The National Energy Research Scientific Computing (NERSC) Center is the mission High Performance Computing facility for the U.S. Department of Energy's (DOE) Office of Science (SC). NERSC provides large-scale, state-of-the-art computing, storage, and networking for more than 7,000 users that encompass the DOE’s unclassified research programs in many science areas. In this talk we will describe the Perlmutter machine which will be delivered to NERSC/LBNL in 2020. Perlmutter will be a pre-exascale machine and contain a mixture of AMD EPYC CPU-only and NVIDIA Tesla GPU-accelerated nodes. In this talk we will describe the architecture of the machine and the analysis we performed in order to optimize this design to meet the needs of the ECP and NERSC user communities.
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