Lassen is similar to the classified Sierra system (same architecture) but smaller in size: ~20 petaFLOP/s peak performance compared to Sierra’s 125 petaFLOP/s peak. The system is designated for unclassified simulation and analysis.
Lassen was part of the contract that brought Sierra to Livermore, and it debuted in 2018 at No. 11 on the TOP500 List, one spot behind LLNL’s Sequoia. Like Vulcan, Lassen is shared by the Multiprogrammatic and Institutional Computing (M&IC) and Advanced Simulation and Computing (ASC) programs.