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Cielo CCC5 Call

ASC Program Links

ASC Headquarters



ASC Sandia

Cielo Project Contacts

Cielo Project Director
Manuel Vigil

Cielo Chief Architect
Doug Doerfler

Cielo Project Manager
Jim Lujan

ACES Codirector
Gary Grider

ACES Codirector
Rob Leland


Cielo supercomputer

astroid mitigation

Cielo on YouTube: A simulation of an asteroid mitigation by LANL's Bob Weaver has had 62,982 views.

Cielo: NNSA Capability Supercomputer

Cielo is a capability-class advanced simulation and computing system. A single calculation can run across all nodes and cores of the machine.

Cielo Facts and Figures

Operational Time Frame:


Theoretical Peak Performance:

1,374 TF

HPL (Linpack) Performance:

1,110 TF using 142,272 cores



# Compute Nodes:


# Compute Cores:


Compute Processor:

Dual AMD Opteron™ 6136 eight-core “Magny-Cours” Socket G34 @ 2.4 GHz

Compute Memory:

286 TB DDR3 @ 1333 MHz

Compute Memory BW:

763 TB/s

Service Nodes:

272 AMD Opteron™ 2427 six-core “Istanbul” Socket F @ 2.2 GHz

External Login Nodes:

Qty 4 Dell PowerEdge R815 Servers

User Disk Storage:

7.6 PB User Available Capacity

Parallel File System:

Cray DVS and Lustre

Parallel File System BW:

~160 GB/s

High Speed Interconnect:

Cray Gemini 3D Torus in a 16 x 12 x 24 (XYZ) Topology

Bi-section BW:

6.57 x 4.38 x 4.38 (XYZ) TB/s

System Footprint:

~3,000 sq ft including Storage

Power Requirement:

3,980 KW running HPL

Operating System:

Cray Linux Environment

The National Nuclear Security Administration (NNSA) Advanced Simulation and Computing (ASC) Program Cielo computing system is the next-generation tri-Lab capability platform beyond the Purple system, which was retired in 2010. Cielo represents a 6x to 10x increase in the classified compute capability for NNSA over its predecessor. Cielo will be used by scientists at three national laboratories: Los Alamos (LANL), Sandia (SNL), and Lawrence Livermore (LLNL), to solve our nation's most demanding stockpile stewardship problems; that is, the large-scale application problems at the edge of our understanding of weapon physics. This fully functional, petascale system serves a diverse scientific and engineering workload. Cielo provides a robust code development and production environment scaled to meet or exceed the workload requirements.

Cielo’s capabilities were designed and developed jointly by LANL and SNL under the Advanced Computing at Extreme Scale (ACES) partnership. The system is physically located at LANL in the Nicholas Metropolis Center for Modeling and Simulation. The facility is designed to scale with the increasingly powerful compute resources to deliver the required end-to-end services for users. Within the center are networking, archival storage, visualization servers, global file systems, and system software, all enhanced to support Cielo’s size and architecture. The ACES partnership is responsible for the support of Cielo, including interactions with the vendor.

*A “flops” is an acronym meaning floating-point operations per second. One petaflop/s is 1,000 trillion operations per second. llion operations per second.






Cielo Resources

Cielo photo (.jpg)

Press Releases

NNSA's Cielo Supercomputer Approved for Classified Operation March 8, 2011

Newest Supercomputer Coming to Los Alamos Apr. 5, 2010

NNSA Selects Cray to Build Next Supercomputing Platform Apr 1, 2010


Cielo Usage Model (updated July 2012) (.pdf)

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA

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