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Ookami [3] is a computer technology testbed supported by the United States National Science Foundation. It provides researchers with access to the A64FX processor developed by Fujitsu [17] in collaboration with RIKΞN [35, 37] for the Japanese path to exascale computing, as deployed in Fugaku [36], the fastest computer in the world [34]. By focusing on crucial architectural details, the ARMbased, multi-core, 512-bit SIMD-vector processor with ultrahighbandwidth memory promises to retain familiar and successful programming models while achieving very high performance for a

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