Supporting national security through advanced technology
Sequoia LLNL's largest supercomputer


Sequoia is ranked among the world’s most powerful super computers. The system 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 been ranked in the top 4 of the Graph500 and Green500 lists since 2012, indicating that it is one of the most efficient systems in the world for processing extremely vast (petabyte and exabyte-size) data sets. The Graph500 benchmark measures how quickly a system can search through a large data set. This is 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. The Green500 list ranks supercomputers by energy efficiency, comparing performance-per-watt of each system. Sequoia’s Linpack performance is 17,173.2 teraFLOPs 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