Preparing for HPC on RISC-V: Examining Vectorization and Distributed Performance of an Astrophysics Application with HPX and Kokkos

In recent years, interest in RISC-V computing architectures has moved from academic to mainstream, especially in the field of High Performance Computing where energy limitations are increasingly a concern. As of this year, the first single board RISC-V CPUs implementing the finalized ratified vector...

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Veröffentlicht in:SC24-W: Workshops of the International Conference for High Performance Computing, Networking, Storage and Analysis S. 1656 - 1665
Hauptverfasser: Diehl, Patrick, Syskakis, Panagiotis, Dais, Gregor, Brandt, Steven R., Kheirkhahan, Alireza, Singanaboina, Srinivas Yadav, Marcello, Dominic, Taylor, Chris, Leidel, John, Kaiser, Hartmut
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: IEEE 17.11.2024
Schlagworte:
Astrophysics
asynchronous many-task system
Computer architecture
Europe
Hardware
High performance computing
HPX
Kokkos
Libraries
Power demand
RISC-V
scalable vector extensions
Supercomputers
task-based run time system
Vector processors
vectorization
Vectors
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Zusammenfassung:In recent years, interest in RISC-V computing architectures has moved from academic to mainstream, especially in the field of High Performance Computing where energy limitations are increasingly a concern. As of this year, the first single board RISC-V CPUs implementing the finalized ratified vector specification are being released. The RISC-V vector specification follows in the tradition of vector processors found in the CDC STAR-100, the Cray-1, the Convex C-Series, and the NEC SX machines and accelerators. The family of vector processors offers support for variable-length array processing as opposed to the fixed-length processing functionality offered by SIMD. Vector processors offer opportunities to perform vector-chaining which allows temporary results to be used without the need to resolve memory references.In this work, we use the Octo-Tiger multi-physics, multi-scale, 3D adaptive mesh refinement astrophysics application to study these early RISC-V chips with vector machine support. We report on our experience in porting this modern C++ code (which is built upon several open-source libraries such as HPX and Kokkos) to RISC-V. In addition, we show the impact of the RISC-V Vector extension on a RISC-V single board computer by implementing the std :: experimental:simd interface and integrating it with our code. We also compare the application's performance, scalability, and power consumption on desktop-grade RISC-V computer to an A64FX system.The results presented in this paper are part of a longer-term evaluation of RISC-V's viability for HPC applications.
DOI:10.1109/SCW63240.2024.00207