Developments concerning the parallel input and output (IO) in the parallel version of UnTRIM with a special attention for its efficiency are presented. The usage of MPI IO (developed ca. 2010) and of the highly specialised libraries like HDF5 or NetCDF (developments in 2018 and 2019) is discussed and assessed from the point of view of engineering practice and the efficiency of parallel IO systems ubiquitous in the present-day high performance computers.
Transparencies for a talk presented on 16th UnTRIM Workshop held in Trento, 13-15th May 2019 are available.
The presentation summarizes in a rather informal and philosophical, but thoroughly informative way the development history of the MPI version of UnTRIM ten years after finalizing the parallel code applied subsequently for practical projects at BAW.
Transparencies from the talk delivered on 15th UnTRIM Workshop in Trento (28-30th May 2018) are available.
Two subsequent presentations on the 13th UnTRIM Workshop 2016 with the same title Efficient river modelling applying subgrid technology (UnTRIM2), the first part concerning concept and grids, presented by Regina Patzwahl, and the second part concerning results, presented by Jacek A. Jankowski. Continue reading →
E. Rustico, J. Jankowski, A. Hérault, G. Bilotta and C. Del Negro
Abstract: We present a restructured version of GPUSPH, a CUDA-based implementation of SPH. The new version is extended to allow execution on multiple GPUs on one or more host nodes, making it possible to concurrently exploit hundreds of devices across a network, allowing the simulation on larger domains and at higher resolutions. Partitioning of the computational domain is not limited anymore to parallel planes and can follow arbitrary, user-defined shapes at the resolution of individual cells, where the cell is defined by the auxiliary grid used for fast neighbor search. Continue reading →