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The ExaNeSt and EuroExa H2020 EU-funded projects aim to design and develop anexascale ready computing platform prototype based on low-energy-consumptionARM64 cores and FPGA accelerators. We participate in the application-drivendesign of the hardware solutions and prototype validation. To carry on thiswork we are using, among others, Hy-Nbody, a state-of-the-art direct N-bodycode. Core algorithms of Hy-Nbody have been improved in such a way toincreasingly fit them to the exascale target platform. Waiting for the ExaNestprototype release, we are performing tests and code tuning operations on anARM64 SoC facility: a SLURM managed HPC cluster based on 64-bit ARMv8Cortex-A72/Cortex-A53 core design and powered by a Mali-T864 embedded GPU. Inparallel, we are porting a kernel of Hy-Nbody on FPGA aiming to test andcompare the performance-per-watt of our algorithms on different platforms. Inthis paper we describe how we re-engineered the application and we show firstresults on ARM SoC.

Astrophysical code migration into Exascale Era