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PEZY-SC3 is a highly energy- and area-efficient processor for supercomputersdeveloped using TSMC 7nm process technology. It is the third generation of thePEZY-SCx series developed by PEZY Computing, K.K. Supercomputers equipped withthe PEZY-SCx series have been deployed at several research centers and are usedfor large scale scientific calculations.  PEZY-SC3 outperforms previous PEZY-SCx and other processors in terms ofenergy and area efficiency. To achieve high efficiency, PEZY-SC3 employs a MIMDmany-core, fine-grained multithreading, and non-coherent cache, focusing onapplications involving high thread-level parallelism. Our MIMD many-core-basedarchitecture achieves high efficiency while providing higher programmabilitythan existing architectures based on specialized tensor units with limitedfunctionality or wide-SIMD. Another key point of this architecture is toachieve both high efficiency and high throughput without using complex andexpensive units such as out-of-order schedulers. Moreover, our novelnon-coherent and hierarchical cache system enables high scalability onmany-core without compromising programmability.  The energy efficiency of a system equipped with PEZY-SC3 is approximately24.6 GFlops/W, and it ranked 12th in the Green500 (November 2021), whichmeasures the energy efficiency of supercomputers. In terms of processorarchitecture, all the systems ranked higher than the PEZY-SC3 system areequipped with NVIDIA A100 or Preferred Networks MN-Core, and thus PEZY-SC3 isthe third-ranked processor after them. While A100 and MN-Core achieve highenergy efficiency with tensor units specialized for specific functions,PEZY-SC3 does not have such specialized tensor units and thus has higherprogrammability.

PEZY-SC3: A MIMD Many-core Processor for Energy-efficient Computing