Near-global climate simulation at 1 km resolution: establishing a performance baseline on 4888 GPUs with COSMO 5.0
The best hope for reducing long-standing global climate model biases is by increasing resolution to the kilometer scale. Here we present results from an ultrahigh-resolution non-hydrostatic climate model for a near-global setup running on the full Piz Daint supercomputer on 4888 GPUs (graphics p...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-05-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://www.geosci-model-dev.net/11/1665/2018/gmd-11-1665-2018.pdf |
| Summary: | The best hope for reducing long-standing global climate model biases is by
increasing resolution to the kilometer scale. Here we present results from an
ultrahigh-resolution non-hydrostatic climate model for a near-global setup
running on the full Piz Daint supercomputer on 4888 GPUs (graphics
processing units). The dynamical core of the model has been completely
rewritten using a domain-specific language (DSL) for performance portability
across different hardware architectures. Physical parameterizations and
diagnostics have been ported using compiler directives. To our knowledge this
represents the first complete atmospheric model being run entirely on
accelerators on this scale. At a grid spacing of 930 m (1.9 km), we achieve
a simulation throughput of 0.043 (0.23) simulated years per day and an energy
consumption of 596 MWh per simulated year. Furthermore, we propose a new
memory usage efficiency (MUE) metric that considers how efficiently the
memory bandwidth – the dominant bottleneck of climate codes – is being
used. |
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| ISSN: | 1991-959X 1991-9603 |