This program applies a 3x3 top-hat filter to a randomly generated 2D array. The boundaries are treated as periodic in both directions. The code is written in C++ on an MPI+Kokkos framework.

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Required packages

• cmake 3.10+
• Kokkos package
• CUDA-Aware MPI package

Building and running the code

Linux

We can follow the standard cmake procedure for building the code and mpirun for code execution.

mkdir build; cd build
cmake ..
make
mpirun -np 4 ./topHat

Testing the code

The code is tested in Linux machines with A100 and A5000 GPUs that has Kokkos version 4.3.01 and openmpi version 5.0.3. The openmpi package is built with CUDA Aware support.