Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 11, issue 8
Articles | Volume 11, issue 8
https://doi.org/10.5194/gmd-11-3409-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-11-3409-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 11, issue 8
Methods for assessment of models
 | 
22 Aug 2018
Methods for assessment of models |  | 22 Aug 2018

Simulation of the performance and scalability of message passing interface (MPI) communications of atmospheric models running on exascale supercomputers

Yongjun Zheng and Philippe Marguinaud

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Short summary
The impacts of collective algorithms, interconnect topologies, and routing algorithms on the performance and scalability of transpositions, halo exchanges, and allreduce operations are significant. The performance of communications can be improved when the congestion is mitigated by a proper configuration of the topology and a congestion-balanced routing algorithm. The scalability of the spectral models could be acceptable for exascale supercomputers.
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