Supercomputers/Systems/Reedbush-L
Japan · decommissioned · mixed
Reedbush-L
Also known as Reedbush (GPU 4 per node)
Operated by University of Tokyo .
Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 1092 of 1153 systems have a readable citation that names them, and 40 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.
Measured performance
- Rmax
- 810.00 TFlop/s
- Rpeak
- 1.43 PFlop/s
- Rmax ÷ Rpeak
- 56.6%
- Cores
- 16,640
- Power
- 79.24 kW
- Per watt
- 10.2 GF/W
Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.
What this machine is made of
One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.
| Role | Part | Supplier at build | Quantity | Confidence | Source |
|---|---|---|---|---|---|
| Integrator | - SGI Rackable C1102-GP8, 64 nodes | Hewlett Packard Enterprise | - | Reported | top500.orgcc.u-tokyo.ac.jp |
| Accelerator | NVIDIA Tesla P100 Accelerators CUDA (Pascal GP100) · 3,584C · 1.48 GHz · 16 nm · 300 W 64 nodes with four Tesla P100 NVLink each (256 GPUs) | NVIDIA | 256 reported | Verified | cc.u-tokyo.ac.jptop500.org |
| CPU | Intel Xeon E5-2695 v4 CPUs x86-64 · 18C · 2.1 GHz · 14 nm · 120 W Xeon E5-2695v4 18C 2.1GHz, two per node | Intel | 128 estimated | Reported | top500.org |
| Interconnect | Mellanox InfiniBand EDR Interconnect Fat tree · 100 Gb/s per 4x port · About 0.9 microseconds Infiniband EDR | NVIDIA | - | Reported | top500.org |
The read
University of Tokyo Information Technology Center GPU subsystem: 64 SGI Rackable C1102-GP8 nodes, each with two Xeon E5-2695 v4 and four NVLink Tesla P100 (256 GPUs), 1,435 TFLOPS peak on InfiniBand EDR. Part of the Reedbush complex sharing a 5.04 PB Lustre file system. Ranked 292nd on the November 2017 TOP500. Reedbush service ended in November 2021.
Timeline
- 2017 First operational source
- 2017-11 List debut at #292 (November 2017) source
- 2021-11 Decommissioned source
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-02 Added Reedbush-L, the University of Tokyo's NVLink P100 subsystem, 292nd on the November 2017 TOP500
Source check
We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.
| Cited source | Result | Found on the page |
|---|---|---|
| cc.u-tokyo.ac.jp | names system, part and count | NVIDIA Tesla P100, Intel Xeon E5-2695 v4, Mellanox InfiniBand EDR · counts: 256 |
| top500.org | names system and part | NVIDIA Tesla P100, Intel Xeon E5-2695 v4, Mellanox InfiniBand EDR |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.
Inside a node
Why accelerators exist, what the memory hierarchy costs, and how the CPU and accelerator merged onto one package.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.