Fugaku (Japanese: 富岳) is a petascale supercomputer at the Riken Center for Computational Science in Kobe, Japan.

[5] It became the fastest supercomputer in the world in the June 2020 TOP500 list[6] as well as becoming the first ARM architecture-based computer to achieve this.

This CPU is based on the ARM version 8.2A processor architecture, and adopts the Scalable Vector Extensions for supercomputers.

[11][12] The initial (June 2020) configuration of Fugaku used 158,976 A64FX CPUs joined using Fujitsu's proprietary torus fusion interconnect.

The LLIO system stages data in and out of a second-level Fujitsu Exascale File System (FEFS), which uses disk-based storage based on Lustre software to provide a large persistent high-performance filesystem,[17][18] and a tape-based archive to store a large volume of infrequently accessed data.

[19] A description of that benchmark is as follows: The solver method of choice is a combination of LU factorization and iterative refinement performed afterwards to bring the solution back to 64-bit accuracy.

[13] In 2020, Fugaku also attained top spots in other rankings that test computers on different workloads, including Graph500, HPL-AI, and HPCG benchmark.

[31] In June 2020, Fugaku became the fastest supercomputer in the world in the TOP500 list, displacing the IBM Summit.