Supercomputers/Systems/UTokyo SR8000/MPP
Japan · decommissioned · hpc
UTokyo SR8000/MPP
Also known as Hitachi SR8000/MPP at the University of Tokyo
Operated by University of Tokyo at University of Tokyo Computer Centre .
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
- 1.71 TFlop/s
- Rpeak
- 2.07 TFlop/s
- Rmax ÷ Rpeak
- 82.4%
- Cores
- 1,152
- Power
- -
- Per watt
- - 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 | - Hitachi built the SR8000/MPP | Hitachi | - | Reported | cc.u-tokyo.ac.jptop500.org |
| Operating system | Hitachi HI-UX/MPP Operating systems Unix (Mach 3.0 microkernel), Hitachi-customised · Proprietary Hitachi HI-UX/MPP operating system | Hitachi | - | Reported | top500.org |
The read
The 144-node Hitachi SR8000/MPP at the University of Tokyo's Information Technology Center, successor to the 128-node SR8000. The centre's past-systems page gives an operating period of 2001 to 2007, 16 GB per node and 2,073.6 GFlop/s peak. TOP500 lists 1,152 cores at 2,074 GFlop/s Rpeak and 1,709.1 GFlop/s Rmax under HI-UX/MPP on a multi-dimensional crossbar, fifth on the June 2001 list and last at rank 473 in November 2005 (https://www.top500.org/system/170767/). TOP500 is the only source for Rmax, so the tier is reported.
Timeline
- 2001 First operational source
- 2001-06 List debut at #5 (June 2001) source
- 2007 Decommissioned source
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Change history
- 2026-10-09 Added UTokyo SR8000/MPP
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 and part | Hitachi HI-UX/MPP |
| top500.org | names system and part | Hitachi HI-UX/MPP |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.