2016 Proceeding
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Extreme-scaling applications en route to exascale
Feedback from the previous year's very successful workshop motivated the organisation of a three-day workshop from 1 to 3 February 2016, during which the 28-rack JUQUEEN BlueGene/Q system with 458 752 cores was reserved for over 50 hours. Eight ...
ASAGI: A Parallel Server for Adaptive Geoinformation
We present ASAGI, an open-source library with a simple interface to access Cartesian material and geographic datasets in massively parallel simulations with dynamically adaptive mesh refinement (AMR). ASAGI distributes geographic datasets over all ...
On rounding error resilience, maximal attainable accuracy and parallel performance of the pipelined Conjugate Gradients method for large-scale linear systems in PETSc
Pipelined Krylov solvers typically display better strong scaling compared to standard Krylov methods for large linear systems. The synchronization bottleneck is mitigated by overlapping time-consuming global communications with computations. To achieve ...
Parallel performance of h-type Adaptive Mesh Refinement for Nek5000
We discuss parallel performance of h-type Adaptive Mesh Refinement (AMR) developed for the high-order spectral element solver Nek5000 within CRESTA project. AMR is a desired feature of the future simulation software, as it gives possibility to increase ...
On the Strong Scaling of the Spectral Element Solver Nek5000 on Petascale Systems
- Nicolas Offermans,
- Oana Marin,
- Michel Schanen,
- Jing Gong,
- Paul Fischer,
- Philipp Schlatter,
- Aleks Obabko,
- Adam Peplinski,
- Maxwell Hutchinson,
- Elia Merzari
The present work is targeted at performing a strong scaling study of the high-order spectral element fluid dynamics solver Nek5000. Prior studies such as [5] indicated a recommendable metric for strong scalability from a theoretical viewpoint, which we ...
On the trade-offs between energy to solution and runtime for real-world CFD test-cases
This paper provides an insight into the optimisation of runtime and energy performance for two widely-used CFD codes. Energy efficiency is a hot-topic in HPC and methods to reduce the energy consumption of large machines are an active area of research. ...