COOL MULTITHREADING IN HTMT SPELL-1 PROCESSORS

摘要

A COOl.-l multiprocessor shared memory system based on superconductor Rapid Single-Flux Quantum (RSFQ) technology is being developed at SUNY (Stony Brook, USA) within the framework of the Hybrid Technology Multithreaded architecture (HTMT) petaflops project led by JIM. This paper describes a multithreading approach proposed in the COOL-I architecture and mechanisms to exploit the thread level parallelism in RSFQ processors called SPELL-1. Up to 128 fine-grain threads called (instruction) streams arranged in 16 groups of 8 streams each can run in paiallel within a SPF'LL-1 processor. All eight streams comprising each COOL stream cluster can communicate and synchronize directly via shared registers. Fast creation and termination of streams including speculative stream execution are also supported.