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Sierra, Livermore’s next advanced technology high performance computing system, will join LLNL’s lineup of supercomputers in 2017-2018. The new system will provide computational resources that are essential for nuclear weapon scientists to fulfill the National Nuclear Security Administration’s stockpile stewardship mission through simulation in lieu of underground testing. Advanced Simulation and Computing (ASC) Program scientists and engineers will use Sierra to assess the performance of nuclear weapon systems as well as nuclear weapon science and engineering calculations. These calculations are necessary to understand key issues of physics, the knowledge of which later makes its way into the integrated design codes. This work on Sierra has important implications for other global and national challenges such as nonproliferation and counterterrorism.

The IBM-built Sierra supercomputer is projected to provide four to six times the sustained performance and five to seven times the workload performance of Sequoia, with a 120–150 petaFLOP/s peak. At ~11 megawatts, Sierra will also be about five times more power efficient than Sequoia. By combining two types of processor chip—IBM’s Power processors and NVIDIA’s Volta graphics processing units—Sierra is designed for more efficient overall operations and is expected to be a promising architecture for extreme-scale computing.

Processor Architecture

IBM Power and NVIDIA Volta processors

Cluster/System Usage

capability parallel computing

Total Memory

2.0-2.4 PB