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Lassen: This machine was similar to the classified Sierra system (same architecture) but smaller in size: about 20 petaFLOP/s peak performance compared to Sierra’s 125 petaFLOP/s peak. The system was 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 the recently retired Sequoia.
