In the field of climate modeling, researchers at the Toulouse-based "LAERO Laboratoire d'Aerologie" benefited from a year-long collaboration with experts CINES and HPE, for the porting and scaling on AMD Instinct Meso-NH gas pedals, a leading non-hydrostatic atmospheric model, using Cray compiler OpenACC support and ensuring bit reproducibility requirements. The results of this work will be presented at the SC'23 conference in Denver. They also completed a Grand Challenge on 128 hybrid nodes (512 GPU AMD Instinct™ MI250X / 1,024 GCD - Graphic Compute Dies) in modeling past extreme weather conditions at a grid resolution of 1.5 billion points with an unprecedented resolution of 100 m (Giga- LES). These simulations have contributed to the study of recent storms in the Atlantic (Storm Alex over Brittany in October 2020) and the Mediterranean, including extreme wind gusts.
Les Simulation performed by “LAERO Laboratoire d’Aerologie” of extreme wind gusts over Brittany using AMD Instinct accelerators Meso-NH on Adastra supercomputer
In the field of new energy development, a CERFACS team ported the AVBP code and carried out a high-fidelity LES simulation of an 80-turbine wind farm. The objective was to study vortex wake effects that could lead to a decrease in wind speed behind the turbine and an increase in fatigue loads in a Grand Challenge using 16 Adastra hybrid nodes (64 GPU AMD Instinct™ MI250X / 128 GCD - Graphic Compute Dies).
In the field of high-resolution of the first few kilometers of the Earth's crust, crucial for the energy transition (massification of gas storage, extraction of resources used for solar/wind energy or the next generation of batteries) a team from the consortium SEISCOPE performed on 49,152 4thcores AMD EPYC™ "Zen4" from Adastra using an allocation of 28 million core hours, unprecedented modeling of 3D maps of wave propagation velocity, density and a quality factor characterizing underground attenuation comprising over 123 million pixels, with a resolution of several tens of meters. The following image shows a comparison at 10 Hz and 22.5 Hz of the velocity model (Figure 1), and an image cube derived from velocity and density (Figure 2). The gain in detail is striking!
Cross-section at z=200 m of the acoustic wave propagation velocity model obtained at 10 Hz (top) and 22.5 Hz (bottom). In the first case, the model contains around 15 million pixels for a resolution of around 100 m. In the second case, the model contains over 123 million pixels, for a resolution of around 50 m.
These scientific results were obtained before entering full production mode on Adastra, and after completion of the GENCI-funded Progress Contract. These enabled joint teams of application owners and experts from HPE, AMD and CINES to offload existing scalar applications onto GPUs and compare Apple-to-apple TTS / ETS (Time To Solution / Energy To Solution) between one (1) scalar node (based on 4thgeneration AMD ™ processors) and one (1) accelerated node (based on AMD Instinct MI250X gas pedals).
In October 2023, in order to amplify this momentum, GENCI and CINES decided to use an initial Adastra extension based on 112 AMD Instinct™ MI300A APUs integrated in a new HPE Cray EX4000 cabinet equipped with 14 HPE Cray EX255a gas pedal blades, 28 nodes, each with 4 AMD Instinct™ MI300A APUs, each APU connected to an HPE Slingshot 11 NIC@200 Gbit/s interconnect.
Thanks to its innovative APU architecture, this future AMD Instinct™ MI300A partition is designed to offer French researchers increased support in the convergence of HPC and AI applications by providing a coherent single-memory computing system federating both general-purpose (scalar) and accelerated resources on the same socket.
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