Energy-efficient multigrid smoothers and grid transfer operators on multi-core and GPU clusters
We investigate time and energy to solution for the CPU- and GPU-based execution of the compute intensive smoother and grid transfer operators in a geometric multigrid linear solver. We use a hybrid parallel implementation for both shared and distributed memory multi-core host systems comprising CUDA...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2017
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| In: |
Journal of parallel and distributed computing
Year: 2016, Volume: 100, Pages: 181-192 |
| DOI: | 10.1016/j.jpdc.2016.05.006 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1016/j.jpdc.2016.05.006 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0743731516300363 
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| Author Notes: | Martin Wlotzka, Vincent Heuveline |
| Summary: | We investigate time and energy to solution for the CPU- and GPU-based execution of the compute intensive smoother and grid transfer operators in a geometric multigrid linear solver. We use a hybrid parallel implementation for both shared and distributed memory multi-core host systems comprising CUDA-capable devices. Our numerical experiments are designed to assess the effect of combining an MPI-parallel multigrid framework with OpenMP host threads or CUDA accelerators instead of MPI-only CPU computations for various parallel setups. We present runtime and energy measurements from a quad-CPU test system equipped with two GPUs. We find that using an accelerated asynchronous smoother can yield substantial savings of time and energy to solution over using a host-only Jacobi smoother in small and medium sized host systems with one or two multi-core CPUs. The acceleration of the grid transfer operators also yields a benefit, yet smaller than the benefit from the smoother. For large host systems a hybrid MPI-OpenMP parallelization turns out to be most beneficial with respect to energy consumption, although it is not the fastest option. |
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| Item Description: | Gesehen am 01.10.2018 |
| Physical Description: | Online Resource |
| DOI: | 10.1016/j.jpdc.2016.05.006 |