This is a simplified 2D Brownian dynamics simulation program implemented in CUDA used to benchmark curand and random123 libraries against OpenRAND in Paper "OpenRAND: A Performance Portable, Reproducible Random Number Generation Library for Parallel Computations."
One million particles are simulated for 10000 steps. The particles are acted upon by two forces- a drag force proportional to velocity and a random uniform force. The main kernel, apply_forces, is quite simple.
Please run make to compile the program, making sure to modify the GPU arch beforehand. The curand, r123 and openrand executables will be generated.
To check OpenRAND is reproducible, simply run ./openrand twice. The output should be identical.
./openrand > a.txt
./openrand > b.txt
cmp a.txt b.txt