderFastSpatialSAH 3) Our new avx512 kernels for coherent and incoherent ray transport on intel phi 7250 1.4ghz, 68 cores Our new kernels clearly outperform any other implementation on all important platforms currently used for path tracing. Looking at the knl cpu there is another advantage: We can directly connect to high performance networks like infiniband to scale extremely good compared to gpus in a cluster-like configuration. At the end we also implemented/migrated our fast bvh compilers http://rapt.technology/data/pssbvh.pdf to avx512. The compiler timings for all scenes above are: Fairy: 13.6ms Runghold: 105.1ms San Miguel: 359.3ms Sponza: 7.1ms The embree compilers in any configuration are far behind these timings on our knl test-system. Therefore we decided not to publish any numbers here. The sbvh compiler used in "Understanding the Efficiency of Ray Traversal on GPUs" is far away from being optimized at all. mp

Graphics and GPU Programming Programming

Started by mpeterson January 25, 2017 01:21 PM

11 comments, last by Infinisearch 7 years, 2 months ago

mpeterson

Author

215

November 30, 2017 09:58 AM

13 hours ago, Infinisearch said:
Just so you know intel is making there own GPU division now. (they hired Raja Koduri, former head of RTG(Radeon Technology Group)) of AMD). Also IIRC they canceled the next Xenon Phi, but the one after that is still on the roadmap.

intel already tried to make a gpu. they failed badly. koduri had very bad standing at amd after his last design had no great success

on the market => he had to leave. knights series is fully canceled. dont believe in any roadmaps for dummies. the distance to accl. of any sort is too big for intel and arm is entering the intel domain. dont bet on them any longer !

Infinisearch

3,058

November 30, 2017 04:23 PM

6 hours ago, mpeterson said:
intel already tried to make a gpu. they failed badly.

If you're talking about Larrabee then it wasn't exactly a failure, in fact it was the basis of the Xeon Phi.

-potential energy is easily made kinetic-

Path tracing benchmark

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Path tracing benchmark

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