GW4 Tier-2 HPC Centre for Advanced Architectures

这项由布里斯托尔牵头的提案来自成功的Isambard Tier-2 HPC服务背后的财团[1]：由巴斯、布里斯托尔、加的夫和埃克塞特组成的GW4联盟，与克雷和英国气象局合作。Isambard提供了世界上第一个基于ARM的生产型HPC服务，在这一过程中对世界各地的HPC社区产生了重大影响。Isambard 2项目的目标是在这一成功的基础上，增加下一代激动人心的、支持艾斯卡的基于ARM的技术(富士通的A64fx)，同时大幅扩展和升级当前的服务，以满足不断增长的需求。A64fx处理器正在引起人们的兴奋，因为它提供的内存带宽和浮点功能更像是图形处理器，而不是CPU(分别约为1TB/S和3万亿浮点/S的双精度)。在提供这些变革性技术的同时，将基于ARM的生产系统扩展为国家服务，这将对英国的HPC社区非常有利，可以支持未来亿级系统的代码移植和优化(日本理研院的Fugaku系统只是已知的基于A64fx的一个例子)。Isambard 2系统还将提供世界上最全面的多架构比较系统(MACs)之一，显著扩展成功的Isambard 1 Mac。能够将下一代技术与一组不断更新的同类最佳CPU和GPU进行比较，这是任何科学严谨的架构评估的关键部分。作为克雷系统，我们将继续独一无二地向第2级社区提供其行业领先的软件工具链，这是实现从第3级到第2级到第1级的向上移动的关键功能。[1]https://gw4-isambard.github.io/docs/

This proposal, led by Bristol, is from the Consortium behind the successful Isambard Tier-2 HPC service [1]: the GW4 Alliance of Bath, Bristol, Cardiff and Exeter, in partnership with Cray and the Met Office. Isambard delivered the world's first production, Arm-based HPC service, creating significant impact for the world-wide HPC community in the process. The Isambard 2 project aims to build on this success, adding the next generation of exciting, Exascale-enabling, Arm-based technologies (Fujitsu's A64fx), while significantly expanding and upgrading the current service to meet growing demand. The A64fx CPU is generating excitement because it delivers memory bandwidth and floating point capability that is more like a GPU than a CPU (approximately 1 TeraByte/s and 3 TeraFLOP/s double precision, respectively). Providing access to these transformational technologies in parallel with an expanded Arm-based production system as a national service would be extremely advantageous to the UK's HPC community, supporting the porting and optimising of codes for future Exascale systems (the Fugaku system at RIKEN in Japan is just one example known to be based on A64fx). The Isambard 2 system will also provide one of the world's most comprehensive Multi Architecture Comparison System (MACS), significantly expanding the successful Isambard 1 MACS. The ability to compare next generation technologies with a constantly updated set of best-in-class CPUs and GPUs is a crucial part of any scientifically rigorous architectural evaluation. Being a Cray system, we will continue to uniquely offer their class-leading software toolchain to the Tier-2 community, a crucial capability to enable upward mobility from Tier-3 through Tier-2 to Tier-1.[1] https://gw4-isambard.github.io/docs/