HiPER-P: An Efficient, High-Performance Router for Multicomputer Interconnection Networks

Abstract

As high performance parallel computing architectures make their way into systems with tight size, weight, power, and energy budgets (e.g., portable computing and communications, autonomous vehicles, and space-borne computing), compact and efficient computing and communication mechanisms will be required. To provide such a communication mechanism, the Portable Image Computing Architectures (PICA) group at Georgia Tech is designing the High-Performance Efficient Router (HiPER), a multidimensional router with high-throughput serial channels (1-2 Gbps). Providing high performance for size, weight, power, and energy constrained systems requires careful attention to routing, switching, and error control mechanisms, and the HiPER Prototype (HiPER-P) is a proof-of-concept vehicle that will validate efficient implementations of these mechanisms. The HiPER-P combines mad postman (bit- pipelined) switching with dimension-order routing, producing a router with a very low-latency routing function. To maintain robust communication as link speeds increase and link power budgets decrease, the HiPER-P provides flit-level hop-by-hop retransmission of erroneous flits. This error control mechanism provides built-in error control at the network level. The design of the HiPER-P is presented in this paper as well as results of performance simulations which characterize mad postman switching combined with flit-level error control.