Matt Martineau, Simon McIntosh-Smith, M. Boulton, W. Gaudin
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An Evaluation of Emerging Many-Core Parallel Programming Models
In this work we directly evaluate several emerging parallel programming models: Kokkos, RAJA, OpenACC, and OpenMP 4.0, against the mature CUDA and OpenCL APIs. Each model has been used to port TeaLeaf, a miniature proxy application, or mini-app, that solves the heat conduction equation, and belongs to the Mantevo suite of applications. We find that the best performance is achieved with device-tuned implementations but that, in many cases, the performance portable models are able to solve the same problems to within a 5-20% performance penalty. The models expose varying levels of complexity to the developer, and they all present reasonable performance. We believe that complexity will become the major influencer in the long-term adoption of such models.
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