Article · Wikipedia archive · Last revised Jun 5, 2026

Cielo (supercomputer)

Cielo was a United States supercomputer located at Los Alamos National Laboratory. Built by Cray Inc, the computer was part of the Advanced Simulation and Computing Program to maintain the United States nuclear stockpile.

Last revised
Jun 5, 2026
Read time
≈ 1 min
Length
192 w
Citations
9
Source
Cielo
OperatorsNational Nuclear Security Administration
LocationLos Alamos National Laboratory
ArchitectureCray XE6 with Dual AMD Opteron™ 6136 eight-core “Magny-Cours” Socket G34 @ 2.4 GHz1
Power3.98 Mega Watts1
Space3000 square feet (278.7 m2)1
Memory286 terabytes DDR3 @ 1333 MHz1
Storage7.6 PB User Available Capacity1
Speed1,110 TF using 142,272 cores1
CostUS$ 54M2
RankingTOP500: 6, 2011
PurposePrimarily utilized to perform milestone weapons calculations

Cielo was a United States supercomputer located at Los Alamos National Laboratory.3 Built by Cray Inc, the computer was part of the Advanced Simulation and Computing Program to maintain the United States nuclear stockpile.

From 31 March 2013, with the retirement of IBM Roadrunner, it took over as their front line computer.2 As of June 2014, it is ranked as number 32 on the TOP500. As of 29 September 2016, it has been decommissioned and powered down permanently. Cielo was succeeded by Trinity.

Notes

Notes

  1. "Cielo: NNSA Capability Supercomputer". Los Alamos National Laboratory. Archived from the original on 2014-10-16. Retrieved 2013-04-02.
  2. "'Petaflop' supercomputer is decommissioned". BBC News. 2013-04-01. Retrieved 2013-04-02.
  3. Morgan, Timothy Prickett (1 October 2020). "With "Crossroads" Supercomputer, HPE Notches Another DOE Win". The Next Platform. Retrieved 5 November 2020.
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