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Learn about how the high-level directive-based, widely popular, programming model, OpenACC can help port radiation transport scientific codes to large scale heterogeneous systems consisting of state-of-the-art accelerators such as GPUs. Architectures are rapidly evolving and the exascale machines are expected to offer billion-way concurrency. We need to rethink algorithms, languages, programming models among other components in order to increase parallelism from a programming standpoint to be able to migrate large scale applications to these massively powerful platforms. This talk will discuss programming challenges and its corresponding solutions for porting a wavefront based miniapplication for Denovo, which is a production code for nuclear reactor modeling, using OpenACC. Our OpenACC implementation running on NVIDIA's next-generation Volta GPU boasts a 85.06x speedup over serial code, which is larger than CUDA's 83.72x speedup over the same serial implementation.
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