Supercomputer Fugaku
RIKEN Center for Computational Science runs Fugaku in Kobe as Japan's national flagship supercomputer, open to academic and industrial researchers in Japan and abroad through HPCI project calls screened by RIST.
What it runs and how to get time
From the operator- How to get time How researchers or customers get time on the system, naming the allocation programme where the operator states one.
- HPCI calls via RIST: General/Junior Researchers and Industrial Use projects, plus Fugaku Trial Access for first-time users 4
- Cooling Cooling design stated by the operator or supplier.
- Mostly water cooled, with a 9:1 water-to-air cooling ratio; expanded chillers, heat exchangers and pumps 6
- Power design Facility power, energy supply or heat reuse as stated by the operator. Not the benchmark power in the Power column.
- Fed by the site's existing cogeneration plant and high-voltage substation, expanded for about twice the K computer's power use 6
- Facility Building, data centre or campus that houses the system, as described by the operator.
- RIKEN Center for Computational Science, Kobe, Japan 5
- Upgrade or successor Announced upgrade, expansion, successor or retirement plan, with dates where the operator gives them.
- Successor FugakuNEXT (Fujitsu CPUs plus NVIDIA GPUs, ~40 MW) to start operation around 2030 on land next to RIKEN's Kobe campus 7
- Production start Month the operator says the system entered production.
- 2021-03 5
Benchmark and hardware
Source per value- Rank Position in the TOP500 edition named in the Edition column. Historic systems keep the rank of the edition where they last appeared.
- 9 1
- Rmax PFLOP/s Measured double-precision LINPACK (HPL) performance of the listed configuration. Older TFLOP/s and GFLOP/s figures are converted to PFLOP/s.
- 442.01 1
- Rpeak PFLOP/s Theoretical peak double-precision performance of the listed configuration. This is not AI or mixed-precision throughput.
- 537.21 1
- HPL efficiency % Rmax divided by Rpeak: the share of theoretical peak the system delivered on LINPACK. Computed from the two sourced figures.
- 82.3 1
- Power kW Power reported for the benchmark run. Measurement boundaries vary by site; this is not facility power, TDP or cooling capacity. Empty when the system does not report it.
- 29,899 1
- Efficiency GFLOP/s per W Rmax per watt of reported benchmark power, computed from the two sourced figures (GFLOP/s per W). Empty when power is not reported.
- 14.78 1
- Site Host or operator named by TOP500 for the installation.
- RIKEN Center for Computational Science 1
- Country Country or region reported by TOP500 for the site.
- Japan 1
- Region World region of the installation country (grouping applied by this site).
- Asia-Pacific 1
- Vendor Manufacturer or system supplier exactly as submitted to TOP500.
- Fujitsu 1
- Vendor group Supplier grouped for filtering. Bull is the Eviden/Atos line; Other covers single-system suppliers.
- Fujitsu 1
- System model Hardware platform in the cited TOP500 edition.
- Supercomputer Fugaku 1
- Processor CPU description in the cited TOP500 edition; clock and core count refer to the processor model.
- A64FX 48C 2.2GHz 1
- Accelerator vendor Maker of the accelerator. None listed means TOP500 names no accelerator for the system.
- None listed 1
- Interconnect Network fabric exactly as listed in the cited TOP500 edition.
- Tofu interconnect D 1
- Fabric Interconnect family derived from the listed interconnect (grouping applied by this site).
- Tofu 1
- Cores cores Total cores submitted to TOP500, including accelerator cores where TOP500 counts them. Not a CPU-only count and not a CUDA-core count.
- 7,630,848 1
- Installed Installation year reported in the TOP500 system record. Not necessarily the year of production acceptance.
- 2020 2
- Edition TOP500 edition (YYYY-MM) that supplies the ranking and benchmark data. A historic edition does not assert current operating status.
- 2026-06 1
- OS Operating system from the TOP500 system record.
- Red Hat Enterprise Linux 2
- TOP500 record Link to the TOP500 database record for this exact submission.
- https://www.top500.org/system/179807/ 2
- Nodes nodes Compute node count as described by the operator. It can exceed the nodes used in the benchmark run.
- 158,976 3
Sources
- TOP500 list, June 2026 accessed 2026-11-11
- TOP500 system record accessed 2026-11-11
- r-ccs.riken.jp (operator page) accessed 2026-11-11
- How to Use | RIKEN Center for Computational Science accessed 2026-11-11
- Shared use of Fugaku begins accessed 2026-11-11
- Supporting Facilities | RIKEN Center for Computational Science accessed 2026-11-11
- RIKEN launches international initiative with Fujitsu and NVIDIA for "FugakuNEXT" development accessed 2026-11-11