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CUDA-aware MPI

Arndt, Daniel requested to merge github/fork/masterleinad/cuda_aware_mpi_actual_master into master

Created by: masterleinad

I still need to clean this up. In particular, the preprocessor variables are not going to stay, but will be replaced by a CMake option. So far, I was testing this with

  • 60 MPI processes,
  • 10^7 points/MPI process,
  • 10^6 queries/MPI process,
  • and a varying number of neighbors for the knn search,
  • and CUDA

using the distributed_tree_driver benchmark.

neighbors old new
10 2.4e0 3.7e0
20 4.9e0 5.8e0
40 1.0e1 1.0e1
80 2.2e1 2.0e1
100 2.8e1 2.5e1
120 3.3e1 3.0e1
140 4.0e1 3.4e1
160 4.6e1 3.9e1

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