India · operational · hpc

Mihir

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: 2.57 PFlop/s
Rpeak: 2.81 PFlop/s
Rmax ÷ Rpeak: 91.5%
Cores: 83,592
Power: 954.73 kW
Per watt: 2.7 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.org globenewswire.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 INTCNASDAQ	-	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.org globenewswire.com
Storage	- Cray ClusterStor storage, part of an 18 PB pool shared across the IITM and NCMRWF installations under the same contract	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	globenewswire.com

The read

The smaller half of the same $67 million Ministry of Earth Sciences contract with Cray that also produced Pratyush, already in this dataset: a Cray XC40 installed at NCMRWF in Noida and dedicated to running India's daily operational weather forecasts, distinct from Pratyush's research mandate at IITM Pune. Cray's own GlobeNewswire release and TOP500 independently agree on the vendor, the Aries interconnect and the Noida site, which is why the tier is verified, mirroring the reasoning already recorded for Pratyush; TOP500 alone gives the exact Rmax, Rpeak, core count and power draw. Both machines were accepted in late 2017 and Mihir first appeared on the June 2018 TOP500 list at rank 66. Most Indian press quotes the combined 6.8 PFlop/s peak for the pair rather than Mihir's figure alone; the Rpeak recorded here is TOP500's figure for this machine specifically.

Timeline

2017 First operational source
2018-01 Announced source
2018-06 List debut at #66 (June 2018) source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#66: TOP500, June 2018 →

Site & facility

NCMRWF (Noida)

Location: Noida, India
Commissioned: 2017

globenewswire.com top500.org

Change history

2026-09-24 Mihir added, NCMRWF's operational-forecast Cray XC40 in Noida

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	does not name this system	Cray Aries
top500.org	names system and part	Intel Xeon E5-2695 v4, Cray Aries

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.