Supercomputers/Systems/Pratyush
India · operational · hpc
Pratyush
Operated by IITM at IITM (Pashan, Pune) .
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
- 3.76 PFlop/s
- Rpeak
- 4.01 PFlop/s
- Rmax ÷ Rpeak
- 93.8%
- Cores
- 119,232
- Power
- 1.35 MW
- Per watt
- 2.8 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 | - Cray XC40 | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Verified | top500.orgglobenewswire.com |
| CPU | Intel Xeon E5-2695 v4 CPUs x86-64 · 18C · 2.1 GHz · 14 nm · 120 W Intel Xeon E5-2695 v4 18C 2.1GHz, dual-socket nodes | Intel | 6,624 estimated | Reported | top500.org |
| Interconnect | Cray Aries Interconnect Dragonfly · About 10 GB/s per direction · Around 1 microsecond Cray Aries dragonfly interconnect | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Verified | top500.orgglobenewswire.com |
| Storage | - Cray ClusterStor storage systems, part of an 18 PB pool shared across the IITM and NCMRWF installations under the same contract; no generation or model number is named in the source we fetched | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | globenewswire.com |
| Operating system | Cray Linux Environment Operating systems Linux, Cray-customised · Proprietary layer over open-source Linux Cray Linux Environment | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.org |
The read
A Cray XC40 at the Indian Institute of Tropical Meteorology in Pune, part of a $67 million Ministry of Earth Sciences contract with Cray announced in January 2018 that also delivered the smaller Mihir system (a separate Cray XC40) to NCMRWF in Noida; TOP500 carries the two as separate system entries and this dataset follows that split, recording only the IITM Pune machine here. 119,232 Intel Xeon E5-2695 v4 cores in dual-socket nodes on Cray's Aries dragonfly interconnect, running Cray Linux Environment. Cray's own release and TOP500 independently agree on the vendor, interconnect family and site, so the tier is verified; TOP500 alone gives the exact Rmax, Rpeak, core count and power draw. Cray states both machines were accepted in late 2017; TOP500 records 2018 as the installation year and first listed Pratyush 39th on the June 2018 list. Most Indian press quotes 6.8 PFlop/s peak for 'Pratyush', which is the combined Pune-plus-Noida figure from the same contract; the Rmax and Rpeak recorded here are TOP500's figures for the Pune machine alone.
Timeline
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
- 2026-09-22 Added with a rank pointer; TOP500 and this dataset follow the IITM/NCMRWF split, recording only the IITM Pune machine
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 |
|---|---|---|
| globenewswire.com | names system and part | Cray Aries, Cray Linux Environment |
| top500.org | names system and part | Intel Xeon E5-2695 v4, Cray Aries, Cray Linux Environment |
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
Latency-optimised versus throughput-optimised processors, NUMA, and the end of the host-to-device copy.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.