The JUMP-1 router chip: a versatile router for supporting a distributed shared memory

JUMP-1 (Japanese Universities MultiProcessor) is currently under development by seven Japanese universities to establish techniques for an efficient distributed shared memory on a massively parallel processor. It provides a coherent cache with a reduced hierarchical bit-map directory scheme to achieve cost-effective and high-performance management. Messages for the coherent cache are transferred through a fat tree on the RDT (recursive diagonal torus) interconnection network. The JUMP-1 router supports versatile functions, including combined multicasting and acknowledgement for the reduced hierarchical bit-map directory scheme.