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Ranked among the world’s most powerful supercomputers, Sequoia supports two missions: quantify the uncertainties in numerical simulations of nuclear weapons performance and perform the advanced weapons science calculations needed to develop the accurate physics-based models for weapons codes. Sequoia is primarily water-cooled and significantly more energy efficient than comparable systems, which is essential to control operating costs.

Sequoia has prevailed at No. 1 on the Graph500 list since November 2012, indicating that it is still the world’s most efficient at processing extremely vast (petabyte and exabyte-size) data sets. The Graph500 benchmark measures how quickly a system can search through a large data set—an important indicator of a system’s usefulness as computer scientists increasingly use supercomputers to analyze massive data-intensive workloads in addition to executing traditional modeling and simulation tasks. Sequoia traversed 15,363 billion edges per second.

Processor Architecture

Power7, PowerPC A2 (IBM)

Operating System

RHEL (login) CNK (compute)

Cluster/System Usage

capability parallel computing

Processor Clock Rate/Process Clock Speed

3.7 GHz (login) 1.6 GHz (compute)



Cores per Node

48 (login, Power7); 16 (compute, PPC A2)

Total Cores

1,572,864 compute cores

Memory per Node

64 GB (login); 16 GB (compute)

Total Memory

1.6 PB compute memory