National Supercomputing Mission lists 40 systems and 68 petaflops

India has 40 supercomputers in service under the National Supercomputing Mission, with a combined capacity of 68 petaflops. The figure is the one the Press Information Bureau's public material is carrying into this week's science calendar, ahead of ESTIC-2026. Thirteen of the systems are above 1 petaflop. Twelve sit in the mid range, between 500 teraflops and 1 petaflop.

The mission was approved in April 2015 with an outlay of ₹4,500 crore. The Department of Science and Technology and the Ministry of Electronics and Information Technology steer it. C-DAC in Pune and the Indian Institute of Science in Bengaluru implement it. The early machines were assembled with imported processors. The current phase, described as PARAM Rudra, uses servers designed in India, a domestic high-speed interconnect, and local liquid-cooling parts.

C-DAC has transferred the Rudra server-board design to Indian electronics manufacturers. More than 6,000 of those server units are in service. The interconnect is the less visible piece. A supercomputer is a pile of servers only if the switch between them can move data at the rate the processors need. The mission's claim on that point is a switch designed and tested in India, now connecting multi-node clusters.

Sixty-eight petaflops is a stock, not a rank. It does not by itself place India on the Top500 list, which counts individual machines, not a national pool. A 68-petaflop pool spread across 40 systems is a different object from one 68-petaflop machine. The 13 systems above 1 petaflop are the ones that can sit in a global table. The mid-range twelve are the ones most universities will actually queue on.

The split is the useful fact in the PIB note. High-end systems take the weather models, the defence calculations and the large molecular jobs. Mid-range systems take the campus workloads that used to leave the country as batch files. A mission that only built flagships would leave those files on a foreign queue. A mission that only built small clusters would have no machine for a national forecast. The 13 and the 12 are the answer the programme is offering to both demands.

The ₹4,500 crore outlay dates from 2015. A reader comparing it with the cost of a single new exascale machine abroad will find the Indian number small. The Indian number bought 40 systems and a server design that Indian plants can now build. That is a different purchase from one machine at the top of a list.

What the public note does not give is the utilisation of the 68 petaflops, or the share of jobs that still run outside the country. Capacity installed is not capacity used. The 6,000 Rudra units and the native switch are the parts a lab can point to. The queue times are the part still missing from the brief.

Until ESTIC publishes a job table, the checkable line is the inventory: 40 systems, 68 petaflops, 13 above 1 petaflop, 12 between 500 teraflops and 1 petaflop, more than 6,000 indigenous server units, under a mission approved in April 2015 for ₹4,500 crore.

ESTIC-2026 is the meeting the inventory is being quoted into. A conference does not add a petaflop. It does put the 40 systems in front of users who will ask for time. The missing table, utilisation and foreign overflow, is what those users already know from their own queues. A national stock of 68 petaflops that is full is a different policy problem from a stock that is idle.

The Rudra phase is the break with the first years of the mission, when machines were built around imported processors and the Indian share was the building and the staff. A server board transferred to an Indian manufacturer is a part that can be ordered again. A switch designed in India is a part that does not wait on an export licence. Those two facts are the self-reliance claim, and they are narrower than a claim that the whole machine is indigenous.

The number to remember from the public note is not a ranking. It is an inventory with a shape: 13 large, 12 mid-range, 40 in all, 68 petaflops together, 6,000-plus Rudra units underneath. That shape is what ₹4,500 crore, approved in April 2015, has produced by this week.